Extract a StandaloneSiteTest for testing offline programs

Analogous to GerritServerTest, but just initializes the site, and
provides helper methods for starting the server and running other
programs.

ReindexIT is now a one-liner.

Change-Id: Idb8e5b66bb1ae7f6e7b8e039c44396dc4898c0f3
diff --git a/gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/StandaloneSiteTest.java b/gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/StandaloneSiteTest.java
new file mode 100644
index 0000000..be34ba6
--- /dev/null
+++ b/gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/StandaloneSiteTest.java
@@ -0,0 +1,142 @@
+// Copyright (C) 2017 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.google.gerrit.acceptance;
+
+import static com.google.common.truth.Truth.assertThat;
+import static java.util.stream.Collectors.joining;
+import static org.junit.Assert.fail;
+
+import com.google.common.collect.Streams;
+import com.google.gerrit.launcher.GerritLauncher;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.util.ManualRequestContext;
+import com.google.gerrit.server.util.OneOffRequestContext;
+import com.google.gerrit.server.util.RequestContext;
+import com.google.gerrit.testutil.ConfigSuite;
+import com.google.inject.Injector;
+import com.google.inject.Provider;
+import java.util.Arrays;
+import org.eclipse.jgit.lib.Config;
+import org.junit.Rule;
+import org.junit.rules.RuleChain;
+import org.junit.rules.TemporaryFolder;
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runner.RunWith;
+import org.junit.runners.model.Statement;
+
+@RunWith(ConfigSuite.class)
+@UseLocalDisk
+public abstract class StandaloneSiteTest {
+  protected class ServerContext implements RequestContext, AutoCloseable {
+    private final GerritServer server;
+    private final ManualRequestContext ctx;
+
+    private ServerContext(GerritServer server) throws Exception {
+      this.server = server;
+      Injector i = server.getTestInjector();
+      if (adminId == null) {
+        adminId = i.getInstance(AccountCreator.class).admin().getId();
+      }
+      ctx = i.getInstance(OneOffRequestContext.class).openAs(adminId);
+    }
+
+    @Override
+    public CurrentUser getUser() {
+      return ctx.getUser();
+    }
+
+    @Override
+    public Provider<ReviewDb> getReviewDbProvider() {
+      return ctx.getReviewDbProvider();
+    }
+
+    public Injector getInjector() {
+      return server.getTestInjector();
+    }
+
+    @Override
+    public void close() throws Exception {
+      try {
+        ctx.close();
+      } finally {
+        server.close();
+      }
+    }
+  }
+
+  @ConfigSuite.Parameter public Config baseConfig;
+  @ConfigSuite.Name private String configName;
+
+  private final TemporaryFolder tempSiteDir = new TemporaryFolder();
+
+  private final TestRule testRunner =
+      new TestRule() {
+        @Override
+        public Statement apply(Statement base, Description description) {
+          return new Statement() {
+            @Override
+            public void evaluate() throws Throwable {
+              beforeTest(description);
+              base.evaluate();
+            }
+          };
+        }
+      };
+
+  @Rule public RuleChain ruleChain = RuleChain.outerRule(tempSiteDir).around(testRunner);
+
+  protected SitePaths sitePaths;
+
+  private GerritServer.Description serverDesc;
+  private Account.Id adminId;
+
+  private void beforeTest(Description description) throws Exception {
+    serverDesc = GerritServer.Description.forTestMethod(description, configName);
+    sitePaths = new SitePaths(tempSiteDir.getRoot().toPath());
+    GerritServer.init(serverDesc, baseConfig, sitePaths.site_path);
+  }
+
+  protected ServerContext startServer() throws Exception {
+    return new ServerContext(startImpl());
+  }
+
+  protected void assertServerStartupFails() throws Exception {
+    try (GerritServer server = startImpl()) {
+      fail("expected server startup to fail");
+    } catch (GerritServer.StartupException e) {
+      // Expected.
+    }
+  }
+
+  private GerritServer startImpl() throws Exception {
+    return GerritServer.start(serverDesc, baseConfig, sitePaths.site_path);
+  }
+
+  protected static void runGerrit(String... args) throws Exception {
+    assertThat(GerritLauncher.mainImpl(args))
+        .named("gerrit.war " + Arrays.stream(args).collect(joining(" ")))
+        .isEqualTo(0);
+  }
+
+  @SafeVarargs
+  protected static void runGerrit(Iterable<String>... multiArgs) throws Exception {
+    runGerrit(
+        Arrays.stream(multiArgs).flatMap(args -> Streams.stream(args)).toArray(String[]::new));
+  }
+}
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/OfflineNoteDbMigrationIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/OfflineNoteDbMigrationIT.java
index 51f3fa5..9b36b03 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/OfflineNoteDbMigrationIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/OfflineNoteDbMigrationIT.java
@@ -16,23 +16,17 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth8.assertThat;
-import static org.junit.Assert.fail;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
-import com.google.gerrit.acceptance.AccountCreator;
-import com.google.gerrit.acceptance.GerritServer;
 import com.google.gerrit.acceptance.NoHttpd;
-import com.google.gerrit.acceptance.TestAccount;
-import com.google.gerrit.acceptance.UseLocalDisk;
+import com.google.gerrit.acceptance.StandaloneSiteTest;
 import com.google.gerrit.extensions.api.GerritApi;
 import com.google.gerrit.extensions.common.ChangeInput;
-import com.google.gerrit.launcher.GerritLauncher;
-import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.client.RefNames;
 import com.google.gerrit.reviewdb.server.ReviewDb;
-import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.index.GerritIndexStatus;
 import com.google.gerrit.server.index.change.ChangeSchemaDefinitions;
@@ -42,29 +36,17 @@
 import com.google.gerrit.server.notedb.NoteDbChangeState.RefState;
 import com.google.gerrit.server.notedb.NotesMigrationState;
 import com.google.gerrit.server.schema.ReviewDbFactory;
-import com.google.gerrit.server.util.ManualRequestContext;
-import com.google.gerrit.server.util.OneOffRequestContext;
-import com.google.gerrit.testutil.ConfigSuite;
-import com.google.gerrit.testutil.TempFileUtil;
 import com.google.gwtorm.server.SchemaFactory;
-import com.google.inject.Injector;
 import com.google.inject.Key;
 import com.google.inject.TypeLiteral;
-import java.nio.file.Path;
-import java.util.stream.Stream;
-import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.eclipse.jgit.util.FS;
-import org.junit.After;
 import org.junit.Before;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.TestWatcher;
-import org.junit.runner.Description;
 
