add unit test case

Author: wujunze

README.md

@@ -4,6 +4,7 @@ Simple and easy to use the PHP command-line output of color
 
 
 [![Build Status](https://travis-ci.org/wujunze/php-cli-color.svg?branch=master)](https://travis-ci.org/wujunze/php-cli-color)
+[![codecov](https://codecov.io/gh/wujunze/php-cli-color/branch/master/graph/badge.svg)](https://codecov.io/gh/wujunze/php-cli-color)
 
 ## Installation
 

tests/ColorTest/CliColorTest.php

@@ -21,4 +21,17 @@ public function testCliColor()
         $this->assertEquals('Testing Colors class, this is purple string on yellow background.', $res);
     }
 
+    public function testGetBackgroundColors()
+    {
+        $color = $this->createServer();
+        $colors = $color->getBackgroundColors();
+        $this->assertNotEmpty($colors);
+    }
+
+    public function testGetForegroundColors(){
+        $color = $this->createServer();
+        $colors = $color->getForegroundColors();
+        $this->assertNotEmpty($colors);
+    }
+
 }