hamcrest hasItem and hasProperty, assert if a object with property value exists

Question

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasItem;
import static org.hamcrest.Matchers.equalTo;

assertThat(actual, hasItem(hasProperty("id", equalTo(1L))));

where actual is a POJO with id as Long.

I get,

The method assertThat(T, Matcher<? super T>) in the type MatcherAssert is not applicable for the arguments (List, Matcher<Iterable<? super Object>>)

From various documentation and other stackoverflow pages, it should be valid, but I get the above error.

Ventris

Please see "How to Ask" and the linked pages and "minimal reproducible example". What is the minimal code that demonstrates the problem you encountered, along with the explanation of the problem, and the minimal input data and the expected result? We need to be able to duplicate the problem, and this example code won't do that. – Push

Answer 1

Try explicitly filling in the type parameter - assuming actual is a List<YourPojo>, try calling:

assertThat(actual, hasItem(Matchers.<YourPojo>hasProperty("id", equalTo(1L))));

Countermeasure

thanks, that works. We had a similar issue when using containsInAnyOrder but couldn't get it to work. – Ventris

Answer 2

The shorter version when you do not have to specify class type:

List<IssueDefinitionDto> definitions = ...; // Tested variable
...
assertThat(definitions, hasItem(hasProperty("id", is(10L))));

Pinky