diff --git a/.gitignore b/.gitignore
index de4a392..8cab567 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /vendor
 /composer.lock
+.idea
diff --git a/composer.json b/composer.json
index 61bf3d6..a75a72c 100644
--- a/composer.json
+++ b/composer.json
@@ -17,5 +17,18 @@
 		"nette/neon": "~2.3",
 		"latte/latte": "~2.3"
 	},
+	"require-dev": {
+		"nette/tester": "1.4.0"
+	},
+	"autoload": {
+		"classmap": [
+			"src/"
+		]
+	},
+	"autoload-dev": {
+		"classmap": [
+			"tests/"
+		]
+	},
 	"bin": ["src/code-checker.php"]
 }
diff --git a/src/CodeCheckers/EntityChecker.php b/src/CodeCheckers/EntityChecker.php
new file mode 100644
index 0000000..29716e0
--- /dev/null
+++ b/src/CodeCheckers/EntityChecker.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace CodeCheckers;
+
+use Nette\Object;
+use Nette\Utils\Strings;
+
+
+
+class EntityChecker extends Object
+{
+
+	public static function createAnnotationsChecker()
+	{
+		return function ($checker, $s) {
+			if (!$checker->is('php')) {
+				return;
+			}
+
+			if (Strings::contains($s, '@ORM\Entity') && !Strings::contains($s, '@ORM\Entity(')) {
+				$checker->fix('Missing Entity`()`');
+				$s = str_replace('@ORM\Entity', '@ORM\Entity()', $s);
+			}
+
+			if (Strings::contains($s, '@ORM\Table()')) {
+				$checker->fix('Missing `name="table_name"`');
+				$s = str_replace('@ORM\Table()', '@ORM\Table(name="")', $s);
+			}
+
+			if (Strings::contains($s, '@ORM\Table') && !Strings::contains($s, '@ORM\Table(')) {
+				$checker->fix('Missing `name="table_name"`');
+				$s = str_replace('@ORM\Table', '@ORM\Table(name="")', $s);
+			}
+
+			return $s;
+		};
+	}
+}
diff --git a/src/CodeCheckers/Html5Checker.php b/src/CodeCheckers/Html5Checker.php
new file mode 100644
index 0000000..d383dd1
--- /dev/null
+++ b/src/CodeCheckers/Html5Checker.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace CodeCheckers;
+
+use Nette\Object;
+use Nette\Utils\Strings;
+
+
+
+class Html5Checker extends Object
+{
+
+	public static function createHtml5CheckerChecker()
+	{
+		return function ($checker, $s) {
+			if (!$checker->is('latte')) {
+				return;
+			}
+
+			if (Strings::match($s, '#<br\W*?\/>#')) {
+				$checker->error('contains XHTML');
+			}
+		};
+	}
+}
diff --git a/src/CodeCheckers/LineLengthChecker.php b/src/CodeCheckers/LineLengthChecker.php
new file mode 100644
index 0000000..a9275ea
--- /dev/null
+++ b/src/CodeCheckers/LineLengthChecker.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace CodeCheckers;
+
+use Nette\Object;
+use Nette\Utils\Strings;
+
+
+
+class LineLengthChecker extends Object
+{
+
+	public static function createLineLengthChecker($warningLineLength = 140, $errorLineLength = 210)
+	{
+		return function ($checker, $s) use ($warningLineLength, $errorLineLength) {
+			if (!$checker->is('php') && !$checker->is('phpt')) {
+				return;
+			}
+
+			$i = 0;
+			foreach (explode("\n", $s) as $line) {
+				$i++;
+				$line = str_replace("\t", str_repeat(' ', 4), $line);
+				$lineLength = Strings::length($line);
+				$message = sprintf('Line %s have %d characters', Strings::truncate(Strings::trim($line), 30), $lineLength);
+
+				if ($lineLength > $errorLineLength) {
+					$checker->error($message, $i);
