support map (#4)

deepequal.go

@@ -88,7 +88,7 @@ var eqs = map[reflect.Kind]func(v1, v2 reflect.Value, nx next) bool{
 	reflect.Interface:  interfaceEq,
 	reflect.Pointer:    pointerEq,
 	reflect.Struct:     structEq,
-	reflect.Map:        todo,
+	reflect.Map:        mapEq,
 	reflect.Func:       todo,
 	reflect.Int:        intEq,
 	reflect.Int8:       intEq,
@@ -175,6 +175,26 @@ func structEq(v1, v2 reflect.Value, nx next) bool {
 	return true
 }
 
+func mapEq(v1, v2 reflect.Value, nx next) bool {
+	if v1.IsNil() != v2.IsNil() {
+		return false
+	}
+	if v1.Len() != v2.Len() {
+		return false
+	}
+	if v1.UnsafePointer() == v2.UnsafePointer() {
+		return true
+	}
+	for _, k := range v1.MapKeys() {
+		val1 := v1.MapIndex(k)
+		val2 := v2.MapIndex(k)
+		if !val1.IsValid() || !val2.IsValid() || !nx(val1, val2) {
+			return false
+		}
+	}
+	return true
+}
+
 func intEq(v1, v2 reflect.Value, _ next) bool     { return v1.Int() == v2.Int() }
 func uintEq(v1, v2 reflect.Value, _ next) bool    { return v1.Uint() == v2.Uint() }
 func stringEq(v1, v2 reflect.Value, _ next) bool  { return v1.String() == v2.String() }

teq_default_test.go

@@ -26,6 +26,7 @@ func TestEqual(t *testing.T) {
 		{"primitives", primitives()},
 		{"structs", structs()},
 		{"slices", slices()},
+		{"maps", maps()},
 		{"recursions", recursions()},
 	}
 
@@ -111,6 +112,36 @@ func slices() []test {
 	}
 }
 
+func maps() []test {
+	return []test{
+		{map[string]int{"a": 1}, map[string]int{"a": 1}, nil, false},
+		{map[string]int{"a": 1}, map[string]int{"a": 2}, []string{"expected map[a:1], got map[a:2]"}, false},
+		{map[string]int{"a": 1}, map[string]int{"b": 1}, []string{"expected map[a:1], got map[b:1]"}, false},
+		{map[string]int{"a": 0}, map[string]int{}, []string{"expected map[a:0], got map[]"}, false},
+
+		{
+			map[int]map[string]int{
+				1: {"abc": 1},
+			},
+			map[int]map[string]int{
+				1: {"abc": 1},
+			},
+			nil,
+			false,
+		},
+		{
+			map[int]map[string]int{
+				1: {"abc": 1},
+			},
+			map[int]map[string]int{
+				1: {"abc": 2},
+			},
+			[]string{"expected map[1:map[abc:1]], got map[1:map[abc:2]]"},
+			false,
+		},
+	}
+}
+
 func recursions() []test {
 	type privateRecursiveStruct struct {
 		i int