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                            [TOC]

## 測試原則
當需要對值進行比較時,使用`equa?`進行測試。

## 實例
```
(define (add x y)
  (+ x y))
(define (test-add func-res hope-res)
  (cond
    [(equal? hope-res func-res) true]
    [else (error 'test-add "run is error func result is " func-res " expected is " hope-res)]))

(test-add (add 1 2) 3) ;#true
(test-add (add 1 2) 4) ;test-add: run is error func result is 3 expected is 4
```
equal? 可以對任何類型類型進行比較
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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