package com.baeldung.cactoos; import static org.junit.jupiter.api.Assertions.assertEquals; import java.io.IOException; import java.util.List; import java.util.ArrayList; import org.junit.Test; public class CactoosCollectionUtilsUnitTest { @Test public void whenFilteredClassIsCalledWithSpecificArgs_thenCorrespondingFilteredCollectionShouldBeReturned() throws IOException { CactoosCollectionUtils obj = new CactoosCollectionUtils(); // when List strings = new ArrayList() { { add("Hello"); add("John"); add("Smith"); add("Eric"); add("Dizzy"); } }; int size = obj.getFilteredList(strings).size(); // then assertEquals(3, size); } }