From 6f06df04f0907cfae90a766ec99a6cf7924ea7a1 Mon Sep 17 00:00:00 2001
From: Mark Pedrotti <pedrottimark@gmail.com>
Date: Wed, 10 Apr 2019 17:08:43 -0400
Subject: [PATCH 1/3] expect: Improve report when matcher fails, part 16

---
 .../__snapshots__/failures.test.ts.snap       |  10 +-
 .../__snapshots__/extend.test.js.snap         |  16 +-
 .../__snapshots__/matchers.test.js.snap       | 466 ++++++++----------
 packages/expect/src/matchers.ts               |  95 ++--
 packages/expect/src/print.ts                  |  59 +++
 .../__snapshots__/index.test.ts.snap          |   4 +-
 6 files changed, 312 insertions(+), 338 deletions(-)

diff --git a/e2e/__tests__/__snapshots__/failures.test.ts.snap b/e2e/__tests__/__snapshots__/failures.test.ts.snap
index 39f7e80eb37d..dad936e44a6f 100644
--- a/e2e/__tests__/__snapshots__/failures.test.ts.snap
+++ b/e2e/__tests__/__snapshots__/failures.test.ts.snap
@@ -260,7 +260,7 @@ FAIL __tests__/testMacro.test.js
 
   ● use some imported macro to make assertion
 
-    expect(received).toEqual(expected)
+    expect(received).toEqual(expected) // deep equality
 
     Expected: 2
     Received: 1
@@ -286,9 +286,7 @@ FAIL __tests__/asyncFailures.test.js
 
   ● resolve, but fail
 
-    expect(received).toEqual(expected)
-
-    Difference:
+    expect(received).resolves.toEqual(expected) // deep equality
 
     - Expected
     + Received
@@ -310,9 +308,7 @@ FAIL __tests__/asyncFailures.test.js
 
   ● reject, but fail
 
-    expect(received).toEqual(expected)
-
-    Difference:
+    expect(received).rejects.toEqual(expected) // deep equality
 
     - Expected
     + Received
diff --git a/packages/expect/src/__tests__/__snapshots__/extend.test.js.snap b/packages/expect/src/__tests__/__snapshots__/extend.test.js.snap
index fa8c8daae7bc..4705aef06b68 100644
--- a/packages/expect/src/__tests__/__snapshots__/extend.test.js.snap
+++ b/packages/expect/src/__tests__/__snapshots__/extend.test.js.snap
@@ -1,9 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`defines asymmetric unary matchers 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -15,9 +13,7 @@ Difference:
 `;
 
 exports[`defines asymmetric unary matchers that can be prefixed by not 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -29,9 +25,7 @@ Difference:
 `;
 
 exports[`defines asymmetric variadic matchers 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -43,9 +37,7 @@ Difference:
 `;
 
 exports[`defines asymmetric variadic matchers that can be prefixed by not 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
diff --git a/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap b/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
index 196f8238cc5b..a33c04d9431b 100644
--- a/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
+++ b/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
@@ -325,7 +325,7 @@ exports[`.toBe() fails for: [] and [] 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>[]</>
-Received value has no visual difference"
+Received: has same serialization"
 `;
 
 exports[`.toBe() fails for: [Error: received] and [Error: expected] 1`] = `
@@ -339,7 +339,7 @@ exports[`.toBe() fails for: [Function anonymous] and [Function anonymous] 1`] =
 "<dim>expect(</><red>received</><dim>).</>toBe<dim>(</><green>expected</><dim>) // Object.is equality</>
 
 Expected: <green>[Function anonymous]</>
-Received value has no visual difference"
+Received: has same serialization"
 `;
 
 exports[`.toBe() fails for: {"a": [Function a], "b": 2} and {"a": Any<Function>, "b": 2} 1`] = `
@@ -363,7 +363,7 @@ exports[`.toBe() fails for: {"a": 1} and {"a": 1} 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>{\\"a\\": 1}</>
-Received value has no visual difference"
+Received: has same serialization"
 `;
 
 exports[`.toBe() fails for: {"a": 1} and {"a": 5} 1`] = `
@@ -398,7 +398,7 @@ exports[`.toBe() fails for: {} and {} 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>{}</>
-Received value has no visual difference"
+Received: has same serialization"
 `;
 
 exports[`.toBe() fails for: -0 and 0 1`] = `
@@ -421,7 +421,7 @@ exports[`.toBe() fails for: 2020-02-20T00:00:00.000Z and 2020-02-20T00:00:00.000
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>2020-02-20T00:00:00.000Z</>
-Received value has no visual difference"
+Received: has same serialization"
 `;
 
 exports[`.toBe() fails for: 2020-02-21T00:00:00.000Z and 2020-02-20T00:00:00.000Z 1`] = `
@@ -1892,42 +1892,35 @@ Received has value: <red>null</>"
 `;
 
 exports[`.toEqual() {pass: false} expect("Eve").toEqual({"asymmetricMatch": [Function asymmetricMatch]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>{\\"asymmetricMatch\\": [Function asymmetricMatch]}</>
 Received: <red>\\"Eve\\"</>"
 `;
 
