assert: allow comparing time.Time

assert/assertion_compare.go

@@ -3,6 +3,7 @@ package assert
 import (
 	"fmt"
 	"reflect"
+	"time"
 )
 
 type CompareType int
@@ -30,6 +31,8 @@ var (
 	float64Type = reflect.TypeOf(float64(1))
 
 	stringType = reflect.TypeOf("")
+
+	timeType = reflect.TypeOf(time.Time{})
 )
 
 func compare(obj1, obj2 interface{}, kind reflect.Kind) (CompareType, bool) {
@@ -299,6 +302,27 @@ func compare(obj1, obj2 interface{}, kind reflect.Kind) (CompareType, bool) {
 				return compareLess, true
 			}
 		}
+	// Check for known struct types we can check for compare results.
+	case reflect.Struct:
+		{
+			// All structs enter here. We're not interested in most types.
+			if !obj1Value.CanConvert(timeType) {
+				break
+			}
+
+			// time.Time can compared!
+			timeObj1, ok := obj1.(time.Time)
+			if !ok {
+				timeObj1 = obj1Value.Convert(timeType).Interface().(time.Time)
+			}
+
+			timeObj2, ok := obj2.(time.Time)
+			if !ok {
+				timeObj2 = obj2Value.Convert(timeType).Interface().(time.Time)
+			}
+
+			return compare(timeObj1.UnixNano(), timeObj2.UnixNano(), reflect.Int64)
+		}
 	}
 
 	return compareEqual, false

assert/assertion_compare_test.go

@@ -6,6 +6,7 @@ import (
 	"reflect"
 	"runtime"
 	"testing"
+	"time"
 )
 
 func TestCompare(t *testing.T) {
@@ -22,6 +23,7 @@ func TestCompare(t *testing.T) {
 	type customFloat32 float32
 	type customFloat64 float64
 	type customString string
+	type customTime time.Time
 	for _, currCase := range []struct {
 		less    interface{}
 		greater interface{}
@@ -52,14 +54,17 @@ func TestCompare(t *testing.T) {
 		{less: customFloat32(1.23), greater: customFloat32(2.23), cType: "float32"},
 		{less: float64(1.23), greater: float64(2.34), cType: "float64"},
 		{less: customFloat64(1.23), greater: customFloat64(2.34), cType: "float64"},
+		{less: time.Now(), greater: time.Now().Add(time.Hour), cType: "time.Time"},
+		{less: customTime(time.Now()), greater: customTime(time.Now().Add(time.Hour)), cType: "time.Time"},
 	} {
 		resLess, isComparable := compare(currCase.less, currCase.greater, reflect.ValueOf(currCase.less).Kind())
 		if !isComparable {
 			t.Error("object should be comparable for type " + currCase.cType)
 		}
 
 		if resLess != compareLess {
-			t.Errorf("object less should be less than greater for type " + currCase.cType)
+			t.Errorf("object less (%v) should be less than greater (%v) for type "+currCase.cType,
+				currCase.less, currCase.greater)
 		}
 
 		resGreater, isComparable := compare(currCase.greater, currCase.less, reflect.ValueOf(currCase.less).Kind())