Add unit tests for FilesystemDeleteHandler

Change-Id: I6016003bc8938e6389e17cb96bd5a439f803b4c0

src/test/java/com/googlesource/gerrit/plugins/deleteproject/fs/FilesystemDeleteHandlerTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/deleteproject/fs/FilesystemDeleteHandlerTest.java b/src/test/java/com/googlesource/gerrit/plugins/deleteproject/fs/FilesystemDeleteHandlerTest.java
new file mode 100644
index 0000000..21880c5
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/deleteproject/fs/FilesystemDeleteHandlerTest.java
@@ -0,0 +1,115 @@
+// Copyright (C) 2018 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.deleteproject.fs;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
+
+import com.google.gerrit.extensions.events.ProjectDeletedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.eclipse.jgit.internal.storage.file.FileRepository;
+import org.eclipse.jgit.lib.Repository;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class FilesystemDeleteHandlerTest {
+
+  @Mock private GitRepositoryManager repoManager;
+  @Mock private ProjectDeletedListener projectDeleteListener;
+
+  @Rule public TemporaryFolder tempFolder = new TemporaryFolder();
+
+  private DynamicSet<ProjectDeletedListener> deletedListener;
+  private FilesystemDeleteHandler fsDeleteHandler;
+  private Path basePath;
+
+  @Before
+  public void setUp() throws Exception {
+    basePath = tempFolder.newFolder().toPath().resolve("base");
+    deletedListener = new DynamicSet<>();
+    deletedListener.add(projectDeleteListener);
+  }
+
+  @Test
+  public void shouldDeleteRepository() throws Exception {
+    String repoName = "testRepo";
+    Repository repository = createRepository(repoName);
+    Project.NameKey nameKey = new Project.NameKey(repoName);
+    Project project = new Project(nameKey);
+    when(repoManager.openRepository(nameKey)).thenReturn(repository);
+    fsDeleteHandler = new FilesystemDeleteHandler(repoManager, deletedListener);
+    fsDeleteHandler.delete(project, false);
+    assertThat(repository.getDirectory().exists()).isFalse();
+  }
+
+  @Test
+  public void shouldDeleteEmptyParentFolders() throws Exception {
+    String repoName = "a/b/c";
+    Repository repository = createRepository(repoName);
+    Project.NameKey nameKey = new Project.NameKey(repoName);
+    Project project = new Project(nameKey);
+    when(repoManager.openRepository(nameKey)).thenReturn(repository);
+    fsDeleteHandler = new FilesystemDeleteHandler(repoManager, deletedListener);
+    fsDeleteHandler.delete(project, false);
+    assertThat(repository.getDirectory().exists()).isFalse();
+  }
+
+  @Test
+  public void shouldKeepCommonFolders() throws Exception {
+    String repoToDeleteName = "a/b/c/d";
+    Repository repoToDelete = createRepository(repoToDeleteName);
+
+    String repoToKeepName = "a/b/e";
+    Repository repoToKeep = createRepository(repoToKeepName);
+
+    Project.NameKey nameKey = new Project.NameKey(repoToDeleteName);
+    Project project = new Project(nameKey);
+    when(repoManager.openRepository(nameKey)).thenReturn(repoToDelete);
+    fsDeleteHandler = new FilesystemDeleteHandler(repoManager, deletedListener);
+    fsDeleteHandler.delete(project, false);
+    assertThat(repoToDelete.getDirectory().exists()).isFalse();
+    assertThat(repoToKeep.getDirectory().exists()).isTrue();
+  }
+
+  @Test
+  public void shouldPreserveRepository() throws Exception {
+    String repoName = "preservedRepo";
+    Repository repository = createRepository(repoName);
+    Project.NameKey nameKey = new Project.NameKey(repoName);
+    Project project = new Project(nameKey);
+    when(repoManager.openRepository(nameKey)).thenReturn(repository);
+    fsDeleteHandler = new FilesystemDeleteHandler(repoManager, deletedListener);
+    fsDeleteHandler.delete(project, true);
+    assertThat(repository.getDirectory().exists()).isTrue();
+  }
+
+  private FileRepository createRepository(String repoName) throws IOException {
+    Path repoPath = Files.createDirectories(basePath.resolve(repoName));
+    Repository repository = new FileRepository(repoPath.toFile());
+    repository.create(true);
+    return (FileRepository) repository;
+  }
+}