Add test for miscellanious update from f-droid.org metadata

During development of a new feature, I noticed a bug occuring only after using
the new feature for several days. This was because the metadata only infrequently
changes in ways which cause certain code paths to be hit. By having the f-droid.org
metadata from several days apart in the test suite, it allows for testing more
of these cases. In the future, even later versions of the metadata can be added
to ensure that we can update happily from old to new metadata.

app/src/test/java/org/fdroid/fdroid/updater/FDroidRepoUpdateTest.java

@@ -0,0 +1,45 @@
+
+package org.fdroid.fdroid.updater;
+
+import org.fdroid.fdroid.BuildConfig;
+import org.fdroid.fdroid.RepoUpdater;
+import org.fdroid.fdroid.Utils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricGradleTestRunner;
+import org.robolectric.annotation.Config;
+
+/**
+ * Tests two versions of the official main F-Droid metadata, from 10 days apart. This is here
+ * because there is so much metadata to parse in the main repo, covering many different aspects
+ * of the available metadata. Some apps will be added, others updated, and it should all just work.
+ */
+// TODO: Use sdk=24 when Robolectric supports this
+@Config(constants = BuildConfig.class, sdk = 23)
+@RunWith(RobolectricGradleTestRunner.class)
+public class FDroidRepoUpdateTest extends MultiRepoUpdaterTest {
+
+    private static final String TAG = "FDroidRepoUpdateTest";
+
+    private static final String REPO_FDROID = "F-Droid";
+    private static final String REPO_FDROID_URI = "https://f-droid.org/repo";
+    private static final String REPO_FDROID_PUB_KEY = "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";
+
+    @Test
+    public void doesntCrash() throws RepoUpdater.UpdateException {
+        assertEmpty();
+        updateEarlier();
+        updateLater();
+    }
+
+    protected void updateEarlier() throws RepoUpdater.UpdateException {
+        Utils.debugLog(TAG, "Updating earlier version of F-Droid repo");
+        updateRepo(createUpdater(REPO_FDROID, REPO_FDROID_URI, context, REPO_FDROID_PUB_KEY), "index.fdroid.2016-10-30.jar");
+    }
+
+    protected void updateLater() throws RepoUpdater.UpdateException {
+        Utils.debugLog(TAG, "Updating later version of F-Droid repo");
+        updateRepo(createUpdater(REPO_FDROID, REPO_FDROID_URI, context, REPO_FDROID_PUB_KEY), "index.fdroid.2016-11-10.jar");
+    }
+
+}

app/src/test/java/org/fdroid/fdroid/updater/MultiRepoUpdaterTest.java

@@ -181,6 +181,10 @@ public abstract class MultiRepoUpdaterTest extends FDroidProviderTest {
         return new RepoUpdater(context, createRepo(name, uri, context));
     }
 
+    protected RepoUpdater createUpdater(String name, String uri, Context context, String signingCert) {
+        return new RepoUpdater(context, createRepo(name, uri, context, signingCert));
+    }
+
     protected void updateConflicting() throws UpdateException {
         updateRepo(createUpdater(REPO_CONFLICTING, REPO_CONFLICTING_URI, context), "multiRepo.conflicting.jar");
     }