如何将Hamcrest匹配器应用于被测类的属性? [英] How to apply a Hamcrest matcher to the property of a class under test?
问题描述
有没有一种方法可以构建组合的Hamcrest匹配器来测试对象和该对象的属性? -伪代码:
Is there a way to build a combined Hamcrest matcher which tests an object and the property of this object? - pseudo code:
both(
instanceof(MultipleFailureException.class)
).and(
// pseudo code starts
adapt(
new Adapter<MultipleFailureException, Iterable<Throwable>()
{
public Iterable<Throwable> getAdapter(MultipleFailureException item)
{
return item.getFailures();
}
},
// pseudo code ends
everyItem(instanceOf(IllegalArgumentException.class))
)
)
背景:我有一个JUnit测试,该测试遍历一组动态对象.每个对象在处理时都将引发异常.收集异常.预期测试将以MultipleFailureException结束,其中包含这些抛出的异常的集合:
Background: I have a JUnit test, which iterates over a collection of dynamic objects. Each object is expected to throw an exception when processed. The exceptions are collected. The test is expected to end with a MultipleFailureException containing a collection of these thrown exceptions:
protected final ExpectedException expectation = ExpectedException.none();
protected final ErrorCollector collector = new ErrorCollector();
@Rule
public RuleChain exceptionRules = RuleChain.outerRule(expectation).around(collector);
@Test
public void testIllegalEnumConstant()
{
expectation.expect(/* pseudo code from above */);
for (Object object : ILLEGAL_OBJECTS)
{
try
{
object.processWithThrow();
}
catch (Throwable T)
{
collector.addError(T);
}
}
}
推荐答案
我认为您可能正在寻找 hasPropertyWithValue
I think you might be looking for hasProperty or hasPropertyWithValue
Another example of something I worked with previously; here we check if we have a Quote
method getModels()
returns a collection of PhoneModel
and one of the items in the collection has a property makeId
that is equal to LG_ID and modelId
that is equal to NEXUS_4_ID.
assertThat(quote.getModels(),
hasItem(Matchers.<PhoneModel> hasProperty("makeId",
equalTo(LG_ID))));
assertThat(quote.getModels(),
hasItem(Matchers.<PhoneModel> hasProperty("modelId",
equalTo(NEXUS_4_ID))));
}
要执行此操作,hamcrest依赖您采用 JavaBean 约定.
For this to work, hamcrest relies on you adopting JavaBean conventions.
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