diff --git a/reader_test.go b/reader_test.go
index c121803..735d5bd 100644
--- a/reader_test.go
+++ b/reader_test.go
@@ -31,16 +31,16 @@ func TestReadForm(t *testing.T) {
 		D  []int
 	}
 	values := map[string][]string{
-		"x1":   []string{"abc", "123"},
-		"A1":   []string{"a1"},
-		"x2":   []string{"1", "2"},
-		"B.B1": []string{"b1", "b2"},
-		"B.B2": []string{"true"},
-		"B.B3": []string{"1.23"},
-		"c.B1": []string{"fb1", "fb2"},
-		"e.B1": []string{"fe1", "fe2"},
-		"c":    []string{"100"},
-		"D":    []string{"100", "200", "300"},
+		"x1":   {"abc", "123"},
+		"A1":   {"a1"},
+		"x2":   {"1", "2"},
+		"B.B1": {"b1", "b2"},
+		"B.B2": {"true"},
+		"B.B3": {"1.23"},
+		"c.B1": {"fb1", "fb2"},
+		"e.B1": {"fe1", "fe2"},
+		"c":    {"100"},
+		"D":    {"100", "200", "300"},
 	}
 	err := ReadFormData(values, &a)
 	assert.Nil(t, err)
@@ -100,8 +100,8 @@ func TestTextUnmarshaler(t *testing.T) {
 		NTU string `form:"ntu"`
 	}
 	values := map[string][]string{
-		"atu": []string{"ORIGINAL"},
-		"ntu": []string{"ORIGINAL"},
+		"atu": {"ORIGINAL"},
+		"ntu": {"ORIGINAL"},
 	}
 	err := ReadFormData(values, &a)
 	assert.Nil(t, err)
diff --git a/slash/remover_test.go b/slash/remover_test.go
index 3dd0447..75d9147 100644
--- a/slash/remover_test.go
+++ b/slash/remover_test.go
@@ -27,6 +27,7 @@ func TestRemover(t *testing.T) {
 	req, _ = http.NewRequest("GET", "/", nil)
 	c = routing.NewContext(res, req)
 	err = h(c)
+	assert.Nil(t, err, "return value is nil")
 	assert.Equal(t, http.StatusOK, res.Code)
 	assert.Equal(t, "", res.Header().Get("Location"))
 
@@ -34,6 +35,7 @@ func TestRemover(t *testing.T) {
 	req, _ = http.NewRequest("GET", "/users", nil)
 	c = routing.NewContext(res, req)
 	err = h(c)
+	assert.Nil(t, err, "return value is nil")
 	assert.Equal(t, http.StatusOK, res.Code)
 	assert.Equal(t, "", res.Header().Get("Location"))
 
@@ -41,6 +43,7 @@ func TestRemover(t *testing.T) {
 	req, _ = http.NewRequest("POST", "/users/", nil)
 	c = routing.NewContext(res, req)
 	err = h(c)
+	assert.Nil(t, err, "return value is nil")
 	assert.Equal(t, http.StatusTemporaryRedirect, res.Code)
 	assert.Equal(t, "/users", res.Header().Get("Location"))
 }