[英]Hamcrest Matchers contains with List of matchers
I am trying to use org.hamcrest.Matchers.contains(java.util.List<Matcher<? super E>>) , but the compiler tells me that it cannot resolve the method. 我正在尝试使用org.hamcrest.Matchers.contains(java.util.List <Matcher <?super E >>) ,但编译器告诉我它无法解析该方法。
I even tried the example given by Hamcrest here , but I get the same compilation error: 我甚至试图通过Hamcrest给出的例子在这里 ,但我得到相同的编译错误:
assertThat(Arrays.asList("foo", "bar"), contains(Arrays.asList(equalTo("foo"), equalTo("bar"))));
Error:(13, 9) java: no suitable method found for assertThat(java.util.List<java.lang.String>,org.hamcrest.Matcher<java.lang.Iterable<? extends java.util.List<org.hamcrest.Matcher<java.lang.String>>>>)
method org.hamcrest.MatcherAssert.<T>assertThat(T,org.hamcrest.Matcher<? super T>) is not applicable
(actual argument org.hamcrest.Matcher<java.lang.Iterable<? extends java.util.List<org.hamcrest.Matcher<java.lang.String>>>> cannot be converted to org.hamcrest.Matcher<? super java.util.List<java.lang.String>> by method invocation conversion)
method org.hamcrest.MatcherAssert.<T>assertThat(java.lang.String,T,org.hamcrest.Matcher<? super T>) is not applicable
(cannot instantiate from arguments because actual and formal argument lists differ in length)
method org.hamcrest.MatcherAssert.assertThat(java.lang.String,boolean) is not applicable
(actual argument java.util.List<java.lang.String> cannot be converted to java.lang.String by method invocation conversion)
I tried to cast the second argument to Matcher<? 我试图将第二个参数投射到Matcher <? super List<String>>
超级列表<String >>
assertThat(Arrays.asList("foo", "bar"), (Matcher<? super List<String>>)contains(Arrays.asList(equalTo("foo"), equalTo("bar"))));
but then I get another compilation error: 但后来又出现了另一个编译错误:
Error:(16, 88) java: inconvertible types
required: org.hamcrest.Matcher<? super java.util.List<java.lang.String>>
found: org.hamcrest.Matcher<java.lang.Iterable<? extends java.util.List<org.hamcrest.Matcher<java.lang.String>>>>
Is there a way to properly use this method? 有没有办法正确使用这种方法?
The problem is that Arrays.asList(equalTo("foo"), equalTo("bar"));
问题是
Arrays.asList(equalTo("foo"), equalTo("bar"));
will give you the type List<Matcher<String>>
, but you really want List<Matcher<? super String>>
会给你
List<Matcher<String>>
,但你真的想要List<Matcher<? super String>>
List<Matcher<? super String>>
. List<Matcher<? super String>>
。 You have to explicitly specify the type: 您必须明确指定类型:
assertThat(str,
contains(Arrays.<Matcher<? super String>>asList(
equalTo("foo"),
equalTo("bar"))));
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