feat: expose Diff() function

.golangci.yml

@@ -52,6 +52,8 @@ linters:
     - structcheck
     - deadcode
     - nosnakecase
+    - mnd
+    - perfsprint
 
 linters-settings:
   govet:

assert.go

@@ -87,7 +87,7 @@ func Equal[T any](t testing.TB, expected, actual T, msgArgsAndCompareOptions ...
 	}
 	t.Helper()
 	msg := formatMsgAndArgs("Expected values to be equal:", msgArgsAndCompareOptions...)
-	t.Fatalf("%s\n%s", msg, diff(expected, actual, compareOptions...))
+	t.Fatalf("%s\n%s", msg, Diff(expected, actual, compareOptions...))
 }
 
 // NotEqual asserts that "expected" is not equal to "actual".
@@ -165,7 +165,7 @@ func EqualError(t testing.TB, err error, errString string, msgAndArgs ...any) {
 	}
 	if err.Error() != errString {
 		msg := formatMsgAndArgs("Error message not as expected:", msgAndArgs...)
-		t.Fatalf("%s\n%s", msg, diff(errString, err.Error()))
+		t.Fatalf("%s\n%s", msg, Diff(errString, err.Error()))
 	}
 }
 
@@ -248,7 +248,8 @@ func NotPanics(t testing.TB, fn func(), msgAndArgs ...any) {
 	fn()
 }
 
-func diff[T any](before, after T, compareOptions ...CompareOption) string {
+// Diff returns a unified diff of the string representation of two values.
+func Diff[T any](before, after T, compareOptions ...CompareOption) string {
 	var lhss, rhss string
 	// Special case strings so we get nice diffs.
 	if l, ok := any(before).(string); ok {

assert_test.go

@@ -173,7 +173,7 @@ func TestNotIsError(t *testing.T) {
 }
 
 func TestDiff(t *testing.T) {
-	Equal(t, "-before\n+after\n", diff("before", "after"))
+	Equal(t, "-before\n+after\n", Diff("before", "after"))
 }
 
 func TestHasSuffix(t *testing.T) {

bin/go

@@ -1 +1 @@
-.go-1.20.5.pkg
+.go-1.22.3.pkg

bin/gofmt

@@ -1 +1 @@
-.go-1.20.5.pkg
+.go-1.22.3.pkg

bin/golangci-lint

@@ -1 +1 @@
-.golangci-lint-1.53.2.pkg
+.golangci-lint-1.58.2.pkg

renovate.json5

@@ -0,0 +1,18 @@
+{
+	$schema: "https://docs.renovatebot.com/renovate-schema.json",
+	extends: [
+		"config:recommended",
+		":semanticCommits",
+		":semanticCommitTypeAll(chore)",
+		":semanticCommitScope(deps)",
+		"group:allNonMajor",
+		"schedule:earlyMondays", // Run once a week.
+	],
+	packageRules: [
+		{
+			matchPackageNames: ["golangci-lint"],
+			matchManagers: ["hermit"],
+			enabled: false,
+		},
+	],
+}