不完全是这样，目前最好的方法是使用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");

自AssertJ 3.16起，提供了两个新选项：

• 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，extracting可以与InstanceOfAssertFactory一起使用：

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()是从org.assertj.core.api.Assertions静态导入的，THROWABLE是从org.assertj.core.api.InstanceOfAssertFactories静态导入的。