diff --git a/jsoniter_bool_test.go b/jsoniter_bool_test.go
index 5a9aa75..461b88b 100644
--- a/jsoniter_bool_test.go
+++ b/jsoniter_bool_test.go
@@ -92,22 +92,22 @@ func Test_bool_can_be_null(t *testing.T) {
 	obj := TestData{}
 	data1 := []byte(`{"field": true}`)
 	err := Unmarshal(data1, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(true, obj.Field)
 
 	data2 := []byte(`{"field": null}`)
 	err = Unmarshal(data2, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	// Same behavior as stdlib, not touching the existing value.
 	should.Equal(true, obj.Field)
 
 	// Checking stdlib behavior as well
 	obj2 := TestData{}
 	err = json.Unmarshal(data1, &obj2)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(true, obj2.Field)
 
 	err = json.Unmarshal(data2, &obj2)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(true, obj2.Field)
 }
diff --git a/jsoniter_enum_marshaler_test.go b/jsoniter_enum_marshaler_test.go
index 4f9be8b..69e1e8c 100644
--- a/jsoniter_enum_marshaler_test.go
+++ b/jsoniter_enum_marshaler_test.go
@@ -40,11 +40,11 @@ func Test_custom_marshaler_on_enum(t *testing.T) {
 	w := Wrapper{Payload: MyEnumB}
 
 	jb, err := Marshal(w)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(`{"Payload":"foo-1"}`, string(jb))
 
 	var w2 Wrapper2
 	err = Unmarshal(jb, &w2)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(MyEnumB, w2.Payload)
 }
diff --git a/jsoniter_interface_test.go b/jsoniter_interface_test.go
index 9abfaa3..a464f46 100644
--- a/jsoniter_interface_test.go
+++ b/jsoniter_interface_test.go
@@ -329,13 +329,13 @@ func Test_nil_out_null_interface(t *testing.T) {
 	data1 := []byte(`{"field": true}`)
 
 	err := Unmarshal(data1, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(true, *(obj.Field.(*bool)))
 
 	data2 := []byte(`{"field": null}`)
 
 	err = Unmarshal(data2, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(nil, obj.Field)
 
 	// Checking stdlib behavior matches.
@@ -344,11 +344,11 @@ func Test_nil_out_null_interface(t *testing.T) {
 	}
 
 	err = json.Unmarshal(data1, &obj2)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(true, *(obj2.Field.(*bool)))
 
 	err = json.Unmarshal(data2, &obj2)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(nil, obj2.Field)
 }
 
@@ -363,11 +363,11 @@ func Test_omitempty_nil_interface(t *testing.T) {
 	}
 
 	js, err := json.Marshal(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal("{}", string(js))
 
 	str, err := MarshalToString(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(string(js), str)
 }
 
@@ -382,16 +382,16 @@ func Test_omitempty_nil_nonempty_interface(t *testing.T) {
 	}
 
 	js, err := json.Marshal(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal("{}", string(js))
 
 	str, err := MarshalToString(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(string(js), str)
 
 	obj.Field = MyString("hello")
 	err = UnmarshalFromString(`{"field":null}`, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(nil, obj.Field)
 }
 
@@ -406,11 +406,11 @@ func Test_marshal_nil_marshaler_interface(t *testing.T) {
 	}
 
 	js, err := json.Marshal(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(`{"field":null}`, string(js))
 
 	str, err := MarshalToString(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(string(js), str)
 }
 
@@ -425,15 +425,15 @@ func Test_marshal_nil_nonempty_interface(t *testing.T) {
 	}
 
 	js, err := json.Marshal(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(`{"field":null}`, string(js))
 
 	str, err := MarshalToString(obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(string(js), str)
 
 	obj.Field = MyString("hello")
 	err = Unmarshal(js, &obj)
-	should.Equal(nil, err)
+	should.NoError(err)
 	should.Equal(nil, obj.Field)
 }