Expand test for Reindex program

Change-Id: I4caa8047e80150bfc76c76a6b5ed2a96f9176692

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/pgm/ReindexIT.java

@@ -14,14 +14,45 @@
 
 package com.google.gerrit.acceptance.pgm;
 
+import static com.google.common.truth.Truth8.assertThat;
+
+import com.google.common.io.MoreFiles;
 import com.google.gerrit.acceptance.NoHttpd;
 import com.google.gerrit.acceptance.StandaloneSiteTest;
+import com.google.gerrit.extensions.api.GerritApi;
+import com.google.gerrit.extensions.common.ChangeInput;
+import com.google.gerrit.reviewdb.client.Project;
+import java.nio.file.Files;
 import org.junit.Test;
 
 @NoHttpd
 public class ReindexIT extends StandaloneSiteTest {
   @Test
-  public void reindexEmptySite() throws Exception {
+  public void reindexFromScratch() throws Exception {
+    Project.NameKey project = new Project.NameKey("project");
+    String changeId;
+    try (ServerContext ctx = startServer()) {
+      GerritApi gApi = ctx.getInjector().getInstance(GerritApi.class);
+      gApi.projects().create("project");
+
+      ChangeInput in = new ChangeInput();
+      in.project = project.get();
+      in.branch = "master";
+      in.subject = "Test change";
+      in.newBranch = true;
+      changeId = gApi.changes().create(in).info().changeId;
+    }
+
+    MoreFiles.deleteRecursively(sitePaths.index_dir);
+    Files.createDirectory(sitePaths.index_dir);
+    assertServerStartupFails();
+
     runGerrit("reindex", "-d", sitePaths.site_path.toString(), "--show-stack-trace");
+
+    try (ServerContext ctx = startServer()) {
+      GerritApi gApi = ctx.getInjector().getInstance(GerritApi.class);
+      assertThat(gApi.changes().query("message:Test").get().stream().map(c -> c.changeId))
+          .containsExactly(changeId);
+    }
   }
 }