diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
new file mode 100644
index 0000000..c43789d
--- /dev/null
+++ b/.github/workflows/phpunit.yml
@@ -0,0 +1,90 @@
+name: PHPUnit
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_DATABASE: test
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_USER: postgres
+          POSTGRES_DB: test
+        ports:
+          - 5432:5432
+        options:
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [ 8.0, 8.1, 8.2, 8.3, 8.4 ]
+
+    name: PHP ${{ matrix.php }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+          coverage: xdebug
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate
+
+      - name: Install dependencies
+        if: steps.composer-cache.outputs.cache-hit != 'true'
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Run test suite
+        run: ./vendor/bin/phpunit -v
+
+      - name: Run Coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_PARALLEL: true
+          COVERALLS_FLAG_NAME: ${{ runner.os }} - ${{ matrix.php }}
+        run: ./vendor/bin/php-coveralls --coverage_clover=build/logs/clover.xml -v
+
+  upload-coverage:
+    runs-on: ubuntu-latest
+    needs: [ test ]
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true
+
+  semantic-release:
+    runs-on: ubuntu-latest
+    needs: [ test, upload-coverage ]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 'lts/*'
+
+      - name: Run semantic-release
+        if: github.repository == 'leeqvip/database' && github.event_name == 'push'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+        run: npx semantic-release
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cf47104
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,13 @@
+/vendor/
+
+composer.lock
+
+.vscode
+.idea
+*.iml
+
+# coverage report
+/build
+
+.phpunit.*
+phpunit.xml
\ No newline at end of file
diff --git a/.releaserc.yml b/.releaserc.yml
new file mode 100644
index 0000000..4a17b28
--- /dev/null
+++ b/.releaserc.yml
@@ -0,0 +1,4 @@
+plugins:
+  - "@semantic-release/commit-analyzer"
+  - "@semantic-release/release-notes-generator"
+  - "@semantic-release/github"
\ No newline at end of file
diff --git a/README.md b/README.md
index c50d72c..7a93c9b 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,11 @@
 # Database library for PHP
 
+[![PHPUnit](https://github.com/leeqvip/database/actions/workflows/phpunit.yml/badge.svg)](https://github.com/leeqvip/database/actions/workflows/phpunit.yml)
+[![Coverage Status](https://coveralls.io/repos/github/leeqvip/database/badge.svg)](https://coveralls.io/github/leeqvip/database)
+[![Latest Stable Version](https://poser.pugx.org/leeqvip/database/v/stable)](https://packagist.org/packages/leeqvip/database)
+[![Total Downloads](https://poser.pugx.org/leeqvip/database/downloads)](https://packagist.org/packages/leeqvip/database)
+[![License](https://poser.pugx.org/leeqvip/database/license)](https://packagist.org/packages/leeqvip/database)
+
 PDO database library for PHP.
 
 the current supported databases are:
diff --git a/composer.json b/composer.json
index 9c4b108..7589d13 100644
--- a/composer.json
+++ b/composer.json
@@ -1,21 +1,35 @@
 {
-    "name": "leeqvip/database",
-    "keywords": ["pdo", "database", "orm", "framework"],
-    "description": "PDO database library",
-    "authors": [
-        {
-            "name": "leeqvip",
-            "email": "leeqvip@gmail.com"
-        }
-    ],
-    "license": "Apache-2.0",
-    "require": {
-    	"php": ">=5.4.0",
-        "ext-pdo": "*"
-    },
-    "autoload": {
-        "psr-4": {
-            "Leeqvip\\Database\\": "src/"
-        }
-    }
+	"name": "leeqvip/database",
+	"keywords": [
+		"pdo",
+		"database",
+		"orm",
+		"framework"
+	],
+	"description": "PDO database library",
+	"authors": [
+		{
+			"name": "leeqvip",
+			"email": "leeqvip@gmail.com"
+		}
+	],
+	"license": "Apache-2.0",
+	"require": {
+		"php": ">=8.0",
+		"ext-pdo": "*"
+	},
+	"require-dev": {
+		"phpunit/phpunit": "^9.6",
+		"php-coveralls/php-coveralls": "^2.7"
+	},
+	"autoload": {
+		"psr-4": {
+			"Leeqvip\\Database\\": "src/"
+		}
+	},
+	"autoload-dev": {
+		"psr-4": {
+			"Tests\\": "tests/"
+		}
+	}
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..8db31af
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php" colors="true" convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false"
+         stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+    <coverage processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+        <report>
+            <clover outputFile="build/logs/clover.xml"/>
+            <html outputDirectory="build/html"/>
+        </report>
+    </coverage>
+    <testsuites>
+        <testsuite name="Application Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <logging/>
+    <php>
+        <env name="DB_HOST" value="127.0.0.1"/>
+        <env name="DB_PORT" value="3306"/>
+        <env name="DB_DATABASE" value="test"/>
+        <env name="DB_USERNAME" value="root"/>
+        <env name="DB_PASSWORD" value=""/>
+
+        <env name="PG_HOST" value="127.0.0.1"/>
+        <env name="PG_PORT" value="5432"/>
+        <env name="PG_DATABASE" value="test"/>
+        <env name="PG_USERNAME" value="postgres"/>
+        <env name="PG_PASSWORD" value="postgres"/>
+    </php>
+</phpunit>
diff --git a/src/Connection.php b/src/Connection.php
index 73b8b29..e7e7d22 100644
--- a/src/Connection.php
+++ b/src/Connection.php
@@ -37,7 +37,7 @@ public function __construct(array $config = [])
         $this->connector = new $connector();
     }
 