 /**
  * Tests for offline {@code migrate-to-note-db} program.
@@ -73,37 +55,16 @@
  * adding tests to {@link com.google.gerrit.acceptance.server.notedb.OnlineNoteDbMigrationIT} if
  * possible.
  */
-@UseLocalDisk
 @NoHttpd
-public class OfflineNoteDbMigrationIT {
-  @Rule
-  public TestWatcher testWatcher =
-      new TestWatcher() {
-        @Override
-        protected void starting(Description description) {
-          serverDesc = GerritServer.Description.forTestMethod(description, ConfigSuite.DEFAULT);
-        }
-      };
-
-  private GerritServer.Description serverDesc;
-
-  private Path site;
+public class OfflineNoteDbMigrationIT extends StandaloneSiteTest {
   private StoredConfig gerritConfig;
 
-  private Account.Id accountId;
   private Project.NameKey project;
   private Change.Id changeId;
 
   @Before
   public void setUp() throws Exception {
-    site = TempFileUtil.createTempDirectory().toPath();
-    GerritServer.init(serverDesc, new Config(), site);
-    gerritConfig = new FileBasedConfig(new SitePaths(site).gerrit_config.toFile(), FS.detect());
-  }
-
-  @After
-  public void tearDown() throws Exception {
-    TempFileUtil.cleanup();
+    gerritConfig = new FileBasedConfig(sitePaths.gerrit_config.toFile(), FS.detect());
   }
 