+					continue;
+				}
+				if ($warningLineLength !== NULL && $lineLength > $warningLineLength) {
+					$checker->warning($message, $i);
+				}
+			}
+		};
+	}
+}
diff --git a/src/CodeCheckers/NeonChecker.php b/src/CodeCheckers/NeonChecker.php
new file mode 100644
index 0000000..4d96a7c
--- /dev/null
+++ b/src/CodeCheckers/NeonChecker.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace CodeCheckers;
+
+use Nette\Object;
+
+
+
+class NeonChecker extends Object
+{
+
+	public static function createBooleanValuesChecker()
+	{
+		return function ($checker, $s) {
+			if (!$checker->is('neon')) {
+				return;
+			}
+
+			$lines = explode("\n", $s);
+			foreach ($lines as &$line) {
+				if (preg_match('~^(.*):( )?(yes|on|no|off)$~i', $line)) {
+					$message = sprintf('Boolean values should be true/false: %s', $line);
+					$checker->fix($message);
+					$line = preg_replace('~:( )?(yes|on)$~i', ': true', $line);
+					$line = preg_replace('~:( )?(no|off)$~i', ': false', $line);
+				}
+			}
+
+			return implode("\n", $lines);
+		};
+	}
+}
diff --git a/src/code-checker.php b/src/code-checker.php
old mode 100644
new mode 100755
index 06f7d17..62f5ddc
--- a/src/code-checker.php
+++ b/src/code-checker.php
@@ -6,10 +6,19 @@
  * This file is part of the Nette Framework (https://nette.org)
  */
 
-use Nette\Utils\Strings;
+use CodeCheckers\EntityChecker;
+use CodeCheckers\LineLengthChecker;
+use CodeCheckers\Html5Checker;
+use CodeCheckers\NeonChecker;
 use Nette\CommandLine\Parser;
+use Nette\Utils\Strings;
+
+$loaders = array_filter([
+	__DIR__ . '/../vendor/autoload.php',
+	__DIR__ . '/../../../autoload.php',
+], 'file_exists');
 
-if (@!include __DIR__ . '/../vendor/autoload.php') {
+if (@!include reset($loaders)) {
 	echo('Install packages using `composer update`');
 	exit(1);
 }
@@ -373,6 +382,27 @@ public function is($extensions)
 	}
 };
 
+// cs, missing @testCase in phpt files
+$checker->tasks[] = function (CodeChecker $checker, $s) {
+	if ($checker->is('phpt')) {
+		if (!Strings::contains($s, ' * @testCase')) {
+			$checker->error('Missing @testCase');
+		}
+	}
+};
+
+// cs, entity
+$checker->tasks[] = EntityChecker::createAnnotationsChecker();
+
+//max line length
+$checker->tasks[] = LineLengthChecker::createLineLengthChecker(NULL, 360);
+
+//html5 <br/>
+$checker->tasks[] = Html5Checker::createHtml5CheckerChecker();
+
+//boolean (yes, on -> true, no, off -> false)
+$checker->tasks[] = NeonChecker::createBooleanValuesChecker();
+
 $ok = $checker->run($options['-d']);
 
 exit($ok ? 0 : 1);
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..a7ffcfd
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1,3 @@
+/*/output
+/test.log
+/tmp
diff --git a/tests/CodeCheckers/EntityChecker.phpt b/tests/CodeCheckers/EntityChecker.phpt
new file mode 100644
index 0000000..a597daa
--- /dev/null
+++ b/tests/CodeCheckers/EntityChecker.phpt
@@ -0,0 +1,100 @@
+<?php
+/**
+ * @testCase
+ */
+
+namespace CodeCheckerTests;
+
+use CodeCheckers\EntityChecker;
+use Tester\Assert;
+use Tester\TestCase;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+
+class FakeChecker
+{
+
+	public $fixMessages = [];
+
+
+
+	public function fix($message)
+	{
+		$this->fixMessages[] = $message;
+	}
+
