Function TestDiff

cmp/compare_test.go:124–194

(t *testing.T)

}

func TestDiff(t *testing.T) {
	var tests []test
	tests = append(tests, comparerTests()...)
	tests = append(tests, transformerTests()...)
	tests = append(tests, reporterTests()...)
	tests = append(tests, embeddedTests()...)
	tests = append(tests, methodTests()...)
	tests = append(tests, cycleTests()...)
	tests = append(tests, project1Tests()...)
	tests = append(tests, project2Tests()...)
	tests = append(tests, project3Tests()...)
	tests = append(tests, project4Tests()...)

	const goldenFile = "testdata/diffs"
	gotDiffs := []struct{ Name, Data string }{}
	wantDiffs := mustParseGolden(goldenFile)
	for _, tt := range tests {
		tt := tt
		t.Run(tt.label, func(t *testing.T) {
			if !*update {
				t.Parallel()
			}
			var gotDiff, gotPanic string
			func() {
				defer func() {
					if ex := recover(); ex != nil {
						if s, ok := ex.(string); ok {
							gotPanic = s
						} else {
							panic(ex)
						}
					}
				}()
				gotDiff = cmp.Diff(tt.x, tt.y, tt.opts...)
			}()

			switch {
			case strings.Contains(t.Name(), "#"):
				panic("unique test name must be provided")
			case tt.reason == "":
				panic("reason must be provided")
			case tt.wantPanic == "":
				if gotPanic != "" {
					t.Fatalf("unexpected panic message: %s\nreason: %v", gotPanic, tt.reason)
				}
				if *update {
					if gotDiff != "" {
						gotDiffs = append(gotDiffs, struct{ Name, Data string }{t.Name(), gotDiff})
					}
				} else {
					wantDiff := wantDiffs[t.Name()]
					if diff := cmp.Diff(wantDiff, gotDiff); diff != "" {
						t.Fatalf("Diff:\ngot:\n%s\nwant:\n%s\ndiff: (-want +got)\n%s\nreason: %v", gotDiff, wantDiff, diff, tt.reason)
					}
				}
				gotEqual := gotDiff == ""
				if gotEqual != tt.wantEqual {
					t.Fatalf("Equal = %v, want %v\nreason: %v", gotEqual, tt.wantEqual, tt.reason)