AssertJ在原因消息上断言

Question

有没有办法在使用AssertJ时再次抛出一个方法来检查原因中的消息是否等于某个字符串.

我目前正在做类似的事情:

assertThatThrownBy(() -> SUT.method())
            .isExactlyInstanceOf(IllegalStateException.class)
            .hasRootCauseExactlyInstanceOf(Exception.class);

并且想添加一个断言来检查根本原因中的消息.

Answer 1

不完全是,目前你能做的最好的就是使用hasStackTraceContaining,例如

Throwable runtime = new RuntimeException("no way", 
                                         new Exception("you shall not pass"));

assertThat(runtime).hasCauseInstanceOf(Exception.class)
                   .hasStackTraceContaining("no way")
                   .hasStackTraceContaining("you shall not pass");

Answer 2

自 AssertJ 3.16 起，有两个新选项可用：

• getCause()：

Throwable runtime = new RuntimeException("no way", 
                                         new Exception("you shall not pass"));

assertThat(runtime).getCause()
                   .hasMessage("you shall not pass");

• getRootCause()：

Throwable rootCause = new RuntimeException("go back to the shadow!");
Throwable cause = new Exception("you shall not pass", rootCause);
Throwable runtime = new RuntimeException("no way", cause);

assertThat(runtime).getRootCause()
                   .hasMessage("go back to the shadow!");

自 AssertJ 3.14 起，可以使用extractingwith InstanceOfAssertFactory：

Throwable runtime = new RuntimeException("no way", 
                                         new Exception("you shall not pass"));

assertThat(runtime).extracting(Throwable::getCause, as(THROWABLE))
                   .hasMessage("you shall not pass");

as()静态导入自org.assertj.core.api.Assertions和THROWABLE静态导入自org.assertj.core.api.InstanceOfAssertFactories.