 exports[`.toEqual() {pass: false} expect("abd").toEqual(StringContaining "bc") 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>StringContaining \\"bc\\"</>
 Received: <red>\\"abd\\"</>"
 `;
 
 exports[`.toEqual() {pass: false} expect("abd").toEqual(StringMatching /bc/i) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>StringMatching /bc/i</>
 Received: <red>\\"abd\\"</>"
 `;
 
 exports[`.toEqual() {pass: false} expect("banana").toEqual("apple") 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Difference:
-
-<green>- Expected</>
-<red>+ Received</>
-
-<green>- apple</>
-<red>+ banana</>"
+Expected: <green>\\"apple\\"</>
+Received: <red>\\"banana\\"</>"
 `;
 
 exports[`.toEqual() {pass: false} expect([1, 2]).toEqual([2, 1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -1940,25 +1933,14 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect([1, 3]).toEqual(ArrayContaining [1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Difference:
-
-<green>- Expected</>
-<red>+ Received</>
-
-<green>- ArrayContaining [</>
-<red>+ Array [</>
-<dim>    1,</>
-<green>-   2,</>
-<red>+   3,</>
-<dim>  ]</>"
+Expected: <green>ArrayContaining [1, 2]</>
+Received: <red>[1, 3]</>"
 `;
 
 exports[`.toEqual() {pass: false} expect([1]).toEqual([2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -1970,9 +1952,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect({"a": 1, "b": 2}).toEqual(ObjectContaining {"a": 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -1986,9 +1966,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect({"a": 1}).toEqual({"a": 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2000,9 +1978,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect({"a": 5}).toEqual({"b": 6}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2014,9 +1990,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect({"nodeName": "div", "nodeType": 1}).toEqual({"nodeName": "p", "nodeType": 1}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2029,9 +2003,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect({"target": {"nodeType": 1, "value": "a"}}).toEqual({"target": {"nodeType": 1, "value": "b"}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2046,44 +2018,42 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(0).toEqual(-0) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>-0</>
 Received: <red>0</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(0).toEqual(5e-324) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>5e-324</>
 Received: <red>0</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(1).toEqual(2) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>2</>
 Received: <red>1</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(1).toEqual(ArrayContaining [1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>ArrayContaining [1, 2]</>
 Received: <red>1</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(5e-324).toEqual(0) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>0</>
 Received: <red>5e-324</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.List [1, 2]).toEqual(Immutable.List [2, 1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2096,9 +2066,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.List [1]).toEqual(Immutable.List [2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2110,9 +2078,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.Map {"1": Immutable.Map {"2": {"a": 99}}}).toEqual(Immutable.Map {"1": Immutable.Map {"2": {"a": 11}}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2128,9 +2094,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.Map {"a": 0}).toEqual(Immutable.Map {"b": 0}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2142,9 +2106,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.Map {"v": 1}).toEqual(Immutable.Map {"v": 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2156,9 +2118,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.OrderedMap {1: "one", 2: "two"}).toEqual(Immutable.OrderedMap {2: "two", 1: "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2171,9 +2131,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.OrderedSet [1, 2]).toEqual(Immutable.OrderedSet [2, 1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2186,9 +2144,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.Set [1, 2]).toEqual(Immutable.Set []) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2201,9 +2157,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Immutable.Set [1, 2]).toEqual(Immutable.Set [1, 2, 3]) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2216,9 +2170,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {"a" => 0}).toEqual(Map {"b" => 0}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2230,9 +2182,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {"v" => 1}).toEqual(Map {"v" => 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2244,9 +2194,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {["v"] => 1}).toEqual(Map {["v"] => 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2260,9 +2208,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {[1] => Map {[1] => "one"}}).toEqual(Map {[1] => Map {[1] => "two"}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2280,16 +2226,14 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {}).toEqual(Set {}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>Set {}</>
 Received: <red>Map {}</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(Map {1 => "one", 2 => "two"}).toEqual(Map {1 => "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2301,9 +2245,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Set {[1], [2]}).toEqual(Set {[1], [2], [2]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2321,9 +2263,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Set {[1], [2]}).toEqual(Set {[1], [2], [3]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2341,9 +2281,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Set {1, 2}).toEqual(Set {}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2356,9 +2294,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Set {1, 2}).toEqual(Set {1, 2, 3}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2371,9 +2307,7 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(Set {Set {1}, Set {2}}).toEqual(Set {Set {1}, Set {3}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -2390,374 +2324,374 @@ Difference:
 `;
 
 exports[`.toEqual() {pass: false} expect(false).toEqual(ObjectContaining {"a": 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>ObjectContaining {\\"a\\": 2}</>
 Received: <red>false</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(null).toEqual(undefined) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>undefined</>
 Received: <red>null</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(true).toEqual(false) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>false</>
 Received: <red>true</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(undefined).toEqual(Any<Function>) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>Any<Function></>
 Received: <red>undefined</>"
 `;
 