-    public function getPdo()
+    public function getPdo(): PDO
     {
         if (is_null($this->pdo)) {
             $this->connect();
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..3997bea
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1 @@
+*.db
\ No newline at end of file
diff --git a/tests/ConnectionTest.php b/tests/ConnectionTest.php
new file mode 100644
index 0000000..8119112
--- /dev/null
+++ b/tests/ConnectionTest.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Tests;
+
+use Leeqvip\Database\Connection;
+use PHPUnit\Framework\TestCase;
+
+abstract class ConnectionTest extends TestCase
+{
+
+    protected $config = [];
+
+    abstract protected function initConfig();
+
+    protected function initDatabase()
+    {
+        $pdo = $this->getPDO();
+        $pdo->exec("DROP TABLE IF EXISTS users");
+        $pdo->exec(<<<EOT
+            CREATE TABLE users (
+              id int NOT NULL,
+              name varchar(191) DEFAULT NULL,
+              nickname varchar(255) DEFAULT NULL,
+              created_at timestamp NULL DEFAULT NULL
+            );
+            EOT
+        );
+    }
+
+    protected function init()
+    {
+        $this->initConfig();
+        $this->initDatabase();
+    }
+
+    protected function getConnection()
+    {
+        return new Connection($this->config);
+    }
+
+    protected function getPDO(): \PDO
+    {
+        return $this->getConnection()->getPdo();
+    }
+
+    public function testQuery()
+    {
+        $this->init();
+        $this->getPDO()->exec("INSERT INTO users (id, name, nickname, created_at) VALUES (100, 'alice', 'Small Flower', '2025-05-17 13:28:56')");
+
+        $users = $this->getConnection()->query("SELECT * FROM users");
+        $this->assertCount(1, $users);
+
+        $users = $this->getConnection()->query("SELECT * FROM users WHERE id = :id", ['id' => 100]);
+        $this->assertCount(1, $users);
+
+        $this->assertEquals('100', $users[0]['id']);
+        $this->assertEquals('alice', $users[0]['name']);
+        $this->assertEquals('Small Flower', $users[0]['nickname']);
+    }
+
+    public function testExecute()
+    {
+        $this->init();
+        $conn = $this->getConnection();
+
+        $users = $conn->query("SELECT * FROM users");
+        $this->assertCount(0, $users);
+        $conn->execute(
+            "INSERT INTO users (id, name, nickname, created_at) VALUES (:id, :name, :nickname, '2025-05-17 13:28:56')",
+            [
+                'id' => 200,
+                'name' => 'bob',
+                'nickname' => 'Small Angel',
+            ],
+        );
+
+        $users = $conn->query("SELECT * FROM users");
+        $this->assertCount(1, $users);
+
+        $this->assertEquals('200', $users[0]['id']);
+        $this->assertEquals('bob', $users[0]['name']);
+        $this->assertEquals('Small Angel', $users[0]['nickname']);
+    }
+}
diff --git a/tests/MysqlConnectionTest.php b/tests/MysqlConnectionTest.php
new file mode 100644
index 0000000..a648863
--- /dev/null
+++ b/tests/MysqlConnectionTest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Tests;
+
+
+class MysqlConnectionTest extends ConnectionTest
+{
+
+    protected $config = [];
+
+    protected function initConfig()
+    {
+        $this->config = [
+            'type' => 'mysql', // mysql,pgsql,sqlite,sqlsrv
+            'hostname' => getenv('DB_HOST'),
+            'database' => getenv('DB_DATABASE'),
+            'username' => getenv('DB_USERNAME'),
+            'password' => getenv('DB_PASSWORD'),
+            'hostport' => getenv('DB_PORT'),
+        ];
+    }
+}
diff --git a/tests/PostgresConnectionTest.php b/tests/PostgresConnectionTest.php
new file mode 100644
index 0000000..764ce5c
--- /dev/null
+++ b/tests/PostgresConnectionTest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Tests;
+
+
+class PostgresConnectionTest extends ConnectionTest
+{
+
+    protected $config = [];
+
+    protected function initConfig()
+    {
+        $this->config = [
+            'type' => 'pgsql', // mysql,pgsql,sqlite,sqlsrv
+            'hostname' => getenv('PG_HOST'),
+            'database' => getenv('PG_DATABASE'),
+            'username' => getenv('PG_USERNAME'),
+            'password' => getenv('PG_PASSWORD'),
+            'hostport' => getenv('PG_PORT'),
+        ];
+    }
+}
diff --git a/tests/SqliteConnectionTest.php b/tests/SqliteConnectionTest.php
new file mode 100644
index 0000000..2a4db58
--- /dev/null
+++ b/tests/SqliteConnectionTest.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Tests;
+
+
+class SqliteConnectionTest extends ConnectionTest
+{
+
+    protected $config = [];
+
+    protected function initConfig()
+    {
+        $this->config = [
+            'type' => 'sqlite', // mysql,pgsql,sqlite,sqlsrv
+            'database' => __DIR__.'/test.db',
+        ];
+    }
+}
+