// Copyright (C) 2013 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.api.change;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.acceptance.PushOneCommit.FILE_NAME;
import static com.google.gerrit.acceptance.PushOneCommit.SUBJECT;
import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
import static com.google.gerrit.server.group.SystemGroupBackend.CHANGE_OWNER;
import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static com.google.gerrit.server.project.Util.blockLabel;
import static com.google.gerrit.server.project.Util.category;
import static com.google.gerrit.server.project.Util.value;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.NoHttpd;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.acceptance.TestProjectInput;
import com.google.gerrit.common.data.LabelType;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.extensions.api.changes.AddReviewerInput;
import com.google.gerrit.extensions.api.changes.RebaseInput;
import com.google.gerrit.extensions.api.changes.ReviewInput;
import com.google.gerrit.extensions.api.changes.RevisionApi;
import com.google.gerrit.extensions.client.ChangeStatus;
import com.google.gerrit.extensions.client.ListChangesOption;
import com.google.gerrit.extensions.common.ApprovalInfo;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.common.ChangeMessageInfo;
import com.google.gerrit.extensions.common.GitPerson;
import com.google.gerrit.extensions.common.LabelInfo;
import com.google.gerrit.extensions.common.RevisionInfo;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.group.SystemGroupBackend;
import com.google.gerrit.server.project.Util;

import org.eclipse.jgit.lib.Constants;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;

@NoHttpd
public class ChangeIT extends AbstractDaemonTest {

  @Test
  public void get() throws Exception {
    PushOneCommit.Result r = createChange();
    String triplet = project.get() + "~master~" + r.getChangeId();
    ChangeInfo c = info(triplet);
    assertThat(c.id).isEqualTo(triplet);
    assertThat(c.project).isEqualTo(project.get());
    assertThat(c.branch).isEqualTo("master");
    assertThat(c.status).isEqualTo(ChangeStatus.NEW);
    assertThat(c.subject).isEqualTo("test commit");
    assertThat(c.mergeable).isTrue();
    assertThat(c.changeId).isEqualTo(r.getChangeId());
    assertThat(c.created).isEqualTo(c.updated);
    assertThat(c._number).isEqualTo(r.getChange().getId().get());

    assertThat(c.owner._accountId).isEqualTo(admin.getId().get());
    assertThat(c.owner.name).isNull();
    assertThat(c.owner.email).isNull();
    assertThat(c.owner.username).isNull();
    assertThat(c.owner.avatars).isNull();
  }

  @Test
  public void abandon() throws Exception {
    PushOneCommit.Result r = createChange();
    assertThat(info(r.getChangeId()).status).isEqualTo(ChangeStatus.NEW);
    gApi.changes()
        .id(r.getChangeId())
        .abandon();
    ChangeInfo info = get(r.getChangeId());
    assertThat(info.status).isEqualTo(ChangeStatus.ABANDONED);
    assertThat(Iterables.getLast(info.messages).message.toLowerCase())
        .contains("abandoned");
  }

  @Test
  public void restore() throws Exception {
    PushOneCommit.Result r = createChange();
    assertThat(info(r.getChangeId()).status).isEqualTo(ChangeStatus.NEW);
    gApi.changes()
        .id(r.getChangeId())
        .abandon();
    assertThat(info(r.getChangeId()).status).isEqualTo(ChangeStatus.ABANDONED);

    gApi.changes()
        .id(r.getChangeId())
        .restore();
    ChangeInfo info = get(r.getChangeId());
    assertThat(info.status).isEqualTo(ChangeStatus.NEW);
    assertThat(Iterables.getLast(info.messages).message.toLowerCase())
        .contains("restored");
  }

  @Test
  public void revert() throws Exception {
    PushOneCommit.Result r = createChange();
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .review(ReviewInput.approve());
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .submit();
    ChangeInfo revertChange =
        gApi.changes()
            .id(r.getChangeId())
            .revert().get();