 exports[`.toEqual() {pass: false} expect(undefined).toEqual(Anything) 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 Expected: <green>Anything</>
 Received: <red>undefined</>"
 `;
 
 exports[`.toEqual() {pass: true} expect("Alice").not.toEqual({"asymmetricMatch": [Function asymmetricMatch]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"asymmetricMatch\\": [Function asymmetricMatch]}</>
-Received: <red>\\"Alice\\"</>"
+Expected: not <green>{\\"asymmetricMatch\\": [Function asymmetricMatch]}</>
+Received:     <red>\\"Alice\\"</>"
 `;
 
 exports[`.toEqual() {pass: true} expect("abc").not.toEqual("abc") 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>\\"abc\\"</>
-Received: <red>\\"abc\\"</>"
+Expected: not <green>\\"abc\\"</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect("abc").not.toEqual({"0": "a", "1": "b", "2": "c"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"0\\": \\"a\\", \\"1\\": \\"b\\", \\"2\\": \\"c\\"}</>
-Received: <red>\\"abc\\"</>"
+Expected: not <green>{\\"0\\": \\"a\\", \\"1\\": \\"b\\", \\"2\\": \\"c\\"}</>
+Received:     <red>\\"abc\\"</>"
 `;
 
 exports[`.toEqual() {pass: true} expect("abcd").not.toEqual(StringContaining "bc") 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>StringContaining \\"bc\\"</>
-Received: <red>\\"abcd\\"</>"
+Expected: not <green>StringContaining \\"bc\\"</>
+Received:     <red>\\"abcd\\"</>"
 `;
 
 exports[`.toEqual() {pass: true} expect("abcd").not.toEqual(StringMatching /bc/) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>StringMatching /bc/</>
-Received: <red>\\"abcd\\"</>"
+Expected: not <green>StringMatching /bc/</>
+Received:     <red>\\"abcd\\"</>"
 `;
 
 exports[`.toEqual() {pass: true} expect([1, 2, 3]).not.toEqual(ArrayContaining [2, 3]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>ArrayContaining [2, 3]</>
-Received: <red>[1, 2, 3]</>"
+Expected: not <green>ArrayContaining [2, 3]</>
+Received:     <red>[1, 2, 3]</>"
 `;
 
 exports[`.toEqual() {pass: true} expect([1, 2]).not.toEqual([1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>[1, 2]</>
-Received: <red>[1, 2]</>"
+Expected: not <green>[1, 2]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect([1]).not.toEqual([1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>[1]</>
-Received: <red>[1]</>"
+Expected: not <green>[1]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect([Function anonymous]).not.toEqual(Any<Function>) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Any<Function></>
-Received: <red>[Function anonymous]</>"
+Expected: not <green>Any<Function></>
+Received:     <red>[Function anonymous]</>"
 `;
 
