2011-11-04 140 views
0
assert !destinationDirectory: "Destination directory is required to create an archive" 

這是否意味着如果destinationDirectory爲null,它旁邊的消息應該返回AssertionError?下面的陳述是什麼意思?

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回答

2

是的。你可以通過簡單的運行測試來判斷。運行此:

assert false 

你得到:

Assertion failed: 

assert false 


    at org.codehaus.groovy.runtime.InvokerHelper.assertFailed(InvokerHelper.java:386) 
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.assertFailed(ScriptBytecodeAdapter.java:658) 
    at ConsoleScript5.run(ConsoleScript5:1) 
     .... 

然而,這樣的:

assert false: "This is false!" 

給出:

java.lang.AssertionError: This is false!. Expression: false 
    at org.codehaus.groovy.runtime.InvokerHelper.assertFailed(InvokerHelper.java:388) 
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.assertFailed(ScriptBytecodeAdapter.java:658) 
    at ConsoleScript6.run(ConsoleScript6:1) 

我找不到文件,驗證它,但我可能只是錯過了它。 It also looks like這種格式的工作原理相同:assert test, "message"