fix: assert.MapSubset (or just support maps in assert.Subset) (#1178)

* WIP: added map key value check in subset

* upgraded subset & notsubset to check handle maps

assert/assertions.go

@@ -816,7 +816,6 @@ func Subset(t TestingT, list, subset interface{}, msgAndArgs ...interface{}) (ok
 		return true // we consider nil to be equal to the nil set
 	}
 
-	subsetValue := reflect.ValueOf(subset)
 	defer func() {
 		if e := recover(); e != nil {
 			ok = false
@@ -826,14 +825,32 @@ func Subset(t TestingT, list, subset interface{}, msgAndArgs ...interface{}) (ok
 	listKind := reflect.TypeOf(list).Kind()
 	subsetKind := reflect.TypeOf(subset).Kind()
 
-	if listKind != reflect.Array && listKind != reflect.Slice {
+	if listKind != reflect.Array && listKind != reflect.Slice && listKind != reflect.Map {
 		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", list, listKind), msgAndArgs...)
 	}
 
-	if subsetKind != reflect.Array && subsetKind != reflect.Slice {
+	if subsetKind != reflect.Array && subsetKind != reflect.Slice && listKind != reflect.Map {
 		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", subset, subsetKind), msgAndArgs...)
 	}
 
+	subsetValue := reflect.ValueOf(subset)
+	if subsetKind == reflect.Map && listKind == reflect.Map {
+		listValue := reflect.ValueOf(list)
+		subsetKeys := subsetValue.MapKeys()
+
+		for i := 0; i < len(subsetKeys); i++ {
+			subsetKey := subsetKeys[i]
+			subsetElement := subsetValue.MapIndex(subsetKey).Interface()
+			listElement := listValue.MapIndex(subsetKey).Interface()
+
+			if !ObjectsAreEqual(subsetElement, listElement) {
+				return Fail(t, fmt.Sprintf("\"%s\" does not contain \"%s\"", list, subsetElement), msgAndArgs...)
+			}
+		}
+
+		return true
+	}
+
 	for i := 0; i < subsetValue.Len(); i++ {
 		element := subsetValue.Index(i).Interface()
 		ok, found := containsElement(list, element)
@@ -860,7 +877,6 @@ func NotSubset(t TestingT, list, subset interface{}, msgAndArgs ...interface{})
 		return Fail(t, "nil is the empty set which is a subset of every set", msgAndArgs...)
 	}
 
-	subsetValue := reflect.ValueOf(subset)
 	defer func() {
 		if e := recover(); e != nil {
 			ok = false
@@ -870,14 +886,32 @@ func NotSubset(t TestingT, list, subset interface{}, msgAndArgs ...interface{})
 	listKind := reflect.TypeOf(list).Kind()
 	subsetKind := reflect.TypeOf(subset).Kind()
 
-	if listKind != reflect.Array && listKind != reflect.Slice {
+	if listKind != reflect.Array && listKind != reflect.Slice && listKind != reflect.Map {
 		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", list, listKind), msgAndArgs...)
 	}
 
-	if subsetKind != reflect.Array && subsetKind != reflect.Slice {
+	if subsetKind != reflect.Array && subsetKind != reflect.Slice && listKind != reflect.Map {
 		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", subset, subsetKind), msgAndArgs...)
 	}
 
+	subsetValue := reflect.ValueOf(subset)
+	if subsetKind == reflect.Map && listKind == reflect.Map {
+		listValue := reflect.ValueOf(list)
+		subsetKeys := subsetValue.MapKeys()
+
+		for i := 0; i < len(subsetKeys); i++ {
+			subsetKey := subsetKeys[i]
+			subsetElement := subsetValue.MapIndex(subsetKey).Interface()
+			listElement := listValue.MapIndex(subsetKey).Interface()
+
+			if !ObjectsAreEqual(subsetElement, listElement) {
+				return true
+			}
+		}
+
+		return Fail(t, fmt.Sprintf("%q is a subset of %q", subset, list), msgAndArgs...)
+	}
+
 	for i := 0; i < subsetValue.Len(); i++ {
 		element := subsetValue.Index(i).Interface()
 		ok, found := containsElement(list, element)

assert/assertions_test.go

@@ -685,11 +685,27 @@ func TestSubsetNotSubset(t *testing.T) {
 		{[]int{1, 2, 3}, []int{1, 2}, true, "[1, 2, 3] contains [1, 2]"},
 		{[]int{1, 2, 3}, []int{1, 2, 3}, true, "[1, 2, 3] contains [1, 2, 3"},
 		{[]string{"hello", "world"}, []string{"hello"}, true, "[\"hello\", \"world\"] contains [\"hello\"]"},
+		{map[string]string{
+			"a": "x",
+			"c": "z",
+			"b": "y",
+		}, map[string]string{
+			"a": "x",
+			"b": "y",
+		}, true, `{ "a": "x", "b": "y", "c": "z"} contains { "a": "x", "b": "y"}`},
 
 		// cases that are expected not to contain
 		{[]string{"hello", "world"}, []string{"hello", "testify"}, false, "[\"hello\", \"world\"] does not contain [\"hello\", \"testify\"]"},
 		{[]int{1, 2, 3}, []int{4, 5}, false, "[1, 2, 3] does not contain [4, 5"},
 		{[]int{1, 2, 3}, []int{1, 5}, false, "[1, 2, 3] does not contain [1, 5]"},
+		{map[string]string{
+			"a": "x",
+			"c": "z",
+			"b": "y",
+		}, map[string]string{
+			"a": "x",
+			"b": "z",
+		}, false, `{ "a": "x", "b": "y", "c": "z"} does not contain { "a": "x", "b": "z"}`},
 	}
 
 	for _, c := range cases {