package com.baeldung.eclipsecollections; import org.eclipse.collections.api.list.MutableList; import org.eclipse.collections.impl.list.mutable.FastList; import org.assertj.core.api.Assertions; import org.junit.Test; public class CollectPatternTest { @Test public void whenCollect_thenCorrect() { Student student1 = new Student("John", "Hopkins"); Student student2 = new Student("George", "Adams"); MutableList students = FastList.newListWith(student1, student2); MutableList lastNames = students.collect(Student::getLastName); Assertions.assertThat(lastNames) .containsExactly("Hopkins", "Adams"); } }