hamcrest 1.3 hasItems fails test when comparing identical lists - junit4

Question

The following line fails when trying to compare 2 lists:
import static org.hamcrest.CoreMatchers.*;
import static org.hamcrest.MatcherAssert.assertThat;
assertThat(
actualDealSummary.getDeals(),
hasItems(expectedDealSummary.getDeals().toArray(new Deal[expectedDealSummary.getDeals().size()])));
Using JUnit 4.11, and hamcrest-all (1.3):
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
</dependency>
I just want to check that the actual list has the expected list's values, but I get the following error:
java.lang.AssertionError:
Expected: (a collection containing &LT;SIXRxrImUE&GT; and a collection containing &LT;RQjVbVRlyG&GT; and a collection containing &LT;avnKxogdyN&GT;)
but: a collection containing &LT;SIXRxrImUE&GT; was &LT;SIXRxrImUE&GT;, was &LT;RQjVbVRlyG&GT;, was &LT;avnKxogdyN&GT;
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)
at
How can I use hamcrest's built in Matchers to compare 2 lists of pojos?

Answer 1

Your Deal class will need to implement equals for this to work. You may find it simpler to check for equality:
assertEquals(expectedDealSummary.getDeals(), actualDealSummary.getDeals());
Note that hasItems is performing a slightly different check to this and confirming that the actual list is a superset of the expected list; this would cause it to pass even if unexpected items were also present.