 exports[`.toEqual() {pass: true} expect({"0": "a", "1": "b", "2": "c"}).not.toEqual("abc") 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>\\"abc\\"</>
-Received: <red>{\\"0\\": \\"a\\", \\"1\\": \\"b\\", \\"2\\": \\"c\\"}</>"
+Expected: not <green>\\"abc\\"</>
+Received:     <red>{\\"0\\": \\"a\\", \\"1\\": \\"b\\", \\"2\\": \\"c\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect({"a": 1, "b": [Function b], "c": true}).not.toEqual({"a": 1, "b": Any<Function>, "c": Anything}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"a\\": 1, \\"b\\": Any<Function>, \\"c\\": Anything}</>
-Received: <red>{\\"a\\": 1, \\"b\\": [Function b], \\"c\\": true}</>"
+Expected: not <green>{\\"a\\": 1, \\"b\\": Any<Function>, \\"c\\": Anything}</>
+Received:     <red>{\\"a\\": 1, \\"b\\": [Function b], \\"c\\": true}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect({"a": 1, "b": 2}).not.toEqual(ObjectContaining {"a": 1}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>ObjectContaining {\\"a\\": 1}</>
-Received: <red>{\\"a\\": 1, \\"b\\": 2}</>"
+Expected: not <green>ObjectContaining {\\"a\\": 1}</>
+Received:     <red>{\\"a\\": 1, \\"b\\": 2}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect({"a": 99}).not.toEqual({"a": 99}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"a\\": 99}</>
-Received: <red>{\\"a\\": 99}</>"
+Expected: not <green>{\\"a\\": 99}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect({"nodeName": "div", "nodeType": 1}).not.toEqual({"nodeName": "div", "nodeType": 1}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"nodeName\\": \\"div\\", \\"nodeType\\": 1}</>
-Received: <red>{\\"nodeName\\": \\"div\\", \\"nodeType\\": 1}</>"
+Expected: not <green>{\\"nodeName\\": \\"div\\", \\"nodeType\\": 1}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect({}).not.toEqual({}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{}</>
-Received: <red>{}</>"
+Expected: not <green>{}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect({}).not.toEqual(0) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>0</>
-Received: <red>{}</>"
+Expected: not <green>0</>
+Received:     <red>{}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(0).not.toEqual({}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{}</>
-Received: <red>0</>"
+Expected: not <green>{}</>
+Received:     <red>0</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(1).not.toEqual(1) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>1</>
-Received: <red>1</>"
+Expected: not <green>1</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.List [1, 2]).not.toEqual(Immutable.List [1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.List [1, 2]</>
-Received: <red>Immutable.List [1, 2]</>"
+Expected: not <green>Immutable.List [1, 2]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.List [1]).not.toEqual(Immutable.List [1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.List [1]</>
-Received: <red>Immutable.List [1]</>"
+Expected: not <green>Immutable.List [1]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Map {"1": Immutable.Map {"2": {"a": 99}}}).not.toEqual(Immutable.Map {"1": Immutable.Map {"2": {"a": 99}}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Map {\\"1\\": Immutable.Map {\\"2\\": {\\"a\\": 99}}}</>
-Received: <red>Immutable.Map {\\"1\\": Immutable.Map {\\"2\\": {\\"a\\": 99}}}</>"
+Expected: not <green>Immutable.Map {\\"1\\": Immutable.Map {\\"2\\": {\\"a\\": 99}}}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Map {}).not.toEqual(Immutable.Map {}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Map {}</>
-Received: <red>Immutable.Map {}</>"
+Expected: not <green>Immutable.Map {}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Map {1: "one", 2: "two"}).not.toEqual(Immutable.Map {1: "one", 2: "two"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Map {1: \\"one\\", 2: \\"two\\"}</>
-Received: <red>Immutable.Map {1: \\"one\\", 2: \\"two\\"}</>"
+Expected: not <green>Immutable.Map {1: \\"one\\", 2: \\"two\\"}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Map {1: "one", 2: "two"}).not.toEqual(Immutable.Map {2: "two", 1: "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Map {2: \\"two\\", 1: \\"one\\"}</>
-Received: <red>Immutable.Map {1: \\"one\\", 2: \\"two\\"}</>"
+Expected: not <green>Immutable.Map {2: \\"two\\", 1: \\"one\\"}</>
+Received:     <red>Immutable.Map {1: \\"one\\", 2: \\"two\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.OrderedMap {1: "one", 2: "two"}).not.toEqual(Immutable.OrderedMap {1: "one", 2: "two"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.OrderedMap {1: \\"one\\", 2: \\"two\\"}</>
-Received: <red>Immutable.OrderedMap {1: \\"one\\", 2: \\"two\\"}</>"
+Expected: not <green>Immutable.OrderedMap {1: \\"one\\", 2: \\"two\\"}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.OrderedSet []).not.toEqual(Immutable.OrderedSet []) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.OrderedSet []</>
-Received: <red>Immutable.OrderedSet []</>"
+Expected: not <green>Immutable.OrderedSet []</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.OrderedSet [1, 2]).not.toEqual(Immutable.OrderedSet [1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.OrderedSet [1, 2]</>
-Received: <red>Immutable.OrderedSet [1, 2]</>"
+Expected: not <green>Immutable.OrderedSet [1, 2]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Set []).not.toEqual(Immutable.Set []) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Set []</>
-Received: <red>Immutable.Set []</>"
+Expected: not <green>Immutable.Set []</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Set [1, 2]).not.toEqual(Immutable.Set [1, 2]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Set [1, 2]</>
-Received: <red>Immutable.Set [1, 2]</>"
+Expected: not <green>Immutable.Set [1, 2]</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Immutable.Set [1, 2]).not.toEqual(Immutable.Set [2, 1]) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Immutable.Set [2, 1]</>
