diff --git a/src/Spamer/DependencyMocker/Mocker.php b/src/Spamer/DependencyMocker/Mocker.php
index f1db95d..bc04d9a 100644
--- a/src/Spamer/DependencyMocker/Mocker.php
+++ b/src/Spamer/DependencyMocker/Mocker.php
@@ -133,4 +133,22 @@ public static function getProperty($class, $property, $object)
 		$property->setAccessible(TRUE);
 		return $property->getValue($object);
 	}
+
+
+	/**
+	 * Calls private method and returns result.
+	 *
+	 * @param object $object
+	 * @param string $method
+	 * @param array $arguments
+	 * @return mixed
+	 */
+	public static function callPrivateFunction($object, $method, $arguments = [])
+	{
+		$reflectionClass = new \ReflectionClass($object);
+		$reflectionMethod = $reflectionClass->getMethod($method);
+		$reflectionMethod->setAccessible(TRUE);
+
+		return $reflectionMethod->invokeArgs($object, $arguments);
+	}
 }
\ No newline at end of file
diff --git a/tests/DependencyMocker/Mocker/CallPrivateFunction.phpt b/tests/DependencyMocker/Mocker/CallPrivateFunction.phpt
new file mode 100644
index 0000000..69e417c
--- /dev/null
+++ b/tests/DependencyMocker/Mocker/CallPrivateFunction.phpt
@@ -0,0 +1,27 @@
+<?php
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+class TestClass
+{
+	private function saltPassword($string)
+	{
+		return $string . 'salt';
+	}
+}
+
+
+
+class TestCallPrivateFunction extends \Tester\TestCase
+{
+	public function testCall()
+	{
+		$testClass = new TestClass();
+
+		$result = \Spamer\DependencyMocker\Mocker::callPrivateFunction($testClass, 'saltPassword', ['string']);
+
+		\Tester\Assert::same('stringsalt', $result);
+	}
+
+}
+(new TestCallPrivateFunction())->run();
\ No newline at end of file
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..9de0229
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,8 @@
+<?php
+
+if (@ ! include __DIR__ . '/../vendor/autoload.php') {
+	echo 'Install Nette Tester using `composer update --dev`';
+	exit(1);
+}
+
+\Tester\Environment::setup();
\ No newline at end of file