    // expected messages on source change:
    // 1. Uploaded patch set 1.
    // 2. Patch Set 1: Code-Review+2
    // 3. Change has been successfully merged by Administrator
    // 4. Patch Set 1: Reverted
    List<ChangeMessageInfo> sourceMessages = new ArrayList<>(
        gApi.changes().id(r.getChangeId()).get().messages);
    assertThat(sourceMessages).hasSize(4);
    String expectedMessage = String.format(
        "Patch Set 1: Reverted\n\n" +
        "This patchset was reverted in change: %s",
        revertChange.changeId);
    assertThat(sourceMessages.get(3).message).isEqualTo(expectedMessage);

    assertThat(revertChange.messages).hasSize(1);
    assertThat(revertChange.messages.iterator().next().message)
        .isEqualTo("Uploaded patch set 1.");
  }

  @Test
  @TestProjectInput(createEmptyCommit = false)
  public void revertInitialCommit() throws Exception {
    PushOneCommit.Result r = createChange();
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .review(ReviewInput.approve());
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .submit();

    exception.expect(ResourceConflictException.class);
    exception.expectMessage("Cannot revert initial commit");
    gApi.changes()
        .id(r.getChangeId())
        .revert();
  }

  @Test
  public void rebase() throws Exception {
    // Create two changes both with the same parent
    PushOneCommit.Result r = createChange();
    testRepo.reset("HEAD~1");
    PushOneCommit.Result r2 = createChange();

    // Approve and submit the first change
    RevisionApi revision = gApi.changes()
        .id(r.getChangeId())
        .current();
    revision.review(ReviewInput.approve());
    revision.submit();

    // Rebase the second change
    gApi.changes()
        .id(r2.getChangeId())
        .current()
        .rebase();

    // Second change should have 2 patch sets
    assertThat(r2.getPatchSetId().get()).isEqualTo(2);

    // ...and the committer should be correct
    ChangeInfo info = gApi.changes()
        .id(r2.getChangeId()).get(EnumSet.of(
            ListChangesOption.CURRENT_REVISION,
            ListChangesOption.CURRENT_COMMIT));
    GitPerson committer = info.revisions.get(
        info.currentRevision).commit.committer;
    assertThat(committer.name).isEqualTo(admin.fullName);
    assertThat(committer.email).isEqualTo(admin.email);
  }

  @Test(expected = ResourceConflictException.class)
  public void rebaseUpToDateChange() throws Exception {
    PushOneCommit.Result r = createChange();
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .rebase();
  }

  @Test
  public void rebaseConflict() throws Exception {
    PushOneCommit.Result r = createChange();
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .review(ReviewInput.approve());
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .submit();

    PushOneCommit push = pushFactory.create(db, admin.getIdent(), testRepo,
        PushOneCommit.SUBJECT, PushOneCommit.FILE_NAME, "other content",
        "If09d8782c1e59dd0b33de2b1ec3595d69cc10ad5");
    r = push.to("refs/for/master");
    r.assertOkStatus();

    exception.expect(ResourceConflictException.class);
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .rebase();
  }

  @Test
  public void rebaseChangeBase() throws Exception {
    PushOneCommit.Result r1 = createChange();
    PushOneCommit.Result r2 = createChange();
    PushOneCommit.Result r3 = createChange();
    RebaseInput ri = new RebaseInput();

    // rebase r3 directly onto master (break dep. towards r2)
    ri.base = "";
    gApi.changes()
        .id(r3.getChangeId())
        .revision(r3.getCommit().name())
        .rebase(ri);
    PatchSet ps3 = r3.getPatchSet();
    assertThat(ps3.getId().get()).isEqualTo(2);

    // rebase r2 onto r3 (referenced by ref)
    ri.base = ps3.getId().toRefName();
    gApi.changes()
        .id(r2.getChangeId())
        .revision(r2.getCommit().name())
        .rebase(ri);
    PatchSet ps2 = r2.getPatchSet();
    assertThat(ps2.getId().get()).isEqualTo(2);

    // rebase r1 onto r2 (referenced by commit)
    ri.base = ps2.getRevision().get();
    gApi.changes()
        .id(r1.getChangeId())
        .revision(r1.getCommit().name())
        .rebase(ri);
    PatchSet ps1 = r1.getPatchSet();
    assertThat(ps1.getId().get()).isEqualTo(2);