-Received: <red>Immutable.Set [1, 2]</>"
+Expected: not <green>Immutable.Set [2, 1]</>
+Received:     <red>Immutable.Set [1, 2]</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {[1] => "one", [2] => "two", [3] => "three", [3] => "four"}).not.toEqual(Map {[3] => "three", [3] => "four", [2] => "two", [1] => "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {[3] => \\"three\\", [3] => \\"four\\", [2] => \\"two\\", [1] => \\"one\\"}</>
-Received: <red>Map {[1] => \\"one\\", [2] => \\"two\\", [3] => \\"three\\", [3] => \\"four\\"}</>"
+Expected: not <green>Map {[3] => \\"three\\", [3] => \\"four\\", [2] => \\"two\\", [1] => \\"one\\"}</>
+Received:     <red>Map {[1] => \\"one\\", [2] => \\"two\\", [3] => \\"three\\", [3] => \\"four\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {[1] => "one", [2] => "two"}).not.toEqual(Map {[2] => "two", [1] => "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {[2] => \\"two\\", [1] => \\"one\\"}</>
-Received: <red>Map {[1] => \\"one\\", [2] => \\"two\\"}</>"
+Expected: not <green>Map {[2] => \\"two\\", [1] => \\"one\\"}</>
+Received:     <red>Map {[1] => \\"one\\", [2] => \\"two\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {[1] => Map {[1] => "one"}, [2] => Map {[2] => "two"}}).not.toEqual(Map {[2] => Map {[2] => "two"}, [1] => Map {[1] => "one"}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {[2] => Map {[2] => \\"two\\"}, [1] => Map {[1] => \\"one\\"}}</>
-Received: <red>Map {[1] => Map {[1] => \\"one\\"}, [2] => Map {[2] => \\"two\\"}}</>"
+Expected: not <green>Map {[2] => Map {[2] => \\"two\\"}, [1] => Map {[1] => \\"one\\"}}</>
+Received:     <red>Map {[1] => Map {[1] => \\"one\\"}, [2] => Map {[2] => \\"two\\"}}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {{"a": 1} => "one", {"b": 2} => "two"}).not.toEqual(Map {{"b": 2} => "two", {"a": 1} => "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {{\\"b\\": 2} => \\"two\\", {\\"a\\": 1} => \\"one\\"}</>
-Received: <red>Map {{\\"a\\": 1} => \\"one\\", {\\"b\\": 2} => \\"two\\"}</>"
+Expected: not <green>Map {{\\"b\\": 2} => \\"two\\", {\\"a\\": 1} => \\"one\\"}</>
+Received:     <red>Map {{\\"a\\": 1} => \\"one\\", {\\"b\\": 2} => \\"two\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {}).not.toEqual(Map {}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {}</>
-Received: <red>Map {}</>"
+Expected: not <green>Map {}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {1 => "one", 2 => "two"}).not.toEqual(Map {1 => "one", 2 => "two"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {1 => \\"one\\", 2 => \\"two\\"}</>
-Received: <red>Map {1 => \\"one\\", 2 => \\"two\\"}</>"
+Expected: not <green>Map {1 => \\"one\\", 2 => \\"two\\"}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {1 => "one", 2 => "two"}).not.toEqual(Map {2 => "two", 1 => "one"}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {2 => \\"two\\", 1 => \\"one\\"}</>
-Received: <red>Map {1 => \\"one\\", 2 => \\"two\\"}</>"
+Expected: not <green>Map {2 => \\"two\\", 1 => \\"one\\"}</>
+Received:     <red>Map {1 => \\"one\\", 2 => \\"two\\"}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Map {1 => ["one"], 2 => ["two"]}).not.toEqual(Map {2 => ["two"], 1 => ["one"]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Map {2 => [\\"two\\"], 1 => [\\"one\\"]}</>
-Received: <red>Map {1 => [\\"one\\"], 2 => [\\"two\\"]}</>"
+Expected: not <green>Map {2 => [\\"two\\"], 1 => [\\"one\\"]}</>
+Received:     <red>Map {1 => [\\"one\\"], 2 => [\\"two\\"]}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(NaN).not.toEqual(NaN) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>NaN</>
-Received: <red>NaN</>"
+Expected: not <green>NaN</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {[1], [2], [3], [3]}).not.toEqual(Set {[3], [3], [2], [1]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {[3], [3], [2], [1]}</>
-Received: <red>Set {[1], [2], [3], [3]}</>"
+Expected: not <green>Set {[3], [3], [2], [1]}</>
+Received:     <red>Set {[1], [2], [3], [3]}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {[1], [2]}).not.toEqual(Set {[2], [1]}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {[2], [1]}</>
-Received: <red>Set {[1], [2]}</>"
+Expected: not <green>Set {[2], [1]}</>
+Received:     <red>Set {[1], [2]}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {{"a": 1}, {"b": 2}}).not.toEqual(Set {{"b": 2}, {"a": 1}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {{\\"b\\": 2}, {\\"a\\": 1}}</>
-Received: <red>Set {{\\"a\\": 1}, {\\"b\\": 2}}</>"
+Expected: not <green>Set {{\\"b\\": 2}, {\\"a\\": 1}}</>
+Received:     <red>Set {{\\"a\\": 1}, {\\"b\\": 2}}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {}).not.toEqual(Set {}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {}</>
-Received: <red>Set {}</>"
+Expected: not <green>Set {}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {1, 2}).not.toEqual(Set {1, 2}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {1, 2}</>
-Received: <red>Set {1, 2}</>"
+Expected: not <green>Set {1, 2}</>
+"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {1, 2}).not.toEqual(Set {2, 1}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {2, 1}</>
-Received: <red>Set {1, 2}</>"
+Expected: not <green>Set {2, 1}</>
+Received:     <red>Set {1, 2}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(Set {Set {[1]}, Set {[2]}}).not.toEqual(Set {Set {[2]}, Set {[1]}}) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Set {Set {[2]}, Set {[1]}}</>
-Received: <red>Set {Set {[1]}, Set {[2]}}</>"
+Expected: not <green>Set {Set {[2]}, Set {[1]}}</>
+Received:     <red>Set {Set {[1]}, Set {[2]}}</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(true).not.toEqual(Anything) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>Anything</>
-Received: <red>true</>"
+Expected: not <green>Anything</>
+Received:     <red>true</>"
 `;
 
