From 63f2e2c37783a0ddb41d96f984c65f4b1a6acf73 Mon Sep 17 00:00:00 2001
From: Eric Mueller <nevinera@gmail.com>
Date: Thu, 9 May 2024 14:03:15 -0400
Subject: [PATCH] Add tests checking handling of single-line string arrays

(as described in rspec-expectations/#415)
---
 spec/rspec/support/differ_spec.rb | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/spec/rspec/support/differ_spec.rb b/spec/rspec/support/differ_spec.rb
index cbd1ed28f..3d84b3c09 100644
--- a/spec/rspec/support/differ_spec.rb
+++ b/spec/rspec/support/differ_spec.rb
@@ -116,6 +116,36 @@ module Support
           expect { differ.diff(actual, expected) }.not_to change { differ_ivars }
         end
 
+        it 'returns the expected diff for arrays of single-line strings' do
+          expected = ["foo"]
+          actual   = ["foo", "bar"]
+
+          expected_diff = dedent(<<-'EOS')
+            |
+            |@@ -1,2 +1,3 @@
+            | foo
+            |+bar
+            |
+          EOS
+          diff = differ.diff(actual, expected)
+          expect(diff).to eq(expected_diff)
+        end
+
+        it 'does not give an empty string for single-element arrays of single-line strings' do
+          expected = ["foo"]
+          actual   = ["bar"]
+
+          expected_diff = dedent(<<-'EOS')
+            |
+            |@@ -1 +1 @@
+            |-foo
+            |+bar
+            |
+          EOS
+          diff = differ.diff(actual, expected)
+          expect(diff).to eq(expected_diff)
+        end
+
         def differ_ivars
           Hash[ differ.instance_variables.map do |ivar|
             [ivar, differ.instance_variable_get(ivar)]