   @Test
@@ -114,10 +75,8 @@
     migrate();
     assertNotesMigrationState(NotesMigrationState.READ_WRITE_NO_SEQUENCE);
 
-    try (GerritServer server = startServer();
-        ManualRequestContext ctx = openContext(server, accountId)) {
-      GitRepositoryManager repoManager =
-          server.getTestInjector().getInstance(GitRepositoryManager.class);
+    try (ServerContext ctx = startServer()) {
+      GitRepositoryManager repoManager = ctx.getInjector().getInstance(GitRepositoryManager.class);
       ObjectId metaId;
       try (Repository repo = repoManager.openRepository(project)) {
         Ref ref = repo.exactRef(RefNames.changeMetaRef(changeId));
@@ -125,7 +84,7 @@
         metaId = ref.getObjectId();
       }
 
-      try (ReviewDb db = openUnderlyingReviewDb(server)) {
+      try (ReviewDb db = openUnderlyingReviewDb(ctx)) {
         Change c = db.changes().get(changeId);
         assertThat(c).isNotNull();
         NoteDbChangeState state = NoteDbChangeState.parse(c);
@@ -144,15 +103,13 @@
     migrate("--trial", "false");
     assertNotesMigrationState(NotesMigrationState.NOTE_DB_UNFUSED);
 
-    try (GerritServer server = startServer();
-        ManualRequestContext ctx = openContext(server, accountId)) {
-      GitRepositoryManager repoManager =
-          server.getTestInjector().getInstance(GitRepositoryManager.class);
+    try (ServerContext ctx = startServer()) {
+      GitRepositoryManager repoManager = ctx.getInjector().getInstance(GitRepositoryManager.class);
       try (Repository repo = repoManager.openRepository(project)) {
         assertThat(repo.exactRef(RefNames.changeMetaRef(changeId))).isNotNull();
       }
 
-      try (ReviewDb db = openUnderlyingReviewDb(server)) {
+      try (ReviewDb db = openUnderlyingReviewDb(ctx)) {
         Change c = db.changes().get(changeId);
         assertThat(c).isNotNull();
         NoteDbChangeState state = NoteDbChangeState.parse(c);
@@ -162,7 +119,7 @@
 
         ChangeInput in = new ChangeInput(project.get(), "master", "NoteDb-only change");
         in.newBranch = true;
-        GerritApi gApi = server.getTestInjector().getInstance(GerritApi.class);
+        GerritApi gApi = ctx.getInjector().getInstance(GerritApi.class);
         Change.Id id2 = new Change.Id(gApi.changes().create(in).info()._number);
         assertThat(db.changes().get(id2)).isNull();
       }
@@ -175,7 +132,7 @@
     setUpOneChange();
 
     int version = ChangeSchemaDefinitions.INSTANCE.getLatest().getVersion();
-    GerritIndexStatus status = new GerritIndexStatus(new SitePaths(site));
+    GerritIndexStatus status = new GerritIndexStatus(sitePaths);
     assertThat(status.getReady(ChangeSchemaDefinitions.NAME, version)).isTrue();
     status.setReady(ChangeSchemaDefinitions.NAME, version, false);
     status.save();
@@ -183,23 +140,17 @@
     migrate("--trial", "false");
     assertNotesMigrationState(NotesMigrationState.NOTE_DB_UNFUSED);
 
-    status = new GerritIndexStatus(new SitePaths(site));
+    status = new GerritIndexStatus(sitePaths);
     assertThat(status.getReady(ChangeSchemaDefinitions.NAME, version)).isFalse();
 
     // TODO(dborowitz): Remove when offline migration includes reindex.
-    try (GerritServer server = startServer()) {
-      fail("expected server startup to fail");
-    } catch (GerritServer.StartupException e) {
-      // Expected.
-    }
+    assertServerStartupFails();
   }
 
   private void setUpOneChange() throws Exception {
     project = new Project.NameKey("project");
-    try (GerritServer server = startServer();
-        ManualRequestContext ctx = openContext(server)) {
-      accountId = ctx.getUser().getAccountId();
-      GerritApi gApi = server.getTestInjector().getInstance(GerritApi.class);
+    try (ServerContext ctx = startServer()) {
+      GerritApi gApi = ctx.getInjector().getInstance(GerritApi.class);
       gApi.projects().create("project");
 