 exports[`.toEqual() {pass: true} expect(true).not.toEqual(true) 1`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>true</>
-Received: <red>true</>"
+Expected: not <green>true</>
+"
 `;
 
 exports[`.toHaveLength {pass: false} expect("").toHaveLength(1) 1`] = `
@@ -3659,9 +3593,7 @@ Received string:    <red>\\"bar\\"</>"
 `;
 
 exports[`.toStrictEqual() matches the expected snapshot when it fails 1`] = `
-"<dim>expect(</><red>received</><dim>).toStrictEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toStrictEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>
@@ -3676,10 +3608,10 @@ Difference:
 `;
 
 exports[`.toStrictEqual() matches the expected snapshot when it fails 2`] = `
-"<dim>expect(</><red>received</><dim>).</>not<dim>.toStrictEqual(</><green>expected</><dim>)</>
+"<dim>expect(</><red>received</><dim>).</>not<dim>.</>toStrictEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
-Expected: <green>{\\"test\\": {\\"a\\": 1, \\"b\\": 2}}</>
-Received: <red>{\\"test\\": {\\"a\\": 1, \\"b\\": 2}}</>"
+Expected: not <green>{\\"test\\": {\\"a\\": 1, \\"b\\": 2}}</>
+"
 `;
 
 exports[`toMatchObject() {pass: false} expect([0]).toMatchObject([-0]) 1`] = `
diff --git a/packages/expect/src/matchers.ts b/packages/expect/src/matchers.ts
index 405b479330cc..a26fe2a7ebbe 100644
--- a/packages/expect/src/matchers.ts
+++ b/packages/expect/src/matchers.ts
@@ -27,6 +27,7 @@ import {
 } from 'jest-matcher-utils';
 import {MatchersObject, MatcherState} from './types';
 import {
+  printDiffOrStringify,
   printReceivedArrayContainExpectedItem,
   printReceivedStringContainExpectedResult,
   printReceivedStringContainExpectedSubstring,
@@ -38,10 +39,13 @@ import {
   sparseArrayEquality,
   subsetEquality,
   typeEquality,
-  isOneline,
 } from './utils';
 import {equals} from './jasmineUtils';
 
+// Include colon and one or more spaces, same as returned by getLabelPrinter.
+const EXPECTED_LABEL = 'Expected: ';
+const RECEIVED_LABEL = 'Received: ';
+
 const toStrictEqualTesters = [
   iterableEquality,
   typeEquality,
@@ -72,7 +76,6 @@ const matchers: MatchersObject = {
           '\n\n' +
           `Expected: not ${printExpected(expected)}`
       : () => {
-          const receivedType = getType(received);
           const expectedType = getType(expected);
 
           let deepEqualityName = null;
@@ -86,20 +89,6 @@ const matchers: MatchersObject = {
             }
           }
 
-          const hasConciseReport =
-            receivedType !== expectedType ||
-            (isPrimitive(expected) &&
-              (expectedType !== 'string' || isOneline(expected, received))) ||
-            expectedType === 'date' ||
-            expectedType === 'function' ||
-            expectedType === 'regexp' ||
-            (received instanceof Error && expected instanceof Error);
-          const hasDifference = stringify(expected) !== stringify(received);
-          const difference =
-            !hasConciseReport && hasDifference
-              ? diff(expected, received, {expand: this.expand}) // string | null
-              : null;
-
           return (
             matcherHint(matcherName, undefined, undefined, options) +
             '\n\n' +
@@ -108,12 +97,13 @@ const matchers: MatchersObject = {
                   `If it should pass with deep equality, replace "${matcherName}" with "${deepEqualityName}"`,
                 ) + '\n\n'
               : '') +
-            (difference !== null
-              ? difference
-              : `Expected: ${printExpected(expected)}\n` +
-                (hasDifference
-                  ? `Received: ${printReceived(received)}`
-                  : 'Received value has no visual difference'))
+            printDiffOrStringify(
+              expected,
+              received,
+              EXPECTED_LABEL,
+              RECEIVED_LABEL,
+              this.expand,
+            )
           );
         };
 
@@ -569,9 +559,11 @@ const matchers: MatchersObject = {
   },
 
   toEqual(this: MatcherState, received: unknown, expected: unknown) {
-    const matcherName = '.toEqual';
+    const matcherName = 'toEqual';
     const options: MatcherHintOptions = {
+      comment: 'deep equality',
       isNot: this.isNot,
+      promise: this.promise,
     };
 
     const pass = equals(received, expected, [iterableEquality]);
@@ -580,25 +572,25 @@ const matchers: MatchersObject = {
       ? () =>
           matcherHint(matcherName, undefined, undefined, options) +
           '\n\n' +
-          `Expected: ${printExpected(expected)}\n` +
-          `Received: ${printReceived(received)}`
-      : () => {
-          const difference = diff(expected, received, {expand: this.expand});
-
-          return (
-            matcherHint(matcherName, undefined, undefined, options) +
-            '\n\n' +
-            (difference && difference.includes('- Expect')
-              ? `Difference:\n\n${difference}`
-              : `Expected: ${printExpected(expected)}\n` +
-                `Received: ${printReceived(received)}`)
+          `Expected: not ${printExpected(expected)}\n` +
+          (stringify(expected) !== stringify(received)
+            ? `Received:     ${printReceived(received)}`
+            : '')
+      : () =>
+          matcherHint(matcherName, undefined, undefined, options) +
+          '\n\n' +
+          printDiffOrStringify(
+            expected,
+            received,
+            EXPECTED_LABEL,
+            RECEIVED_LABEL,
+            this.expand,
           );
-        };
 
