Add the test for delete first item

core-java-modules/core-java-collections-list/src/test/java/com/ossez/list/RemoveFirstElementTest.java

@@ -0,0 +1,63 @@
+package com.ossez.list;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+/**
+ * List Remove Tes
+ *
+ * @author YuCheng Hu
+ */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+public class RemoveFirstElementTest {
+    private ArrayList<String> list = new ArrayList();
+    private LinkedList<String> linkedList = new LinkedList<>();
+
+
+    @BeforeAll
+    public void startup() {
+        list.add("cat");
+        list.add("dog");
+        list.add("pig");
+        list.add("cow");
+        list.add("goat");
+
+        linkedList.add("cat");
+        linkedList.add("dog");
+        linkedList.add("pig");
+        linkedList.add("cow");
+        linkedList.add("goat");
+    }
+
+    /**
+     * ArrayList remove first
+     */
+    @Test
+    public void testGivenList_whenRemoveFirst_thenRemoved() {
+        list.remove(0);
+
+        assertThat(list, hasSize(4));
+        assertThat(list, not(contains("cat")));
+    }
+
+    /**
+     * LinkedList remove first
+     */
+    @Test
+    public void testGivenLinkedList_whenRemoveFirst_thenRemoved() {
+
+        linkedList.removeFirst();
+
+
+        assertThat(linkedList, hasSize(4));
+        assertThat(linkedList, not(contains("cat")));
+    }
+
+}