    // rebase r1 onto r3 (referenced by change number)
    ri.base = String.valueOf(r3.getChange().getId().get());
    gApi.changes()
        .id(r1.getChangeId())
        .revision(ps1.getRevision().get())
        .rebase(ri);
    assertThat(r1.getPatchSetId().get()).isEqualTo(3);
  }

  @Test(expected = ResourceConflictException.class)
  public void rebaseChangeBaseRecursion() throws Exception {
    PushOneCommit.Result r1 = createChange();
    PushOneCommit.Result r2 = createChange();

    RebaseInput ri = new RebaseInput();
    ri.base = r2.getCommit().name();
    gApi.changes()
        .id(r1.getChangeId())
        .revision(r1.getCommit().name())
        .rebase(ri);
  }

  private Set<Account.Id> getReviewers(String changeId) throws Exception {
    ChangeInfo ci = gApi.changes().id(changeId).get();
    Set<Account.Id> result = Sets.newHashSet();
    for (LabelInfo li : ci.labels.values()) {
      for (ApprovalInfo ai : li.all) {
        result.add(new Account.Id(ai._accountId));
      }
    }
    return result;
  }

  @Test
  public void addReviewer() throws Exception {
    PushOneCommit.Result r = createChange();
    AddReviewerInput in = new AddReviewerInput();
    in.reviewer = user.email;
    gApi.changes()
        .id(r.getChangeId())
        .addReviewer(in);

    assertThat(getReviewers(r.getChangeId()))
        .containsExactlyElementsIn(ImmutableSet.of(user.id));
  }

  @Test
  public void addReviewerToClosedChange() throws Exception {
    PushOneCommit.Result r = createChange();
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .review(ReviewInput.approve());
    gApi.changes()
        .id(r.getChangeId())
        .revision(r.getCommit().name())
        .submit();

    assertThat(getReviewers(r.getChangeId()))
      .containsExactlyElementsIn(ImmutableSet.of(admin.getId()));

    AddReviewerInput in = new AddReviewerInput();
    in.reviewer = user.email;
    gApi.changes()
        .id(r.getChangeId())
        .addReviewer(in);
    assertThat(getReviewers(r.getChangeId()))
        .containsExactlyElementsIn(ImmutableSet.of(admin.getId(), user.id));
  }

  @Test
  public void nonVotingReviewerStaysAfterSubmit() throws Exception {
    LabelType verified = category("Verified",
        value(1, "Passes"), value(0, "No score"), value(-1, "Failed"));
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    cfg.getLabelSections().put(verified.getName(), verified);
    String heads = "refs/heads/*";
    AccountGroup.UUID owners =
        SystemGroupBackend.getGroup(CHANGE_OWNER).getUUID();
    AccountGroup.UUID registered =
        SystemGroupBackend.getGroup(REGISTERED_USERS).getUUID();
    Util.allow(cfg,
        Permission.forLabel(verified.getName()), -1, 1, owners, heads);
    Util.allow(cfg,
        Permission.forLabel("Code-Review"), -2, +2, registered, heads);
    saveProjectConfig(project, cfg);

    // Set Code-Review+2 and Verified+1 as admin (change owner)
    PushOneCommit.Result r = createChange();
    String changeId = r.getChangeId();
    String commit = r.getCommit().name();
    ReviewInput input = ReviewInput.approve();
    input.label(verified.getName(), 1);
    gApi.changes()
        .id(changeId)
        .revision(commit)
        .review(input);

    // Reviewers should only be "admin"
    assertThat(getReviewers(changeId))
        .containsExactlyElementsIn(ImmutableSet.of(admin.getId()));

    // Add the user as reviewer
    AddReviewerInput in = new AddReviewerInput();
    in.reviewer = user.email;
    gApi.changes()
        .id(changeId)
        .addReviewer(in);
    assertThat(getReviewers(changeId))
        .containsExactlyElementsIn(ImmutableSet.of(admin.getId(), user.getId()));