     // Passing the actual and expected objects so that a custom reporter
     // could access them, for example in order to display a custom visual diff,
     // or create a different error message
-    return {actual: received, expected, message, name: 'toEqual', pass};
+    return {actual: received, expected, message, name: matcherName, pass};
   },
 
   toHaveLength(this: MatcherState, received: any, expected: number) {
@@ -884,9 +876,11 @@ const matchers: MatchersObject = {
   },
 
   toStrictEqual(this: MatcherState, received: unknown, expected: unknown) {
-    const matcherName = '.toStrictEqual';
+    const matcherName = 'toStrictEqual';
     const options: MatcherHintOptions = {
+      comment: 'deep equality',
       isNot: this.isNot,
+      promise: this.promise,
     };
 
     const pass = equals(received, expected, toStrictEqualTesters, true);
@@ -895,22 +889,25 @@ const matchers: MatchersObject = {
       ? () =>
           matcherHint(matcherName, undefined, undefined, options) +
           '\n\n' +
-          `Expected: ${printExpected(expected)}\n` +
-          `Received: ${printReceived(received)}`
-      : () => {
-          const difference = diff(expected, received, {
-            expand: this.expand,
-          });
-          return (
-            matcherHint(matcherName, undefined, undefined, options) +
-            (difference ? `\n\nDifference:\n\n${difference}` : '')
+          `Expected: not ${printExpected(expected)}\n` +
+          (stringify(expected) !== stringify(received)
+            ? `Received:     ${printReceived(received)}`
+            : '')
+      : () =>
+          matcherHint(matcherName, undefined, undefined, options) +
+          '\n\n' +
+          printDiffOrStringify(
+            expected,
+            received,
+            EXPECTED_LABEL,
+            RECEIVED_LABEL,
+            this.expand,
           );
-        };
 
     // Passing the actual and expected objects so that a custom reporter
     // could access them, for example in order to display a custom visual diff,
     // or create a different error message
-    return {actual: received, expected, message, name: 'toStrictEqual', pass};
+    return {actual: received, expected, message, name: matcherName, pass};
   },
 };
 
diff --git a/packages/expect/src/print.ts b/packages/expect/src/print.ts
index a8c50038a225..cf8a17bc422e 100644
--- a/packages/expect/src/print.ts
+++ b/packages/expect/src/print.ts
@@ -6,12 +6,16 @@
  *
  */
 
+import getType, {isPrimitive} from 'jest-get-type';
 import {
   INVERTED_COLOR,
   RECEIVED_COLOR,
+  diff,
+  printExpected,
   printReceived,
   stringify,
 } from 'jest-matcher-utils';
+import {isOneline} from './utils';
 
 // Format substring but do not enclose in double quote marks.
 // The replacement is compatible with pretty-format package.
@@ -59,3 +63,58 @@ export const printReceivedArrayContainExpectedItem = (
         .join(', ') +
       ']',
   );
+
+const shouldPrintDiff = (expected: unknown, received: unknown): boolean => {
+  const expectedType = getType(expected);
+  const receivedType = getType(received);
+
+  if (expectedType !== receivedType) {
+    return false;
+  }
+
+  if (isPrimitive(expected)) {
+    // Print diff only if both strings have more than one line.
+    return expectedType === 'string' && !isOneline(expected, received);
+  }
+
+  if (
+    expectedType === 'date' ||
+    expectedType === 'function' ||
+    expectedType === 'regexp'
+  ) {
+    return false;
+  }
+
+  if (expected instanceof Error && received instanceof Error) {
+    return false;
+  }
+
+  return true;
+};
+
+export const printDiffOrStringify = (
+  expected: unknown,
+  received: unknown,
+  expectedLabel: string, // include colon and one or more spaces,
+  receivedLabel: string, // same as returned by getLabelPrinter
+  expand?: boolean, // diff option: true if `--expand` CLI option
+): string => {
+  // Cannot use same serialization as shortcut to avoid diff,
+  // because stringify (that is, pretty-format with min option)
+  // omits constructor name for array or object, too bad so sad :(
+  const difference = shouldPrintDiff(expected, received)
+    ? diff(expected, received, {expand}) // string | null
+    : null;
+
+  // Cannot reuse value of stringify(received) in report string,
+  // because printReceived does inverse highlight space at end of line,
+  // but RECEIVED_COLOR does not (it refers to a plain chalk method).
+  return typeof difference === 'string' && difference.includes('- Expected')
+    ? difference
+    : `${expectedLabel}${printExpected(expected)}\n` +
+        `${receivedLabel}${
+          stringify(expected) === stringify(received)
+            ? 'has same serialization'
+            : printReceived(received)
+        }`;
+};
diff --git a/packages/jest-matcher-utils/src/__tests__/__snapshots__/index.test.ts.snap b/packages/jest-matcher-utils/src/__tests__/__snapshots__/index.test.ts.snap
index 208598d4c2f2..b495afe03d41 100644
--- a/packages/jest-matcher-utils/src/__tests__/__snapshots__/index.test.ts.snap
+++ b/packages/jest-matcher-utils/src/__tests__/__snapshots__/index.test.ts.snap
@@ -93,9 +93,7 @@ exports[`.stringify() reduces maxDepth if stringifying very large objects 1`] =
 exports[`.stringify() reduces maxDepth if stringifying very large objects 2`] = `"{\\"a\\": 1, \\"b\\": {\\"0\\": \\"test\\", \\"1\\": \\"test\\", \\"2\\": \\"test\\", \\"3\\": \\"test\\", \\"4\\": \\"test\\", \\"5\\": \\"test\\", \\"6\\": \\"test\\", \\"7\\": \\"test\\", \\"8\\": \\"test\\", \\"9\\": \\"test\\"}}"`;
 
