diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..53235e5
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,31 @@
+sudo: false
+
+dist: trusty
+
+language: php
+
+php:
+  - nightly
+  - 7.2
+  - 7.1
+  - 7.0
+  - 5.6
+  - 5.5
+  - 5.4
+
+matrix:
+  allow_failures:
+    - php: nightly
+  include:
+    - php: "5.3"
+      dist: precise
+
+before_script:
+  - composer install --no-interaction
+
+script:
+  - composer cover
+  - composer check-style
+
+after_script:
+  - composer coveralls
diff --git a/composer.json b/composer.json
index c00ca5a..94423b4 100644
--- a/composer.json
+++ b/composer.json
@@ -13,9 +13,21 @@
     "require": {
         "php": "^5.3|^7.0"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8 | ^6.5",
+        "satooshi/php-coveralls": ">=0.7.1 <2.0",
+        "squizlabs/php_codesniffer": "^2.3"
+    },
     "autoload": {
         "psr-4": {
-            "Dorantor\\" : "src"
+            "Dorantor\\" : ["src/", "tests/"]
         }
+    },
+    "scripts": {
+        "test": "./vendor/bin/phpunit -c ./tests/phpunit.xml",
+        "cover": "./vendor/bin/phpunit -c ./tests/phpunit.xml --coverage-clover build/logs/clover.xml",
+        "coveralls": "coveralls -v",
+        "check-style": "./vendor/bin/phpcs -p --standard=PSR2 --runtime-set ignore_errors_on_exit 1 --runtime-set ignore_warnings_on_exit 1 src",
+        "fix-style": "./vendor/bin/phpcbf -p --standard=PSR2 --runtime-set ignore_errors_on_exit 1 --runtime-set ignore_warnings_on_exit 1 src"
     }
-}
\ No newline at end of file
+}
diff --git a/tests/FileLockTest.php b/tests/FileLockTest.php
new file mode 100644
index 0000000..8b9ff52
--- /dev/null
+++ b/tests/FileLockTest.php
@@ -0,0 +1,68 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+class FileLockTest extends TestCase {
+
+	private $fname;
+	
+    protected function setUp() 
+	{
+        parent::setUp();
+        $this->fname = 'tests/lock-test.txt';
+    }
+
+    public function testInvalidLockId() 
+	{
+        //try to catch exception from Class if the file name is incorrect
+		$f = new \Dorantor\FileLock('');
+		self::assertFalse($f->acquire());
+    }
+	
+	public function testLock()
+    {
+        $lock = new \Dorantor\FileLock($this->fname);
+
+        //try to lock file
+		self::assertTrue($lock->acquire(),'ERROR[0]: Result of function acquire() not correct!'. PHP_EOL);
+        return $lock;
+		
+    }
+
+    /**
+     * @depends     testLock
+     * @param       Dorantor\FileLock       $lock
+     */
+    public function testLockLockedFile()
+    {
+		//try to lock locked file - wait false result
+		$f = new \Dorantor\FileLock($this->fname);
+		self::assertFalse($f->acquire());
+    }	
+
+    /**
+     * @depends     testLock
+     * @param       Dorantor\FileLock       $lock
+     */
+    public function testUnlock(Dorantor\FileLock $lock)
+    {
+		//try to unlock file
+		self::assertTrue($lock->release(),'ERROR[2]: Result of function release() not correct!'. PHP_EOL);
+    }
+	
+	public function testFileUnLocked()
+    {
+		//try to read/write file after UnLocking
+		$handle = fopen($this->fname, 'a+');
+		self::assertTrue(($handle !== false),'ERROR[3]: file "'.$this->fname.'" can not be opened!'. PHP_EOL);		
+
+		//try to write
+		$fwrite_res = fwrite($handle, ''.date('d.m.Y H:i:s'). PHP_EOL);
+		self::assertNotEquals(0, $fwrite_res,'ERROR[4]: can not write to file '.$this->fname.''. PHP_EOL);
+		
+		fclose($handle);		
+		
+		$read_res = file_get_contents($this->fname, FALSE, NULL, 0, 1024);
+		self::assertNotEquals(0, strlen($read_res),'ERROR[5]: file still locked'. PHP_EOL);
+	}
+}
\ No newline at end of file
diff --git a/tests/lock-test.txt b/tests/lock-test.txt
new file mode 100644
index 0000000..495a59c
--- /dev/null
+++ b/tests/lock-test.txt
@@ -0,0 +1 @@
+test0.2018 10:00:26
\ No newline at end of file
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
new file mode 100644
index 0000000..3031c23
--- /dev/null
+++ b/tests/phpunit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+  <phpunit     colors="true"
+    bootstrap="../vendor/autoload.php"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    stopOnFailure="true"
+  >
+
+  <testsuites>
+        <testsuite name="Tests">
+            <directory suffix="Test.php">./</directory>
+        </testsuite>
+    </testsuites>
+
+  <filter>
+    <whitelist processUncoveredFilesFromWhitelist="true">
+        <directory suffix=".php">../src</directory>
+    </whitelist>
+  </filter>
+</phpunit>