Publish an example testing go code with Postgres

user_repository_test.go

@@ -0,0 +1,77 @@
+// Copyright (c) 2023 Vasiliy Vasilyuk. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package testing_go_code_with_postgres
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/require"
+
+	"github.com/xorcare/testing-go-code-with-postgres/testingpg"
+)
+
+func TestUserRepository_CreateUser(t *testing.T) {
+	newFullyFiledUser := func() User {
+		return User{
+			ID:        uuid.New(),
+			Username:  "gopher",
+			CreatedAt: time.Now().Truncate(time.Microsecond),
+		}
+	}
+
+	t.Run("Successfully created a User", func(t *testing.T) {
+		// Arrange
+		postgres := testingpg.New(t)
+		repo := NewUserRepository(postgres.PgxPool())
+
+		user := newFullyFiledUser()
+
+		// Act
+		err := repo.CreateUser(context.Background(), user)
+
+		// Assert
+		require.NoError(t, err)
+
+		gotUser, err := repo.ReadUser(context.Background(), user.ID)
+		require.NoError(t, err)
+
+		require.Equal(t, user, gotUser)
+	})
+
+	t.Run("Cannot create a user with the same ID", func(t *testing.T) {
+		// Arrange
+		postgres := testingpg.New(t)
+		repo := NewUserRepository(postgres.PgxPool())
+
+		user := newFullyFiledUser()
+
+		err := repo.CreateUser(context.Background(), user)
+		require.NoError(t, err)
+
+		// Act
+		err = repo.CreateUser(context.Background(), user)
+
+		// Assert
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "duplicate key value violates unique constraint")
+	})
+}
+
+func TestUserRepository_ReadUser(t *testing.T) {
+	t.Run("Get an error if the user does not exist", func(t *testing.T) {
+		// Arrange
+		postgres := testingpg.New(t)
+		repo := NewUserRepository(postgres.PgxPool())
+
+		// Act
+		_, err := repo.ReadUser(context.Background(), uuid.New())
+
+		// Assert
+		require.Error(t, err)
+	})
+}