Test PlayQueue equals

app/src/test/java/org/schabi/newpipe/player/playqueue/PlayQueueTest.java

@@ -0,0 +1,78 @@
+package org.schabi.newpipe.player.playqueue;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.experimental.runners.Enclosed;
+import org.junit.runner.RunWith;
+import org.schabi.newpipe.extractor.stream.StreamInfoItem;
+import org.schabi.newpipe.extractor.stream.StreamType;
+
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+@SuppressWarnings("checkstyle:HideUtilityClassConstructor")
+@RunWith(Enclosed.class)
+public class PlayQueueTest {
+    public static PlayQueue mockPlayQueue(final int index, final List<PlayQueueItem> streams) {
+        // I tried using Mockito, but it didn't work for some reason
+        return new PlayQueue(index, streams) {
+            @Override
+            public boolean isComplete() {
+                throw new UnsupportedOperationException();
+            }
+
+            @Override
+            public void fetch() {
+                throw new UnsupportedOperationException();
+            }
+        };
+    }
+
+    public static class EqualsTests {
+        private PlayQueueItem item1;
+        private PlayQueueItem item2;
+
+        @Before
+        public void setup() {
+            final String url1 = "www.website1.com";
+            final String url2 = "www.website2.com";
+            final StreamInfoItem info1 = new StreamInfoItem(
+                    0, url1, "", StreamType.VIDEO_STREAM
+            );
+            final StreamInfoItem info2 = new StreamInfoItem(
+                    0, url2, "", StreamType.VIDEO_STREAM
+            );
+            item1 = new PlayQueueItem(info1);
+            item2 = new PlayQueueItem(info2);
+        }
+
+        @Test
+        public void sameStreams() {
+            final List<PlayQueueItem> streams = Collections.nCopies(5, item1);
+            final PlayQueue queue1 = mockPlayQueue(0, streams);
+            final PlayQueue queue2 = mockPlayQueue(0, streams);
+            assertEquals(queue1, queue2);
+        }
+
+        @Test
+        public void sameSizeDifferentItems() {
+            final List<PlayQueueItem> streams1 = Collections.nCopies(5, item1);
+            final List<PlayQueueItem> streams2 = Collections.nCopies(5, item2);
+            final PlayQueue queue1 = mockPlayQueue(0, streams1);
+            final PlayQueue queue2 = mockPlayQueue(0, streams2);
+            assertNotEquals(queue1, queue2);
+        }
+
+        @Test
+        public void differentSizeStreams() {
+            final List<PlayQueueItem> streams1 = Collections.nCopies(5, item1);
+            final List<PlayQueueItem> streams2 = Collections.nCopies(6, item2);
+            final PlayQueue queue1 = mockPlayQueue(0, streams1);
+            final PlayQueue queue2 = mockPlayQueue(0, streams2);
+            assertNotEquals(queue1, queue2);
+        }
+    }
+}