[英]How can I check a specific mocked instance is passed using JMockit?
I want to test the following code 我想测试以下代码
BufferedReader reader = new BufferedReader(new FileReader(args[0]));
If I write a test like this, it works 如果我写这样的测试,那就行得通
@Mocked FileReader fileReader;
@Mocked BufferedReader bufferedReader;
//...
new NonStrictExpectations() {{
new FileReader("filename"); times = 1;
new BufferedReader(withAny(fileReader)); times = 1;
}};
However, this test does not make sure that the create FileReader is passed to the ctor of BufferedReader, only that a FileReader gets passed. 然而,本次测试没有请确保创建的FileReader传递到BufferedReader类的构造函数,只有一个的FileReader被传递。
What I actually want is for the last line to be 我真正想要的是最后一行
new BufferedReader(withSameInstance(fileReader)); times = 1;
Unfortunately this doesn't work, as JMockit complains that the ctor of BufferedReader is never called with the specified argument... 不幸的是,这是行不通的,因为JMockit抱怨BufferedReader的ctor从来没有使用指定的参数来调用...
I tried using @Captured on the fileReader but that didn't work either... 我尝试在fileReader上使用@Captured,但是那也不起作用...
The ability that @Capturing
mock fields had of getting new
-ed instances assigned to them was removed in JMockit 1.6, in an attempt to simplify the API. 为了简化API,在JMockit 1.6中删除了
@Capturing
模拟字段获取分配给它们的new
-ed实例的功能。
With the current API (JMockit 1.6 & 1.7) you can still achieve the desired effect, in one of two ways: 使用当前的API(JMockit 1.6和1.7),您仍然可以通过以下两种方式之一实现所需的效果:
@Mocked FileReader fileReader;
@Mocked BufferedReader bufferedReader;
FileReader capturedReader;
@Test
public void mockIOClasses() throws Exception {
new NonStrictExpectations() {{
new FileReader("filename");
result = new Delegate() {
void captureIt(Invocation inv) {
capturedReader = inv.getInvokedInstance();
}
};
times = 1;
new BufferedReader(with(new Delegate<Reader>() {
void check(Reader in) { assertSame(capturedReader, in); }
}));
times = 1;
}};
new BufferedReader(new FileReader("filename"));
}
@Test
public void mockIOClasses2() throws Exception
{
new NonStrictExpectations() {{
new FileReader("filename");
result = new Delegate() {
void captureIt(Invocation inv) {
capturedReader = inv.getInvokedInstance();
}
};
}};
new BufferedReader(new FileReader("filename"));
new Verifications() {{
FileReader r;
new BufferedReader(r = withCapture());
assertSame(capturedReader, r);
}};
}
This said, however, I would recommend to avoid mocking the JRE IO classes. 这就是说,但是,我建议避免模拟JRE IO类。 Both tests above are too tightly coupled to implementations details.
上面的两个测试都与实现细节紧密联系在一起。 The best approach is to just use a real file;
最好的方法是只使用一个真实的文件。 you should be able to use a small test file (in the "test" source dir) here, perhaps creating it as a temporary file in the test itself.
您应该可以在此处使用一个小的测试文件(在“ test”源目录中),也许可以在测试本身中将其创建为临时文件。
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