ThrowableTranslatorTest.java 文件源码

@Factory
private static DiagnosingMatcher<Object> translateTo(HttpStatus status) {
    return new DiagnosingMatcher<Object>() {
        private static final String EXCEPTION = "EXCEPTION";

        @Override
        public void describeTo(final Description description) {
            description.appendText("does not translate to ").appendText(status.toString());
        }

        @SuppressWarnings("unchecked")
        protected boolean matches(final Object item, final Description mismatch) {

            if (item instanceof Class) {
                if (((Class) item).getClass().isInstance(Throwable.class)) {
                    Class<? extends Throwable> type = (Class<? extends Throwable>) item;
                    try {
                        Throwable exception = type.getConstructor(String.class).newInstance(EXCEPTION);
                        Mono.just(exception).transform(ThrowableTranslator::translate).subscribe(translator -> {
                            assertThat(translator.getMessage(), is(EXCEPTION));
                            assertThat(translator.getHttpStatus(), is(status));
                        });
                    } catch (InstantiationException | IllegalAccessException |
                            InvocationTargetException | NoSuchMethodException cause) {
                        throw new AssertionError("This exception class has not constructor with a String", cause);
                    }
                    return true;
                }
            }
            mismatch.appendText(item.toString());
            return false;
        }
    };
}