       ChangeInput in = new ChangeInput(project.get(), "master", "Test change");
@@ -208,28 +159,11 @@
     }
   }
 
-  private GerritServer startServer() throws Exception {
-    return GerritServer.start(serverDesc, new Config(), site);
-  }
-
-  private ManualRequestContext openContext(GerritServer server) throws Exception {
-    Injector i = server.getTestInjector();
-    TestAccount a = i.getInstance(AccountCreator.class).admin();
-    return openContext(server, a.getId());
-  }
-
-  private ManualRequestContext openContext(GerritServer server, Account.Id accountId)
-      throws Exception {
-    return server.getTestInjector().getInstance(OneOffRequestContext.class).openAs(accountId);
-  }
-
   private void migrate(String... additionalArgs) throws Exception {
-    String[] args =
-        Stream.concat(
-                Stream.of("migrate-to-note-db", "-d", site.toString(), "--show-stack-trace"),
-                Stream.of(additionalArgs))
-            .toArray(String[]::new);
-    assertThat(GerritLauncher.mainImpl(args)).isEqualTo(0);
+    runGerrit(
+        ImmutableList.of(
+            "migrate-to-note-db", "-d", sitePaths.site_path.toString(), "--show-stack-trace"),
+        ImmutableList.copyOf(additionalArgs));
   }
 
   private void assertNotesMigrationState(NotesMigrationState expected) throws Exception {
@@ -238,9 +172,8 @@
         .hasValue(expected);
   }
 
-  private ReviewDb openUnderlyingReviewDb(GerritServer server) throws Exception {
-    return server
-        .getTestInjector()
+  private ReviewDb openUnderlyingReviewDb(ServerContext ctx) throws Exception {
+    return ctx.getInjector()
         .getInstance(Key.get(new TypeLiteral<SchemaFactory<ReviewDb>>() {}, ReviewDbFactory.class))
         .open();
   }
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ReindexIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ReindexIT.java
index 79bbba2..10c51df 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ReindexIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ReindexIT.java
@@ -14,48 +14,14 @@
 
 package com.google.gerrit.acceptance.pgm;
 
-import static com.google.common.truth.Truth.assertThat;
-
-import com.google.gerrit.launcher.GerritLauncher;
-import com.google.gerrit.testutil.TempFileUtil;
-import java.io.File;
-import org.junit.After;
-import org.junit.Before;
+import com.google.gerrit.acceptance.NoHttpd;
+import com.google.gerrit.acceptance.StandaloneSiteTest;
 import org.junit.Test;
 
-public class ReindexIT {
-  private File sitePath;
-
-  @Before
-  public void createTempDirectory() throws Exception {
-    sitePath = TempFileUtil.createTempDirectory();
-  }
-
-  @After
-  public void destroySite() throws Exception {
-    if (sitePath != null) {
-      TempFileUtil.cleanup();
-    }
-  }
-
+@NoHttpd
+public class ReindexIT extends StandaloneSiteTest {
   @Test
   public void reindexEmptySite() throws Exception {
-    initSite();
-    runGerrit("reindex", "-d", sitePath.toString(), "--show-stack-trace");
-  }
-
-  private void initSite() throws Exception {
-    runGerrit(
-        "init",
-        "-d",
-        sitePath.getPath(),
-        "--batch",
-        "--no-auto-start",
-        "--skip-plugins",
-        "--show-stack-trace");
-  }
-
-  private static void runGerrit(String... args) throws Exception {
-    assertThat(GerritLauncher.mainImpl(args)).isEqualTo(0);
+    runGerrit("reindex", "-d", sitePaths.site_path.toString(), "--show-stack-trace");
   }
 }