diff --git a/tests/libraries/icms/ResponseTest.php b/tests/libraries/icms/ResponseTest.php
new file mode 100644
index 000000000000..db6e8d062d5a
--- /dev/null
+++ b/tests/libraries/icms/ResponseTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace ImpressCMS\Tests\Libraries\ICMS;
+
+class ResponseTest extends \PHPUnit_Framework_TestCase {
+    
+    /**
+     * Tests Text response type
+     */
+    public function testTextResponse() {
+        $this->doDefaultResponseTypeTest('Text');
+    }
+    
+    /**
+     * Is HTTP_* constants for class defined correctly
+     */
+    public function testHTTPConstantsAvailability() {
+        $response = new \icms_response_Text();
+        
+        $class = new \ReflectionClass($response);
+        $constants = $class->getConstants();
+        
+        $this->assertNotEmpty($constants, 'Class doesn\'t have any constants');
+        
+        foreach ($constants as $name => $value) {
+            if (substr($name, 0, 5) != 'HTTP_') {
+                continue;
+            }
+            $this->assertInternalType('int', $value, $name . ' constant value must be defined as int');
+        }        
+    }
+    
+    /**
+     * Tests HTML response type
+     */     
+    public function testHTML() {
+        $this->doDefaultResponseTypeTest('HTML');
+    }    
+        
+    /**
+     * Tests JSON response type
+     */     
+    public function testJSON() {
+        $this->doDefaultResponseTypeTest('JSON');
+    }        
+    
+    /**
+     * Tests JSONP response type
+     */     
+    public function testJSONP() {
+        $this->doDefaultResponseTypeTest('JSONP');
+    }        
+    
+    /**
+     * Tests DefaultEmptyPage response type
+     */     
+    public function testDefaultEmptyPage() {
+        $this->doDefaultResponseTypeTest('DefaultEmptyPage');
+    }
+    
+    /**
+     * Tests Serialize response type
+     */     
+    public function testSerialize() {
+        $this->doDefaultResponseTypeTest('Serialize');
+    }      
+    
+    /**
+     * Tests Events response type
+     */     
+    public function testEvents() {
+        $this->doDefaultResponseTypeTest('Events');
+    }
+    
+    /**
+     * Do default type
+     * 
+     * @param string $type
+     */
+    private function doDefaultResponseTypeTest($type) {
+        $class = 'icms_response_' . $type;
+        $this->assertTrue(class_exists($class, true), $class . ' class doesn exist');
+        
+        $instance = new \ReflectionClass($class);
+        $this->assertInternalType('string', $instance->getConstant('CONTENT_TYPE'), 'CONTENT_TYPE constant must be defined as string');
+    }
+    
+}
\ No newline at end of file