How do you test code that uses HashSet?

Testing code that uses HashSet can be done in a few different ways to ensure that your implementation is working as expected. Below is an example showing how to test a Java HashSet for basic operations such as adding, removing, and checking elements.

import org.junit.jupiter.api.Test; import java.util.HashSet; import static org.junit.jupiter.api.Assertions.*; public class HashSetTest { @Test public void testHashSet() { HashSet set = new HashSet<>(); // Adding elements set.add("Apple"); set.add("Banana"); assertTrue(set.contains("Apple")); assertTrue(set.contains("Banana")); // Removing an element set.remove("Apple"); assertFalse(set.contains("Apple")); } }

HashSet Java JUnit Testing Collections

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