how to use assertj extracting map property

java junit assert assertj

lhoak · Jul 25, 2015 · Viewed 12.5k times · Source

I am using AssertJ. I have a class like MyObj. And I have a List of MyObj.

Class MyObj {
    ...
    Map<K,V> myMap;
    ...
}

When I use:

assertThat(list).extracting("myMap"), I cannot use .containsKey() method.
I also tried using assertThat(list).extracting("myMap", Map.class), but it does not work either.

What is the right way of using it?

Answer

AssertJ has entry() method. You can assert map value like this.

assertThat(list)
    .extracting("myMap")
    .contains(entry("foo1", "bar1"), entry("foo2", "bar2"));