单元测试-黑和测试-等价测试用例 示意

定义一个简单的功能要求，判断三角形是等边/等腰/一般三角形，要求边长在（1，100）范围；

准备测试代码

require_once("./triangle.class.php");  

function runTest($a, $b, $c){
    $triangle = new triangle($a, $b, $c);
    echo $triangle->getSahpe() . '</br>';
}

准备黑盒等价测试用例

同测试结果图

开发功能代码

<?php

class triangle {

    protected $a;
    protected $b;
    protected $c;
    protected $errArray = array(
        100 => '不能为空',
        101 => '必须是数字',
        102 => '必须大于1',
        103 => '必须小于100',
        104 => '2边之和必须大于第三边'
    );
    protected $shapes = array(
        's101' => '等边三角形',
        's102' => '等腰三角形',
        's103' => '一般三角形',
    );
    protected $return = null;

    public function __construct($a, $b, $c) {
        $this->a = $a;
        $this->b = $b;
        $this->c = $c;
        
        $this->_checkEdge($a, 'a');
        if(!$this->return){
            $this->_checkEdge($b, 'b');
        }
        if(!$this->return){          
            $this->_checkEdge($c, 'c');
        }
        if(!$this->return){
            $this->_checkEdges($a, $b, $c);
        }
        
        if(!$this->return){
            $this->_getShape();
        }
    }
    
    //检查三遍长度是否合法
    protected function _checkEdge($param, $edge) {
        if (empty($param)) {
            $this->return = '边长' . $edge . $this->errArray[100];
        } elseif (!is_numeric($param)) {
            $this->return = '边长' . $edge . $this->errArray[101];
        } elseif ($param <= 1) {
            $this->return = '边长' . $edge . $this->errArray[102];
        } elseif ($param >= 100) {
            $this->return = '边长' . $edge . $this->errArray[103];
        }

        return true;
    }
    
    //检查三边之和
    protected function _checkEdges($param1, $param2, $param3) {
        $d1 = $param1 + $param2;
        $d2 = $param1 + $param3;
        $d3 = $param3 + $param2;

        if (($d1 <= $param3) || ($d2 <= $param2) || ($d3 <= $param1)) {
            $this->return = $this->errArray[104];
        }

        return true;
    }

    //判断形状
    protected function _getShape() {
        if (($this->a == $this->b) && ($this->b == $this->c)) {
            $this->return = $this->shapes['s101'];
        } elseif (($this->a == $this->b) || ($this->a == $this->c) || ($this->c == $this->b)) {
            $this->return = $this->shapes['s102'];
        } else {
            $this->return = $this->shapes['s103'];
        }
    }

    //获取判断
    public function getSahpe() {
        return $this->return;
    }

}

测试结果