+
+
+	public function is($file)
+	{
+		return TRUE;
+	}
+}
+
+
+
+class EntityCheckerTest extends TestCase
+{
+	/**
+	 * @var FakeChecker
+	 */
+	private $fakeChecker;
+
+
+
+	public function setup()
+	{
+		$this->fakeChecker = new FakeChecker();
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestEntity
+	 */
+	public function testEntity($input, $output, $countOfFixMessages)
+	{
+		$annotationChecker = EntityChecker::createAnnotationsChecker();
+		Assert::same($output, $annotationChecker($this->fakeChecker, $input));
+		Assert::count($countOfFixMessages, $this->fakeChecker->fixMessages);
+	}
+
+
+
+	public function getDataForTestEntity()
+	{
+		return [
+			['@ORM\Entity', '@ORM\Entity()', 1],
+			['@ORM\Entity()', '@ORM\Entity()', 0],
+		];
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestTableName
+	 */
+	public function testTableName($input, $output, $countOfFixMessages)
+	{
+		$annotationChecker = EntityChecker::createAnnotationsChecker();
+		Assert::same($output, $annotationChecker($this->fakeChecker, $input));
+		Assert::count($countOfFixMessages, $this->fakeChecker->fixMessages);
+	}
+
+
+
+	public function getDataForTestTableName()
+	{
+		return [
+			['@ORM\Table()', '@ORM\Table(name="")', 1],
+			['@ORM\Table', '@ORM\Table(name="")', 1],
+			['@ORM\Table(name="table_name")', '@ORM\Table(name="table_name")', 0],
+		];
+	}
+}
+
+
+
+\run(new EntityCheckerTest());
diff --git a/tests/CodeCheckers/Html5Checker.phpt b/tests/CodeCheckers/Html5Checker.phpt
new file mode 100644
index 0000000..b6c93f2
--- /dev/null
+++ b/tests/CodeCheckers/Html5Checker.phpt
@@ -0,0 +1,106 @@
+<?php
+
+/**
+ * @testCase
+ */
+
+namespace DamejidloTests;
+
+use CodeCheckers\Html5Checker;
+use Nette;
+use Tester;
+use Tester\Assert;
+
+require_once __DIR__ . '/../bootstrap.php';
+
+
+
+class FakeChecker
+{
+
+	public $errors = [];
+
+
+
+	public function error($message)
+	{
+		$this->errors[] = $message;
+	}
+
+
+
+	public function is($file)
+	{
+		return TRUE;
+	}
+}
+
+
+
+class Html5CheckerTest extends Tester\TestCase
+{
+
+	/**
+	 * @var FakeChecker
+	 */
+	private $fakeChecker;
+
+
+
+	public function setup()
+	{
+		$this->fakeChecker = new FakeChecker();
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestPass
+	 */
+	public function testPass($s)
+	{
+		$html5Checker = Html5Checker::createHtml5CheckerChecker();
+		$html5Checker($this->fakeChecker, $s);
+		Assert::count(0, $this->fakeChecker->errors);
+	}
+
+
+
+	public function getDataForTestPass()
+	{
+		return [
+			[NULL],
+			['<p>lol<br></p>'],
+			['<br>lol<br><br>'],
+		];
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestFail
+	 */
+	public function testFail($s)
+	{
+		$html5Checker = Html5Checker::createHtml5CheckerChecker();
+		$html5Checker($this->fakeChecker, $s);
+		Assert::count(1, $this->fakeChecker->errors);
+	}
+
+
+
+	public function getDataForTestFail()
+	{
+		return [
+			['lol<br><br/>'],
+			['<p>lol<br/></p>'],
+			['<br>lol<br><br />'],
+			["<br \t/>"],
+			["<br\n/>"],
+		];
+	}
+}
+
+
+
+\run(new Html5CheckerTest());
diff --git a/tests/CodeCheckers/LineLengthChecker.phpt b/tests/CodeCheckers/LineLengthChecker.phpt
new file mode 100644
index 0000000..6abef3f
--- /dev/null
