Is there a way to do deep comparison on a nested property with Hamcrest

java unit-testing hamcrest
Gaurav Rawat picture Gaurav Rawat · Apr 1, 2016 · Viewed 9.8k times · Source

I use hamcrest for most of my testing ,but have encountered a issue with it not being able to test a property one level down in the object graph .A snipped of my test case is below

final List<Foo> foos= fooRepository.findAll(spec);
      assertThat(results, is(notNullValue()));
      assertThat(results, hasItem(hasProperty("id.fooID1", equalTo("FOOID1"))));

so here I want to check if in the list of foos I have a property id.fooID1 equla to FOOID1 .Here I am going one level down to check my nested property .This doesnt currently work in hamcrest and I get the following error.

java.lang.AssertionError: 
Expected: a collection containing hasProperty("id.fooID1", "FOOID1")
     but: No property "id.fooID1"
    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
    at org.junit.Assert.assertThat(Assert.java:956)
    at org.junit.Assert.assertThat(Assert.java:923)

any help or workaround on this issue .

Answer

eee picture eee · Apr 2, 2016

You can nest hasProperty calls:

assertThat(results, hasItem(hasProperty("id", hasProperty("fooID1", equalTo("FOOID1")))));

For deeper nestings this might be a bit unwieldy.

Related questions

How do I assert an Iterable contains elements with a certain property?

Assume I want to unit test a method with this signature: List<MyItem> getMyItems(); Assume MyItem is a Pojo that has many properties, one of which is "name", accessed via getName(). All I care about verifying is that …

Read More
Why doesn't this code attempting to use Hamcrest's hasItems compile?

Why does this not compile, oh, what to do? import static org.junit.Assert.assertThat; import static org.junit.matchers.JUnitMatchers.hasItems; ArrayList<Integer> actual = new ArrayList<Integer>(); ArrayList<Integer> expected = new ArrayList<…

Read More
How to assertThat String is not empty

Asserting that a string is not empty in junit can be done in the following ways: assertTrue(!string.isEmpty()); assertFalse(string.isEmpty()); assertThat(string.toCharArray(), is(not(emptyArray())); // (although this didn't compile) My question is: is there a better way …

Read More