java - 有没有办法让 never() +startsWith() 匹配器报告匹配的内容？

Question

我有这个:

verify(logger, never()).info(startsWith("Created content from "));

错误信息是这样的:

org.mockito.exceptions.verification.NeverWantedButInvoked: 
logger.info(
    startsWith("Created content from ")
);

因为我使用的是 startsWith，所以了解完整的字符串对于调试此故障非常有帮助。有什么方法可以获取该字符串吗？

Answer 1

我认为您可以做到这一点的唯一方法是编写您自己的匹配器。您可以在自己的实用程序类中添加一个返回匹配器的方法，例如...

public class CustomMatchers {
    public static String capturingStartsWith(final String expected) {
        return Mockito.argThat(new TypeSafeMatcher<String>() {

            private String actual;

            @Override
            public void describeTo(Description description) {
                description.appendText("String that starts with: ");
                description.appendValue(expected);
                description.appendText(" actual: ");
                description.appendValue(actual);
            }

            @Override
            protected boolean matchesSafely(String actual) {
                this.actual = actual;
                return actual.startsWith(expected);
            }
        });
    }
}

然后你的测试...

import static CustomMatchers.*;
...
@Test
public void shouldNotDoWhatItDoesNow() {
    classUnderTest.doStuff();

    verify(logger, never()).info(capturingStartsWith("Created content from"));
}

这会给你这样的输出......

org.mockito.exceptions.verification.NeverWantedButInvoked: 
logger.info(
    Start that starts with: "Created content from" actual: "Created content from [WIBBLE]"
);
Never wanted here:
-> at  CustomStartsWithTest.shouldNotDoWhatItDoesNow(CustomStartsWithTest.java:28)
But invoked here:
-> at CustomStartsWith.doStuff(CustomStartsWith.java:12)

(不将类型安全匹配器包装在辅助方法中的“argThat”中并返回 Matcher 可能会更优雅)

我不知道有任何免费库有这样的额外匹配器。可能有一种更聪明的方法来破解 Mockito 来为你做到这一点......