unit test for get feeditem link with fallback

core/src/test/java/de/danoeh/antennapod/core/util/FeedItemUtilTest.java

@@ -0,0 +1,73 @@
+package de.danoeh.antennapod.core.util;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import de.danoeh.antennapod.core.feed.Feed;
+import de.danoeh.antennapod.core.feed.FeedItem;
+
+import static org.junit.Assert.assertEquals;
+
+public class FeedItemUtilTest {
+
+
+    @RunWith(Parameterized.class)
+    public static class LinkWithFallbackTest {
+        private static final String FEED_LINK = "http://example.com";
+        private static final String ITEM_LINK = "http://example.com/feedItem1";
+
+        @Parameters
+        public static Collection<Object[]> data() {
+            return Arrays.asList(new Object[][] {
+                    { "average",
+                            FEED_LINK, ITEM_LINK, ITEM_LINK },
+                    { "null item link - fallback to feed",
+                            FEED_LINK, null, FEED_LINK},
+                    { "empty item link - same as null",
+                            FEED_LINK, "", FEED_LINK},
+                    { "blank item link - same as null",
+                            FEED_LINK, "  ", FEED_LINK},
+                    { "fallback, but feed link is null too",
+                            null, null, null },
+                    { "fallback - but empty feed link - same as null",
+                            "", null, null},
+                    { "fallback - but blank feed link - same as null",
+                            "  ", null, null}
+            });
+        }
+
+        private final String msg;
+        private final String feedLink;
+        private final String itemLink;
+        private final String expected;
+
+        public LinkWithFallbackTest(String msg, String feedLink, String itemLink, String expected) {
+            this.msg = msg;
+            this.feedLink = feedLink;
+            this.itemLink = itemLink;
+            this.expected = expected;
+        }
+
+
+        @Test
+        public void testLinkWithFallback() {
+            String actual = FeedItemUtil.getLinkWithFallback(createFeedItem(feedLink, itemLink));
+            assertEquals(msg, expected, actual);
+        }
+
+        private static FeedItem createFeedItem(String feedLink, String itemLink) {
+            Feed feed = new Feed();
+            feed.setLink(feedLink);
+            FeedItem feedItem = new FeedItem();
+            feedItem.setLink(itemLink);
+            feedItem.setFeed(feed);
+            feed.setItems(Arrays.asList(feedItem));
+            return feedItem;
+        }
+    }
+}