diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..7fb0d41
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,41 @@
+name: Tests
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Run test suite
+        run: composer test
diff --git a/composer.json b/composer.json
index d7081fb..a67bfe6 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,6 @@
   "name": "naingaunglwin-dev/dotenv",
   "description": "Simple and lightweight php dotenv library",
   "minimum-stability": "dev",
-  "version": "2.0.0",
   "prefer-stable": true,
   "license": "MIT",
   "authors": [
@@ -22,5 +21,8 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^11.5"
+  },
+  "scripts": {
+    "test": "vendor/bin/phpunit tests"
   }
 }
diff --git a/src/Loader/BaseLoader.php b/src/Loader/BaseLoader.php
index de27465..1ae6ba9 100644
--- a/src/Loader/BaseLoader.php
+++ b/src/Loader/BaseLoader.php
@@ -2,6 +2,7 @@
 
 namespace NAL\Dotenv\Loader;
 
+use NAL\Dotenv\Exceptions\UnableToOpenFileException;
 use NAL\Dotenv\Parser\ParserInterface;
 use NAL\Dotenv\PathResolver;
 
@@ -54,7 +55,15 @@ protected function getDefaultFile(): string
      */
     protected function resolveFiles(): array
     {
-        return array_map(fn ($file) => $this->resolver->resolve($file), $this->files);
+        return array_map(function ($file) {
+            $file = $this->resolver->resolve($file);
+
+            if (!is_file($file) || !is_readable($file)) {
+                throw new UnableToOpenFileException($file);
+            }
+
+            return $file;
+        }, $this->files);
     }
 
     /**
diff --git a/src/Loader/DotenvLoader.php b/src/Loader/DotenvLoader.php
index dd84624..3dd6c79 100644
--- a/src/Loader/DotenvLoader.php
+++ b/src/Loader/DotenvLoader.php
@@ -43,7 +43,7 @@ public function load(): array
             $handle = @fopen($file, 'r');
 
             if ($handle === false) {
-                throw new UnableToOpenFileException($file);
+                throw new UnableToOpenFileException($file); // @codeCoverageIgnore
             }
 
             $contents = fread($handle, filesize($file));
diff --git a/src/Loader/JsonLoader.php b/src/Loader/JsonLoader.php
index a8c6f96..b2e84af 100644
--- a/src/Loader/JsonLoader.php
+++ b/src/Loader/JsonLoader.php
@@ -46,7 +46,7 @@ public function load(): array
             $handle = @fopen($file, 'r');
 
             if ($handle === false) {
-                throw new UnableToOpenFileException($file);
+                throw new UnableToOpenFileException($file); // @codeCoverageIgnore
             }
 
             $content = fread($handle, filesize($file));
diff --git a/src/PathResolver.php b/src/PathResolver.php
index b359b53..90f2af8 100644
--- a/src/PathResolver.php
+++ b/src/PathResolver.php
@@ -107,6 +107,10 @@ public static function isAbsolute(string $path): bool
      */
     public static function normalize(string $path): string
     {
+        if (self::isAbsolute($path)) {
+            return str_replace(['/', '\\'], self::DS, $path);
+        }
+
         return trim(str_replace(['/', '\\'], self::DS, $path), self::DS);
     }
 }
diff --git a/tests/EnvTest.php b/tests/EnvTest.php
index fc30c7e..f63772d 100644
--- a/tests/EnvTest.php
+++ b/tests/EnvTest.php
@@ -146,6 +146,15 @@ public function testThrowExceptionIfEnvFileNotFound()
         $env->load();
     }
 
+    public function testEnvFileLoadWithCustomPath()
+    {
+        $file = $this->createEnvFile('.env', "FOO=bar\n");
+
+        $env = Env::create(loader: new DotenvLoader('.env', resolver: new PathResolver($this->dir)));
+
+        $this->assertSame('bar', $env->get('FOO'));
+    }
+
     public function testThrowExceptionEnvLoadWithGuessLoaderForUnregisteredFileType()
     {
         $file = $this->createEnvFile('env.txt', "APP_TEST=true");