 exports[`.stringify() toJSON errors when comparing two objects 1`] = `
-"<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
-
-Difference:
+"<dim>expect(</><red>received</><dim>).</>toEqual<dim>(</><green>expected</><dim>) // deep equality</>
 
 <green>- Expected</>
 <red>+ Received</>

From 699d377d9bf78b310facf9b0d5f5ee49f34d66f2 Mon Sep 17 00:00:00 2001
From: Mark Pedrotti <pedrottimark@gmail.com>
Date: Wed, 10 Apr 2019 17:31:42 -0400
Subject: [PATCH 2/3] Update CHANGELOG.md

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4f0e0dfa58d..3dd8acc4a5e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Features
 
 - `[expect]` Improve report when matcher fails, part 15 ([#8281](https://github.com/facebook/jest/pull/8281))
+- `[expect]` Improve report when matcher fails, part 16 ([#8306](https://github.com/facebook/jest/pull/8306))
 
 ### Fixes
 

From 562bd6c30ec7fcfe67a4e9f2499bd1697b2f4d81 Mon Sep 17 00:00:00 2001
From: Mark Pedrotti <pedrottimark@gmail.com>
Date: Sat, 13 Apr 2019 17:14:47 -0400
Subject: [PATCH 3/3] Replace noun with verb: serializes to the same string

---
 .../src/__tests__/__snapshots__/matchers.test.js.snap  | 10 +++++-----
 packages/expect/src/print.ts                           |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap b/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
index a33c04d9431b..e74042085cc7 100644
--- a/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
+++ b/packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap
@@ -325,7 +325,7 @@ exports[`.toBe() fails for: [] and [] 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>[]</>
-Received: has same serialization"
+Received: serializes to the same string"
 `;
 
 exports[`.toBe() fails for: [Error: received] and [Error: expected] 1`] = `
@@ -339,7 +339,7 @@ exports[`.toBe() fails for: [Function anonymous] and [Function anonymous] 1`] =
 "<dim>expect(</><red>received</><dim>).</>toBe<dim>(</><green>expected</><dim>) // Object.is equality</>
 
 Expected: <green>[Function anonymous]</>
-Received: has same serialization"
+Received: serializes to the same string"
 `;
 
 exports[`.toBe() fails for: {"a": [Function a], "b": 2} and {"a": Any<Function>, "b": 2} 1`] = `
@@ -363,7 +363,7 @@ exports[`.toBe() fails for: {"a": 1} and {"a": 1} 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>{\\"a\\": 1}</>
-Received: has same serialization"
+Received: serializes to the same string"
 `;
 
 exports[`.toBe() fails for: {"a": 1} and {"a": 5} 1`] = `
@@ -398,7 +398,7 @@ exports[`.toBe() fails for: {} and {} 1`] = `
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>{}</>
-Received: has same serialization"
+Received: serializes to the same string"
 `;
 
 exports[`.toBe() fails for: -0 and 0 1`] = `
@@ -421,7 +421,7 @@ exports[`.toBe() fails for: 2020-02-20T00:00:00.000Z and 2020-02-20T00:00:00.000
 <dim>If it should pass with deep equality, replace \\"toBe\\" with \\"toStrictEqual\\"</>
 
 Expected: <green>2020-02-20T00:00:00.000Z</>
-Received: has same serialization"
+Received: serializes to the same string"
 `;
 
 exports[`.toBe() fails for: 2020-02-21T00:00:00.000Z and 2020-02-20T00:00:00.000Z 1`] = `
diff --git a/packages/expect/src/print.ts b/packages/expect/src/print.ts
index cf8a17bc422e..725a16ddbfac 100644
--- a/packages/expect/src/print.ts
+++ b/packages/expect/src/print.ts
@@ -114,7 +114,7 @@ export const printDiffOrStringify = (
     : `${expectedLabel}${printExpected(expected)}\n` +
         `${receivedLabel}${
           stringify(expected) === stringify(received)
-            ? 'has same serialization'
+            ? 'serializes to the same string'
             : printReceived(received)
         }`;
 };