Use akyoto/assert for tests

arn/User_test.go

@@ -1,18 +1,17 @@
 package arn_test
 
 import (
-	"strings"
 	"testing"
 
+	"github.com/akyoto/assert"
 	"github.com/animenotifier/notify.moe/arn"
-	"github.com/stretchr/testify/assert"
 )
 
 func TestNewUser(t *testing.T) {
 	user := arn.NewUser()
 
 	assert.NotNil(t, user)
-	assert.NotEmpty(t, user.ID)
+	assert.NotEqual(t, user.ID, "")
 }
 
 func TestDatabaseErrorMessages(t *testing.T) {
@@ -20,6 +19,5 @@ func TestDatabaseErrorMessages(t *testing.T) {
 
 	// We need to make sure that non-existent records return "not found" in the error message.
 	assert.NotNil(t, err)
-	assert.NotEmpty(t, err.Error())
-	assert.NotEqual(t, -1, strings.Index(err.Error(), "not found"))
+	assert.Contains(t, err.Error(), "not found")
 }