+++ b/tests/CodeCheckers/LineLengthChecker.phpt
@@ -0,0 +1,179 @@
+<?php
+
+/**
+ * @testCase
+ */
+
+namespace DamejidloTests;
+
+use CodeCheckers\LineLengthChecker;
+use Nette;
+use Tester;
+use Tester\Assert;
+
+require_once __DIR__ . '/../bootstrap.php';
+
+
+
+class FakeChecker
+{
+
+	public $warning = [];
+	public $error = [];
+
+
+
+	public function warning($message)
+	{
+		$this->warning[] = $message;
+	}
+
+
+
+	public function error($message)
+	{
+		$this->error[] = $message;
+	}
+
+
+
+	public function is($file)
+	{
+		return TRUE;
+	}
+}
+
+
+
+class LineLengthCheckerTest extends Tester\TestCase
+{
+
+	/**
+	 * @var FakeChecker
+	 */
+	private $fakeChecker;
+
+
+
+	public function setup()
+	{
+		$this->fakeChecker = new FakeChecker();
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestTooLengthFiles
+	 */
+	public function testTooLengthFiles($s, $countOfMessages)
+	{
+		$checker = LineLengthChecker::createLineLengthChecker(30);
+
+		$checker($this->fakeChecker, $s);
+		Assert::count($countOfMessages, $this->fakeChecker->warning);
+		foreach ($this->fakeChecker->warning as $message) {
+			Assert::match('%A%have%A%characters', $message);
+		}
+	}
+
+
+
+	public function getDataForTestTooLengthFiles()
+	{
+		$s = str_repeat('a', 32);
+
+		return [
+			[$s, 1],
+			["\n\n\n\n$s\n$s", 2],
+			["foo\nbar\nfoo\n$s\n$s\n$s", 3],
+			["__construct(foo$s,$s", 1],
+		];
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestPass
+	 */
+	public function testPass($s)
+	{
+		$checker = LineLengthChecker::createLineLengthChecker(30);
+
+		$checker($this->fakeChecker, $s);
+		Assert::count(0, $this->fakeChecker->warning);
+	}
+
+
+
+	public function getDataForTestPass()
+	{
+		$s = str_repeat('a', 15);
+
+		return [
+			[$s],
+			["\n\n\n\n$s\n$s"],
+			["foo\nbar\nfoo\n$s\n$s\n$s"],
+		];
+	}
+
+
+
+	public function testTabsToSpaces()
+	{
+		$checker = LineLengthChecker::createLineLengthChecker(10);
+
+		$checker($this->fakeChecker, "\t\t");
+		Assert::count(0, $this->fakeChecker->warning);
+
+		$checker($this->fakeChecker, "\t\t\t"); //3 tabs = 12 characters
+		Assert::count(1, $this->fakeChecker->warning);
+
+		foreach ($this->fakeChecker->warning as $message) {
+			Assert::match('%A%have%A%characters', $message);
+		}
+	}
+
+
+	public function testErrorAndWarning()
+	{
+		$checker = LineLengthChecker::createLineLengthChecker(10, 20);
+		$warningLine = str_repeat('a', 12);
+		$errorLine = str_repeat('a', 22);
+
+		Assert::count(0, $this->fakeChecker->warning);
+		Assert::count(0, $this->fakeChecker->error);
+
+		$checker($this->fakeChecker, $warningLine);
+		Assert::count(1, $this->fakeChecker->warning);
+		Assert::count(0, $this->fakeChecker->error);
+
+		$checker($this->fakeChecker, $errorLine);
+		Assert::count(1, $this->fakeChecker->warning);
+		Assert::count(1, $this->fakeChecker->error);
+	}
+
+
+
+	public function testDisableWarning()
+	{
+		$checker = LineLengthChecker::createLineLengthChecker(NULL, 20);
+		$warningLine = str_repeat('a', 12);
+		$errorLine = str_repeat('a', 22);
+
+		Assert::count(0, $this->fakeChecker->warning);
+		Assert::count(0, $this->fakeChecker->error);
+
+		$checker($this->fakeChecker, $warningLine);
