Add unit test

Author: genintho

test/Github/Tests/Api/UserTest.php

@@ -20,6 +20,22 @@ public function shouldShowUser()
         $this->assertEquals($expectedArray, $api->show('l3l0'));
     }
 
+    /**
+     * @test
+     */
+    public function shouldShowByIdUser()
+    {
+        $expectedArray = ['id' => 1, 'username' => 'l3l0'];
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('/user/1')
+            ->will($this->returnValue($expectedArray));
+
+        $this->assertEquals($expectedArray, $api->showById(1));
+    }
+
     /**
      * @test
      */