    // Approve the change as user, then remove the approval
    // (only to confirm that the user does have Code-Review+2 permission)
    setApiUser(user);
    gApi.changes()
        .id(changeId)
        .revision(commit)
        .review(ReviewInput.approve());
    gApi.changes()
        .id(changeId)
        .revision(commit)
        .review(ReviewInput.noScore());

    // Submit the change
    setApiUser(admin);
    gApi.changes()
        .id(changeId)
        .revision(commit)
        .submit();

    // User should still be on the change
    assertThat(getReviewers(changeId))
        .containsExactlyElementsIn(ImmutableSet.of(admin.getId(), user.getId()));
  }

  @Test
  public void createEmptyChange() throws Exception {
    ChangeInfo in = new ChangeInfo();
    in.branch = Constants.MASTER;
    in.subject = "Create a change from the API";
    in.project = project.get();
    ChangeInfo info = gApi
        .changes()
        .create(in)
        .get();
    assertThat(info.project).isEqualTo(in.project);
    assertThat(info.branch).isEqualTo(in.branch);
    assertThat(info.subject).isEqualTo(in.subject);
    assertThat(Iterables.getOnlyElement(info.messages).message)
        .isEqualTo("Uploaded patch set 1.");
  }

  @Test
  public void queryChangesNoQuery() throws Exception {
    PushOneCommit.Result r = createChange();
    List<ChangeInfo> results = gApi.changes().query().get();
    assertThat(results.size()).isAtLeast(1);
    List<Integer> ids = new ArrayList<>(results.size());
    for (int i = 0; i < results.size(); i++) {
      ChangeInfo info = results.get(i);
      if (i == 0) {
        assertThat(info._number).isEqualTo(r.getChange().getId().get());
      }
      assertThat(Change.Status.forChangeStatus(info.status).isOpen()).isTrue();
      ids.add(info._number);
    }
    assertThat(ids).contains(r.getChange().getId().get());
  }

  @Test
  public void queryChangesNoResults() throws Exception {
    createChange();
    assertThat(query("message:test")).isNotEmpty();
    assertThat(query("message:{" + getClass().getName() + "fhqwhgads}"))
        .isEmpty();
  }

  @Test
  public void queryChanges() throws Exception {
    PushOneCommit.Result r1 = createChange();
    createChange();
    List<ChangeInfo> results =
        query("project:{" + project.get() + "} " + r1.getChangeId());
    assertThat(Iterables.getOnlyElement(results).changeId)
        .isEqualTo(r1.getChangeId());
  }

  @Test
  public void queryChangesLimit() throws Exception {
    createChange();
    PushOneCommit.Result r2 = createChange();
    List<ChangeInfo> results = gApi.changes().query().withLimit(1).get();
    assertThat(results).hasSize(1);
    assertThat(Iterables.getOnlyElement(results).changeId)
        .isEqualTo(r2.getChangeId());
  }

  @Test
  public void queryChangesStart() throws Exception {
    PushOneCommit.Result r1 = createChange();
    createChange();
    List<ChangeInfo> results = gApi.changes()
        .query("project:{" + project.get() + "}").withStart(1).get();
    assertThat(Iterables.getOnlyElement(results).changeId)
        .isEqualTo(r1.getChangeId());
  }

  @Test
  public void queryChangesNoOptions() throws Exception {
    PushOneCommit.Result r = createChange();
    ChangeInfo result = Iterables.getOnlyElement(query(r.getChangeId()));
    assertThat(result.labels).isNull();
    assertThat(result.messages).isNull();
    assertThat(result.revisions).isNull();
    assertThat(result.actions).isNull();
  }

  @Test
  public void queryChangesOptions() throws Exception {
    PushOneCommit.Result r = createChange();
    ChangeInfo result = Iterables.getOnlyElement(gApi.changes()
        .query(r.getChangeId())
        .withOptions(EnumSet.allOf(ListChangesOption.class))
        .get());
    assertThat(Iterables.getOnlyElement(result.labels.keySet()))
        .isEqualTo("Code-Review");
    assertThat(result.messages).hasSize(1);
    assertThat(result.actions).isNotEmpty();