+		Assert::count(0, $this->fakeChecker->warning); //zero, disabled warning
+		Assert::count(0, $this->fakeChecker->error);
+
+		$checker($this->fakeChecker, $errorLine);
+		Assert::count(0, $this->fakeChecker->warning);
+		Assert::count(1, $this->fakeChecker->error);
+	}
+
+}
+
+
+
+\run(new LineLengthCheckerTest());
diff --git a/tests/CodeCheckers/NeonChecker.phpt b/tests/CodeCheckers/NeonChecker.phpt
new file mode 100644
index 0000000..5e41984
--- /dev/null
+++ b/tests/CodeCheckers/NeonChecker.phpt
@@ -0,0 +1,119 @@
+<?php
+/**
+ * @testCase
+ */
+
+namespace CodeCheckerTests;
+
+use CodeCheckers\NeonChecker;
+use Tester\Assert;
+use Tester\TestCase;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+
+class FakeChecker
+{
+
+	public $fixMessages = [];
+
+
+
+	public function fix($message)
+	{
+		$this->fixMessages[] = $message;
+	}
+
+
+
+	public function is($file)
+	{
+		return TRUE;
+	}
+}
+
+
+
+class NeonCheckerTest extends TestCase
+{
+
+	/**
+	 * @var FakeChecker
+	 */
+	private $fakeChecker;
+
+	/**
+	 * @var array
+	 */
+	private $input = [
+		'common:
+	php:
+		include_path: %libsDir%
+		date.timezone: Europe/Prague
+		auto_detect_line_endings: no
+		# zlib.output_compression: yes
+',
+		'common:
+	php:
+		include_path: %libsDir%
+		date.timezone: Europe/Prague
+		auto_detect_line_endings: true
+		# zlib.output_compression: true
+',
+	];
+
+	/**
+	 * @var array
+	 */
+	private $output = [
+		'common:
+	php:
+		include_path: %libsDir%
+		date.timezone: Europe/Prague
+		auto_detect_line_endings: false
+		# zlib.output_compression: true
+',
+		'common:
+	php:
+		include_path: %libsDir%
+		date.timezone: Europe/Prague
+		auto_detect_line_endings: true
+		# zlib.output_compression: true
+',
+	];
+
+
+
+	public function setup()
+	{
+		$this->fakeChecker = new FakeChecker();
+	}
+
+
+
+	/**
+	 * @dataProvider getDataForTestBooleanValues
+	 */
+	public function testBooleanValues($input, $output, $countOfFixMessages)
+	{
+		$booleanValuesChecker = NeonChecker::createBooleanValuesChecker();
+		Assert::same($output, $booleanValuesChecker($this->fakeChecker, $input));
+		Assert::count($countOfFixMessages, $this->fakeChecker->fixMessages);
+	}
+
+
+
+	public function getDataForTestBooleanValues()
+	{
+		return [
+			[$this->input[0], $this->output[0], 2],
+			[$this->input[1], $this->output[1], 0],
+		];
+	}
+
+}
+
+
+
+\run(new NeonCheckerTest());
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..87b48f5
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,34 @@
+<?php
+
+if (@!include __DIR__ . '/../vendor/autoload.php') {
+	echo 'Install Nette Tester using `composer install`';
+	exit(1);
+}
+
+Tester\Environment::setup();
+date_default_timezone_set('Europe/Prague');
+
+// create temporary directory
+define('TEMP_DIR', __DIR__ . '/tmp/' . getmypid());
+@mkdir(dirname(TEMP_DIR)); // @ - directory may already exist
+Tester\Helpers::purge(TEMP_DIR);
+
+function before(\Closure $function = NULL)
+{
+	static $val;
+	if (!func_num_args()) {
+		return ($val ? $val() : NULL);
+	}
+	$val = $function;
+}
+
+function test(\Closure $function)
+{
+	before();
+	$function();
+}
+
+function run(Tester\TestCase $testCase)
+{
+	$testCase->run(isset($_SERVER['argv'][1]) ? $_SERVER['argv'][1] : NULL);
+}