diff --git a/core-java-collections/src/test/java/com/baeldung/collection/CollectionsEmpty.java b/core-java-collections/src/test/java/com/baeldung/collection/CollectionsEmpty.java new file mode 100644 index 0000000000..86a262107d --- /dev/null +++ b/core-java-collections/src/test/java/com/baeldung/collection/CollectionsEmpty.java @@ -0,0 +1,26 @@ +package com.baeldung.collection; + +import java.util.List; +import java.util.ArrayList; +import java.util.Collections; +import org.junit.Assert; +import org.junit.Test; + +public class CollectionsEmpty { + + @Test + public void givenArrayList_whenAddingElement_addsNewElement() { + ArrayList mutableList = new ArrayList<>(); + mutableList.add("test"); + + Assert.assertEquals(mutableList.size(), 1); + Assert.assertEquals(mutableList.get(0), "test"); + } + + @Test(expected = UnsupportedOperationException.class) + public void givenCollectionsEmptyList_whenAddingElement_throwsUnsupportedOperationException() { + List immutableList = Collections.emptyList(); + immutableList.add("test"); + } + +} \ No newline at end of file