ReplicationTasksStorage.Task: Add multi-primary unit tests

These tests examine the replication scenarios under
multi-primary setup making use of the api calls present
in ReplicationTasksStorage.Task class similarly as done in
single master setup.

These tests ensure that the replication compatability in
multi-primary setup is not broken.

Change-Id: I980e8286bf11d31c6ab89e49ef065fdde1118181

2 files changed, 200 insertions, 6 deletions

diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskMPTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskMPTest.java
new file mode 100644
index 0000000..23d6759
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskMPTest.java
@@ -0,0 +1,194 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication;
+
+import static com.googlesource.gerrit.plugins.replication.ReplicationTasksStorageTaskTest.assertIsRunning;
+import static com.googlesource.gerrit.plugins.replication.ReplicationTasksStorageTaskTest.assertIsWaiting;
+import static com.googlesource.gerrit.plugins.replication.ReplicationTasksStorageTaskTest.assertNotRunning;
+import static com.googlesource.gerrit.plugins.replication.ReplicationTasksStorageTaskTest.assertNotWaiting;
+
+import com.google.common.jimfs.Configuration;
+import com.google.common.jimfs.Jimfs;
+import java.nio.file.FileSystem;
+import java.nio.file.Path;
+import org.eclipse.jgit.transport.URIish;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class ReplicationTasksStorageTaskMPTest {
+  protected static final String PROJECT = "myProject";
+  protected static final String REF = "myRef";
+  protected static final String REMOTE = "myDest";
+  protected static final URIish URISH =
+      ReplicationTasksStorageTest.getUrish("http://example.com/" + PROJECT + ".git");
+  protected static final ReplicationTasksStorage.ReplicateRefUpdate REF_UPDATE =
+      new ReplicationTasksStorage.ReplicateRefUpdate(PROJECT, REF, URISH, REMOTE);
+
+  protected FileSystem fileSystem;
+  protected Path storageSite;
+  protected ReplicationTasksStorage nodeA;
+  protected ReplicationTasksStorage nodeB;
+  protected ReplicationTasksStorage.Task taskA;
+  protected ReplicationTasksStorage.Task taskB;
+
+  @Before
+  public void setUp() throws Exception {
+    fileSystem = Jimfs.newFileSystem(Configuration.unix());
+    storageSite = fileSystem.getPath("replication_site");
+    nodeA = new ReplicationTasksStorage(storageSite);
+    nodeB = new ReplicationTasksStorage(storageSite);
+    taskA = nodeA.new Task(REF_UPDATE);
+    taskB = nodeB.new Task(REF_UPDATE);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    fileSystem.close();
+  }
+
+  @Test
+  public void waitingTaskCanBeCompletedByOtherNode() {
+    taskA.create();
+
+    taskB.start();
+    assertIsRunning(taskA);
+
+    taskB.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void resetTaskCanBeCompletedByOtherNode() {
+    taskA.create();
+    taskA.start();
+
+    taskA.reset();
+    assertIsWaiting(taskA);
+
+    taskB.start();
+    assertIsRunning(taskA);
+    assertIsRunning(taskB);
+
+    taskB.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void retryCanBeRetriedAndCompletedByOtherNode() {
+    taskA.create();
+    taskA.start();
+    taskA.reset();
+    taskB.start();
+
+    taskB.reset();
+    assertIsWaiting(taskA);
+
+    taskB.start();
+    assertIsRunning(taskA);
+
+    taskB.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void retryCanBeRetriedOtherNodeAndCompletedByOriginalNode() {
+    taskA.create();
+    taskA.start();
+    taskA.reset();
+    taskB.start();
+    taskB.reset();
+
+    taskA.start();
+    assertIsRunning(taskA);
+
+    taskA.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void canBeResetAllAndCompletedByOtherNode() {
+    taskA.create();
+    taskA.start();
+
+    nodeB.resetAll();
+    assertIsWaiting(taskA);
+
+    taskB.create();
+    taskB.start();
+    assertIsRunning(taskA);
+
+    taskA.finish();
+    //  Bug: https://crbug.com/gerrit/12973
+    // assertIsRunning(taskB);
+
+    taskB.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void resetAllAndCompletedByOtherNodeWhenTaskAFinishesBeforeTaskB() {
+    taskA.create();
+    taskA.start();
+    nodeB.resetAll();
+
+    taskA.finish();
+    assertIsWaiting(taskA);
+
+    taskB.start();
+    assertIsRunning(taskA);
+
+    taskB.finish();
+    assertNotRunning(taskA);
+    assertNotWaiting(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+
+  @Test
+  public void resetAllAndCompletedByOtherNodeWhenTaskAFinishesAfterTaskB() {
+    taskA.create();
+    taskA.start();
+    nodeB.resetAll();
+
+    taskB.start();
+    assertIsRunning(taskA);
+
+    taskB.finish();
+    assertNotWaiting(taskA);
+    assertNotRunning(taskA);
+
+    taskA.finish();
+    assertNotWaiting(taskA);
+    assertNotRunning(taskA);
+    assertNotRunning(taskB);
+    assertNotWaiting(taskB);
+  }
+}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskTest.java
index ca69644..38c2905 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/ReplicationTasksStorageTaskTest.java
@@ -346,27 +346,27 @@ public class ReplicationTasksStorageTaskTest {
     assertIsWaiting(persistedView);
   }
 
-  private void assertIsWaiting(Task task) {
+  protected static void assertIsWaiting(Task task) {
     assertTrue(whiteBoxIsWaiting(task));
   }
 
-  private void assertNotWaiting(Task task) {
+  protected static void assertNotWaiting(Task task) {
     assertFalse(whiteBoxIsWaiting(task));
   }
 
-  private void assertIsRunning(Task task) {
+  protected static void assertIsRunning(Task task) {
     assertTrue(whiteBoxIsRunning(task));
   }
 
-  private void assertNotRunning(Task task) {
+  protected static void assertNotRunning(Task task) {
     assertFalse(whiteBoxIsRunning(task));
   }
 
-  private boolean whiteBoxIsRunning(Task task) {
+  private static boolean whiteBoxIsRunning(Task task) {
     return Files.exists(task.running);
   }
 
-  private boolean whiteBoxIsWaiting(Task task) {
+  private static boolean whiteBoxIsWaiting(Task task) {
     return Files.exists(task.waiting);
   }