assertThatThrownBy() 检查自定义异常的字段

Question

如何使用assertJ 检查自定义异常中的特定字段值？

这是异常类：

public class SomeException extends RuntimeException {
    private final Set<Integer> something;

    public SomeException (String message, Set<Integer> something) {
        super(message);

        this.something = something;
    }

    public Set<Integer> getSomething() {
        return something;
    }
}

这是我的测试：

    assertThatThrownBy(() -> service.doSomething())
        .isInstanceOf(SomeException.class)
        .hasMessageStartingWith("SomeException has 1,2,3,4 in something field. I want assert that")
        . ??? check that SomeException.getSomething() has 1,2,3,4 ???

问题是，如果我链接extracting() ，它会认为我正在使用Throwable。所以我无法提取字段内容

更新：

SomeException throwable = (SomeException) catchThrowable(() -> service.doSomething(

assertThat(throwable)
    .hasMessageStartingWith("extracting() bellow still think we're working with Throwable")
    .extracting(SomeException::getSomething <<<--- doesn't work here)

我已经尝试过以下建议，如下所示：

 assertThat(throwable)
        .hasMessageStartingWith("Works except containsExactlyInAnyOrder()")
        .asInstanceOf(InstanceOfAssertFactories.type(SomeException.class))
        .extracting(SomeException::getSomething)
        .->>>containsExactlyInAnyOrder<<<--- Not working!!!

但我不能再使用containsExactlyInAnyOrder () :(

请指教

Answer 1

看起来您正在寻找catchThrowableOfType，它可以让您收到正确的课程：

import static org.assertj.core.api.Assertions.catchThrowableOfType;

SomeException throwable = catchThrowableOfType(() -> service.doSomething(), SomeException.class);

assertThat(throwable.getSomething()).isNotNull();

Answer 2

有很多变体extracting，您想要使用的是extracting(String)，例如：

   assertThatThrownBy(() -> service.doSomething())
        .isInstanceOf(SomeException.class)
        .hasMessageStartingWith("SomeException ... ")
        .extracting("something")
        .isEqualTo(1,2,3,4);

用于extracting(String, InstanceOfAssertFactory)获取专门的断言，因此如果该值是一个集合，您可以尝试：

   assertThatThrownBy(() -> service.doSomething())
        .isInstanceOf(SomeException.class)
        .hasMessageStartingWith("SomeException ... ")
        .extracting("something", InstanceOfAssertFactories.ITERABLE)
        .contains();

您还可以尝试：hasFieldOrPropertyWithValue

更新：工作示例

SomeException throwable = new SomeException("foo", Sets.newSet(1, 2, 3, 4));

assertThat(throwable).hasMessageStartingWith("fo")
                     .extracting("something", InstanceOfAssertFactories.ITERABLE)
                     .containsExactly(1, 2, 3, 4);