refactor - DBWriter.addQueueItem() : refactor enqueue position calculation

to be a unit-testable component (static inner class)

2 files changed, 66 insertions, 1 deletions

diff --git a/core/src/test/java/de/danoeh/antennapod/core/feed/FeedMother.java b/core/src/test/java/de/danoeh/antennapod/core/feed/FeedMother.java
index f46797d28..991495a3f 100644
--- a/core/src/test/java/de/danoeh/antennapod/core/feed/FeedMother.java
+++ b/core/src/test/java/de/danoeh/antennapod/core/feed/FeedMother.java
@@ -1,6 +1,6 @@
 package de.danoeh.antennapod.core.feed;
 
-class FeedMother {
+public class FeedMother {
     public static final String IMAGE_URL = "http://example.com/image";
 
     public static Feed anyFeed() {
diff --git a/core/src/test/java/de/danoeh/antennapod/core/storage/DBWriterTest.java b/core/src/test/java/de/danoeh/antennapod/core/storage/DBWriterTest.java
new file mode 100644
index 000000000..0d494534c
--- /dev/null
+++ b/core/src/test/java/de/danoeh/antennapod/core/storage/DBWriterTest.java
@@ -0,0 +1,65 @@
+package de.danoeh.antennapod.core.storage;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Date;
+import java.util.List;
+
+import de.danoeh.antennapod.core.feed.FeedItem;
+import de.danoeh.antennapod.core.feed.FeedMother;
+import de.danoeh.antennapod.core.storage.DBWriter.ItemEnqueuePositionCalculator;
+import de.danoeh.antennapod.core.storage.DBWriter.ItemEnqueuePositionCalculator.Options;
+
+import static org.junit.Assert.assertEquals;
+
+public class DBWriterTest {
+
+    public static class ItemEnqueuePositionCalculatorTest {
+
+        @Test
+        public void testEnqueueDefault() {
+
+            ItemEnqueuePositionCalculator calculator =
+                    new ItemEnqueuePositionCalculator(new Options());
+
+            List<FeedItem> curQueue = tQueue();
+
+            int posActual1 = calculator.calcPosition(0, tFI(101), curQueue);
+            assertEquals("case default, i.e., add to the end", curQueue.size(), posActual1);
+
+            int posActual2 = calculator.calcPosition(1, tFI(102), curQueue);
+            assertEquals("case default (2nd item)", curQueue.size(), posActual2);
+
+        }
+
+        @Test
+        public void testEnqueueAtFront() {
+
+            ItemEnqueuePositionCalculator calculator =
+                    new ItemEnqueuePositionCalculator(new Options()
+                            .setEnqueueAtFront(true));
+
+            List<FeedItem> curQueue = tQueue();
+
+            int posActual1 = calculator.calcPosition(0, tFI(101), curQueue);
+            assertEquals("case option enqueue at front", 0, posActual1);
+
+            int posActual2 = calculator.calcPosition(1, tFI(102), curQueue);
+            assertEquals("case option enqueue at front (2nd item)", 1, posActual2);
+
+        }
+
+        private static List<FeedItem> tQueue() {
+            return Arrays.asList(tFI(11), tFI(12), tFI(13), tFI(14));
+        }
+
+        private static FeedItem tFI(int id) {
+            FeedItem item = new FeedItem(0, "Item" + id, "ItemId" + id, "url",
+                    new Date(), FeedItem.PLAYED, FeedMother.anyFeed());
+            return item;
+        }
+
+    }
+
+}
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