    RevisionInfo rev = Iterables.getOnlyElement(result.revisions.values());
    assertThat(rev._number).isEqualTo(r.getPatchSetId().get());
    assertThat(rev.created).isNotNull();
    assertThat(rev.uploader._accountId).isEqualTo(admin.getId().get());
    assertThat(rev.ref).isEqualTo(r.getPatchSetId().toRefName());
    assertThat(rev.actions).isNotEmpty();
  }

  @Test
  public void queryChangesOwnerWithDifferentUsers() throws Exception {
    PushOneCommit.Result r = createChange();
    assertThat(Iterables.getOnlyElement(
            query("project:{" + project.get() + "} owner:self")).changeId)
        .isEqualTo(r.getChangeId());
    setApiUser(user);
    assertThat(query("owner:self")).isEmpty();
  }

  @Test
  public void checkReviewedFlagBeforeAndAfterReview() throws Exception {
    PushOneCommit.Result r = createChange();
    AddReviewerInput in = new AddReviewerInput();
    in.reviewer = user.email;
    gApi.changes()
        .id(r.getChangeId())
        .addReviewer(in);

    setApiUser(user);
    assertThat(get(r.getChangeId()).reviewed).isNull();

    revision(r).review(ReviewInput.recommend());
    assertThat(get(r.getChangeId()).reviewed).isTrue();
  }

  @Test
  public void topic() throws Exception {
    PushOneCommit.Result r = createChange();
    assertThat(gApi.changes()
        .id(r.getChangeId())
        .topic()).isEqualTo("");
    gApi.changes()
        .id(r.getChangeId())
        .topic("mytopic");
    assertThat(gApi.changes()
        .id(r.getChangeId())
        .topic()).isEqualTo("mytopic");
    gApi.changes()
        .id(r.getChangeId())
        .topic("");
    assertThat(gApi.changes()
        .id(r.getChangeId())
        .topic()).isEqualTo("");
  }

  @Test
  public void check() throws Exception {
    PushOneCommit.Result r = createChange();
    assertThat(gApi.changes()
        .id(r.getChangeId())
        .get()
        .problems).isNull();
    assertThat(gApi.changes()
        .id(r.getChangeId())
        .get(EnumSet.of(ListChangesOption.CHECK))
        .problems).isEmpty();
  }

  @Test
  public void commitFooters() throws Exception {
    LabelType verified = category("Verified",
        value(1, "Passes"), value(0, "No score"), value(-1, "Failed"));
    LabelType custom1 = category("Custom1",
        value(1, "Positive"), value(0, "No score"), value(-1, "Negative"));
    LabelType custom2 = category("Custom2",
        value(1, "Positive"), value(0, "No score"), value(-1, "Negative"));
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    cfg.getLabelSections().put(verified.getName(), verified);
    cfg.getLabelSections().put(custom1.getName(), custom1);
    cfg.getLabelSections().put(custom2.getName(), custom2);
    String heads = "refs/heads/*";
    AccountGroup.UUID anon =
        SystemGroupBackend.getGroup(ANONYMOUS_USERS).getUUID();
    Util.allow(cfg, Permission.forLabel("Verified"), -1, 1, anon, heads);
    Util.allow(cfg, Permission.forLabel("Custom1"), -1, 1, anon, heads);
    Util.allow(cfg, Permission.forLabel("Custom2"), -1, 1, anon, heads);
    saveProjectConfig(project, cfg);

    PushOneCommit.Result r1 = createChange();
    r1.assertOkStatus();
    PushOneCommit.Result r2 = pushFactory.create(
          db, admin.getIdent(), testRepo, SUBJECT, FILE_NAME, "new content",
          r1.getChangeId())
        .to("refs/for/master");
    r2.assertOkStatus();

    ReviewInput in = new ReviewInput();
    in.label("Code-Review", 1);
    in.label("Verified", 1);
    in.label("Custom1", -1);
    in.label("Custom2", 1);
    gApi.changes().id(r2.getChangeId()).current().review(in);

    EnumSet<ListChangesOption> options = EnumSet.of(
        ListChangesOption.ALL_REVISIONS, ListChangesOption.COMMIT_FOOTERS);
    ChangeInfo actual = gApi.changes().id(r2.getChangeId()).get(options);
    assertThat(actual.revisions).hasSize(2);

