changing time.Duration equality mismatch output from int64 to readable format. Fixes #626

(cherry picked from commit 637cd144ddae7a3792bcb5c74a3bf3a071c0a250)

assert/assertions.go

@@ -432,9 +432,11 @@ func formatUnequalValues(expected, actual interface{}) (e string, a string) {
 		return fmt.Sprintf("%T(%#v)", expected, expected),
 			fmt.Sprintf("%T(%#v)", actual, actual)
 	}
-
-	return fmt.Sprintf("%#v", expected),
-		fmt.Sprintf("%#v", actual)
+	switch expected.(type) {
+	case time.Duration:
+		return fmt.Sprintf("%v", expected), fmt.Sprintf("%v", actual)
+	}
+	return fmt.Sprintf("%#v", expected), fmt.Sprintf("%#v", actual)
 }
 
 // EqualValues asserts that two objects are equal or convertable to the same types

assert/assertions_test.go

@@ -1831,6 +1831,15 @@ Diff:
 	Equal(t, expected, actual)
 }
 
+func TestTimeEqualityErrorFormatting(t *testing.T) {
+	mockT := new(mockTestingT)
+
+	Equal(mockT, time.Second*2, time.Millisecond)
+
+	expectedErr := "\\s+Error Trace:\\s+Error:\\s+Not equal:\\s+\n\\s+expected: 2s\n\\s+actual\\s+: 1ms\n"
+	Regexp(t, regexp.MustCompile(expectedErr), mockT.errorString())
+}
+
 func TestDiffEmptyCases(t *testing.T) {
 	Equal(t, "", diff(nil, nil))
 	Equal(t, "", diff(struct{ foo string }{}, nil))
@@ -1875,9 +1884,18 @@ func TestDiffRace(t *testing.T) {
 }
 
 type mockTestingT struct {
+	errorFmt string
+	args     []interface{}
 }
 
-func (m *mockTestingT) Errorf(format string, args ...interface{}) {}
+func (m *mockTestingT) errorString() string {
+	return fmt.Sprintf(m.errorFmt, m.args...)
+}
+
+func (m *mockTestingT) Errorf(format string, args ...interface{}) {
+	m.errorFmt = format
+	m.args = args
+}
 
 func TestFailNowWithPlainTestingT(t *testing.T) {
 	mockT := &mockTestingT{}