diff --git a/phpstan.neon b/phpstan.neon
index c68958d..a0554d6 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,3 +4,4 @@ parameters:
 
 	paths:
 		- src
+		- tests
diff --git a/tests/GitPhp/bootstrap.php b/tests/GitPhp/bootstrap.php
index cbf8934..435374c 100644
--- a/tests/GitPhp/bootstrap.php
+++ b/tests/GitPhp/bootstrap.php
@@ -5,8 +5,10 @@
 
 Tester\Environment::setup();
 
-
-function test($cb)
+/**
+ * @return void
+ */
+function test(callable $cb)
 {
 	try {
 		$cb();
diff --git a/tests/libs/AssertRunner.php b/tests/libs/AssertRunner.php
index 9dbb457..db7d1e2 100644
--- a/tests/libs/AssertRunner.php
+++ b/tests/libs/AssertRunner.php
@@ -16,7 +16,7 @@ class AssertRunner implements \CzProject\GitPhp\IRunner
 		/** @var CommandProcessor */
 		private $commandProcessor;
 
-		/** @var array  [command => RunnerResult] */
+		/** @var RunnerResult[] */
 		private $asserts = [];
 
 
@@ -30,6 +30,14 @@ public function __construct($cwd)
 		}
 
 
+		/**
+		 * @param  mixed[] $expectedArgs
+		 * @param  array<string, scalar> $expectedEnv
+		 * @param  string[] $resultOutput
+		 * @param  string[] $resultErrorOutput
+		 * @param  int $resultExitCode
+		 * @return self
+		 */
 		public function assert(array $expectedArgs, array $expectedEnv = [], array $resultOutput = [], array $resultErrorOutput = [], $resultExitCode = 0)
 		{
 			$cmd = $this->commandProcessor->process('git', $expectedArgs, $expectedEnv);
@@ -38,6 +46,9 @@ public function assert(array $expectedArgs, array $expectedEnv = [], array $resu
 		}
 
 
+		/**
+		 * @return self
+		 */
 		public function resetAsserts()
 		{
 			$this->asserts = [];