Function TestErrorMessageFormat

error_test.go:13–42

TestErrorMessageFormat verifies that error messages match stdlib format. stdlib returns *syntax.Error directly with format: "error parsing regexp: ..."

(t *testing.T)

// TestErrorMessageFormat verifies that error messages match stdlib format.
// stdlib returns *syntax.Error directly with format: "error parsing regexp: ..."
func TestErrorMessageFormat(t *testing.T) {
	patterns := []string{
		"[invalid",
		`\`,
		"(abc",
		"*abc",
		`\8`,
	}

	for _, pattern := range patterns {
		t.Run(pattern, func(t *testing.T) {
			_, stdlibErr := regexp.Compile(pattern)
			_, ourErr := Compile(pattern)

			if stdlibErr == nil {
				t.Skip("stdlib accepts this pattern")
			}

			if ourErr == nil {
				t.Fatalf("Compile(%q) expected error, got nil", pattern)
			}

			// Error messages should match exactly
			if ourErr.Error() != stdlibErr.Error() {
				t.Errorf("error message mismatch:\n  got:  %q\n  want: %q",
					ourErr.Error(), stdlibErr.Error())
			}
		})
	}
}

// TestMustCompilePanicFormat verifies MustCompile panic message matches stdlib format.
func TestMustCompilePanicFormat(t *testing.T) {