    // No footers except on latest patch set.
    assertThat(actual.revisions.get(r1.getCommit().getName()).commitWithFooters)
        .isNull();

    List<String> footers =
        new ArrayList<>(Arrays.asList(
            actual.revisions.get(r2.getCommit().getName())
            .commitWithFooters.split("\\n")));
    // remove subject + blank line
    footers.remove(0);
    footers.remove(0);

    List<String> expectedFooters = Arrays.asList(
        "Change-Id: " + r2.getChangeId(),
        "Reviewed-on: "
            + canonicalWebUrl.get() + r2.getChange().getId(),
        "Reviewed-by: Administrator <admin@example.com>",
        "Custom2: Administrator <admin@example.com>",
        "Tested-by: Administrator <admin@example.com>");

    assertThat(footers).containsExactlyElementsIn(expectedFooters);
  }

  @Test
  public void defaultSearchDoesNotTouchDatabase() throws Exception {
    PushOneCommit.Result r1 = createChange();
    gApi.changes()
        .id(r1.getChangeId())
        .revision(r1.getCommit().name())
        .review(ReviewInput.approve());
    gApi.changes()
        .id(r1.getChangeId())
        .revision(r1.getCommit().name())
        .submit();

    createChange();

    setApiUserAnonymous(); // Identified user may async get stars from DB.
    atrScope.disableDb();
    assertThat(gApi.changes().query()
          .withQuery(
            "project:{" + project.get() + "} (status:open OR status:closed)")
          // Options should match defaults in AccountDashboardScreen.
          .withOption(ListChangesOption.LABELS)
          .withOption(ListChangesOption.DETAILED_ACCOUNTS)
          .withOption(ListChangesOption.REVIEWED)
          .get())
        .hasSize(2);
  }

  @Test
  public void votable() throws Exception {
    PushOneCommit.Result r = createChange();
    String triplet = project.get() + "~master~" + r.getChangeId();
    gApi.changes().id(triplet).addReviewer(user.username);
    ChangeInfo c = gApi.changes().id(triplet).get(EnumSet.of(
        ListChangesOption.DETAILED_LABELS));
    LabelInfo codeReview = c.labels.get("Code-Review");
    assertThat(codeReview.all).hasSize(1);
    ApprovalInfo approval = codeReview.all.get(0);
    assertThat(approval._accountId).isEqualTo(user.id.get());
    assertThat(approval.value).isEqualTo(0);

    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    blockLabel(cfg, "Code-Review", REGISTERED_USERS, "refs/heads/*");
    saveProjectConfig(project, cfg);
    c = gApi.changes().id(triplet).get(EnumSet.of(
        ListChangesOption.DETAILED_LABELS));
    codeReview = c.labels.get("Code-Review");
    assertThat(codeReview.all).hasSize(1);
    approval = codeReview.all.get(0);
    assertThat(approval._accountId).isEqualTo(user.id.get());
    assertThat(approval.value).isNull();
  }

  @Test
  public void pushCertificates() throws Exception {
    PushOneCommit.Result r1 = createChange();
    PushOneCommit.Result r2 = amendChange(r1.getChangeId());

    ChangeInfo info = gApi.changes()
        .id(r1.getChangeId())
        .get(EnumSet.of(
            ListChangesOption.ALL_REVISIONS,
            ListChangesOption.PUSH_CERTIFICATES));

    RevisionInfo rev1 = info.revisions.get(r1.getCommit().name());
    assertThat(rev1).isNotNull();
    assertThat(rev1.pushCertificate).isNotNull();
    assertThat(rev1.pushCertificate.certificate).isNull();
    assertThat(rev1.pushCertificate.key).isNull();

    RevisionInfo rev2 = info.revisions.get(r2.getCommit().name());
    assertThat(rev2).isNotNull();
    assertThat(rev2.pushCertificate).isNotNull();
    assertThat(rev2.pushCertificate.certificate).isNull();
    assertThat(rev2.pushCertificate.key).isNull();
  }
}