java 如何为返回对象的方法编写测试用例
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How to write a test case for a method returning object
提问by Jessie
I have a method for which the return type is object. How do I create a test case for this? How do I mention that the result should be an object?
我有一个返回类型为对象的方法。如何为此创建测试用例？我如何提到结果应该是一个对象？
e.g.:
例如：
public Expression getFilter(String expo)
{
// do something
return object;
}
回答by Simulant
try Something like this. If the return-type of your function is Objectthen replace Expressionby Object:
尝试这样的事情。如果您的函数的返回类型被Object替换Expression为Object：
//if you are using JUnit4 add in the @Test annotation, JUnit3 works without it.
//@Test
public void testGetFilter(){
try{
Expression myReturnedObject = getFilter("testString");
assertNotNull(myReturnedObject);//check if the object is != null
//checks if the returned object is of class Expression
assertTrue( true, myReturnedObject instaceof Expression);
}catch(Exception e){
// let the test fail, if your function throws an Exception.
fail("got Exception, i want an Expression");
}
}
回答by RobIII
In your example the returntype is Expression? I don't understand the question, could you elaborate?
在您的示例中，返回类型是表达式？没看懂问题，能详细点吗？
The function is even unableto return anything other than Expression (or a derived type or null). So "checking the type" would be pointless.
该函数甚至无法返回表达式（或派生类型或空值）以外的任何内容。所以“检查类型”将毫无意义。
[TestMethod()]
public void FooTest()
{
MyFoo target = new MyFoo();
Expression actual = target.getFilter();
Assert.IsNotNull(actual); //Checks for null
Assert.IsInstanceOfType(actual, typeof(Expression)); //Ensures type is Expression
}
I am assuming C# here; you haven't tagged your question nor mentioned the language in your question.
我在这里假设 C#；你没有标记你的问题，也没有提到你的问题中的语言。
