dependencies { implementation 'com.google.guava:guava:30.1-jre' implementation 'org.easytesting:fest-util:1.2.5' } import static org.assertj.core.api.Assertions.assertThat; import com.google.common.collect.ImmutableList; public class MyGuavaClassTest { @Test public void testImmutableList() { ImmutableList<String> list = ImmutableList.of("foo", "bar"); assertThat(list).isNotEmpty() .contains("foo") .doesNotContain("baz"); } }