PostgreSQLGroupNodeCommentTests.java

/*
Copyright 2014 Google Inc. All Rights Reserved.

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.security.zynamics.binnavi.Database.PostgreSQL.commentTests;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.security.zynamics.binnavi.Database.Exceptions.CPartialLoadException;
import com.google.security.zynamics.binnavi.Database.Exceptions.CouldntDeleteException;
import com.google.security.zynamics.binnavi.Database.Exceptions.CouldntLoadDataException;
import com.google.security.zynamics.binnavi.Database.Exceptions.CouldntSaveDataException;
import com.google.security.zynamics.binnavi.Database.Exceptions.LoadCancelledException;
import com.google.security.zynamics.binnavi.Database.PostgreSQL.Functions.PostgreSQLCommentFunctions;
import com.google.security.zynamics.binnavi.Database.PostgreSQL.UniqueTestUserGenerator;
import com.google.security.zynamics.binnavi.Exceptions.MaybeNullException;
import com.google.security.zynamics.binnavi.Gui.GraphWindows.CommentDialogs.CComment;
import com.google.security.zynamics.binnavi.Gui.GraphWindows.CommentDialogs.Interfaces.IComment;
import com.google.security.zynamics.binnavi.Gui.Users.Interfaces.IUser;
import com.google.security.zynamics.binnavi.disassembly.INaviFunction;
import com.google.security.zynamics.binnavi.disassembly.INaviGroupNode;
import com.google.security.zynamics.binnavi.disassembly.INaviInstruction;
import com.google.security.zynamics.binnavi.disassembly.INaviModule;
import com.google.security.zynamics.binnavi.disassembly.INaviViewNode;
import com.google.security.zynamics.binnavi.disassembly.Modules.CModuleContainer;
import com.google.security.zynamics.binnavi.disassembly.types.ExpensiveBaseTest;
import com.google.security.zynamics.binnavi.disassembly.views.INaviView;
import com.google.security.zynamics.binnavi.yfileswrap.Gui.GraphWindows.Loader.CGraphBuilder;
import com.google.security.zynamics.binnavi.yfileswrap.zygraph.ZyGraph;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import java.util.ArrayList;
import java.util.List;

@RunWith(JUnit4.class)
public class PostgreSQLGroupNodeCommentTests extends ExpensiveBaseTest {
  private INaviGroupNode setupGroupNode()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {
    final INaviModule module = getProvider().loadModules().get(0);
    module.load();
    final INaviFunction function =
        module.getContent().getFunctionContainer().getFunction("sub_1004565");
    final INaviView view = module.getContent().getViewContainer().getView(function);
    view.load();

    assertEquals(42, view.getNodeCount());

    final INaviViewNode node1 = view.getContent().getBasicBlocks().get(1);
    final INaviViewNode node2 = view.getContent().getBasicBlocks().get(2);

    view.getContent().createGroupNode(Lists.newArrayList(node1, node2));

    final ZyGraph graph = CGraphBuilder.buildGraph(view);

    final INaviView nonNativeView = graph.saveAs(new CModuleContainer(getDatabase(), module),
        " TEST GROUP NODE COMMENTS ", " TESTING GROUP NODE COMMENTS ");

    INaviGroupNode savedGroupNode = null;
    for (final INaviViewNode node : nonNativeView.getGraph().getNodes()) {
      if (node instanceof INaviGroupNode) {
        savedGroupNode = (INaviGroupNode) node;
      }
    }

    return savedGroupNode;
  }

  @Test(expected = NullPointerException.class)
  public void appendGroupNodeComment1() throws CouldntSaveDataException {
    getProvider().appendGroupNodeComment(null, null, null);
  }

  @Test(expected = NullPointerException.class)
  public void appendGroupNodeComment2()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviGroupNode groupNode = setupGroupNode();

    getProvider().appendGroupNodeComment(groupNode, null, null);
  }

  @Test(expected = NullPointerException.class)
  public void appendGroupNodeComment3()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviGroupNode groupNode = setupGroupNode();

    getProvider().appendGroupNodeComment(groupNode, " FAIL ", null);
  }


  @Test
  public void appendGroupNodeComment4()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviGroupNode groupNode = setupGroupNode();

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String firstCommentString = " APPEND GROUP NODE COMMENT WITHOUT PARENT ID ";
    final Integer firstCommentId =
        getProvider().appendGroupNodeComment(groupNode, firstCommentString, user.getUserId());
    final IComment firstComment = new CComment(firstCommentId, user, null, firstCommentString);

    final String secondCommentString = " APPEND GROUP NODE COMMENT WITH PARENT ID ";
    final Integer secondCommentId =
        getProvider().appendGroupNodeComment(groupNode, secondCommentString, user.getUserId());
    final IComment secondComment =
        new CComment(secondCommentId, user, firstComment, secondCommentString);

    final ArrayList<IComment> commentsFromDatabase = getProvider().loadCommentById(secondCommentId);

    assertNotNull(commentsFromDatabase);
    assertEquals(2, commentsFromDatabase.size());
    assertTrue(commentsFromDatabase.contains(firstComment));
    assertTrue(commentsFromDatabase.contains(secondComment));

    // TODO (timkornau): check if the association to the group node did also work and not just the
    // appending under the comment id.
  }

  @Test
  public void appendInstructionCommentInGroupNode()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviModule module = getProvider().loadModules().get(0);
    module.load();
    final INaviFunction function =
        module.getContent().getFunctionContainer().getFunction("sub_1004565");
    final INaviView view = module.getContent().getViewContainer().getView(function);
    view.load();

    assertEquals(42, view.getNodeCount());

    final INaviViewNode node1 = view.getContent().getBasicBlocks().get(1);
    final INaviViewNode node2 = view.getContent().getBasicBlocks().get(2);

    view.getContent().createGroupNode(Lists.newArrayList(node1, node2));

    final ZyGraph graph = CGraphBuilder.buildGraph(view);

    final INaviView nonNativeView = graph.saveAs(new CModuleContainer(getDatabase(), module),
        " TEST INSTRUCTION COMMENTS IN GROUP NODE ", " TESTING GROUP NODE COMMENTS ");

    final INaviInstruction instruction =
        view.getContent().getBasicBlocks().get(0).getLastInstruction();
    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();
    final String firstCommentString = "TEST INSTRUCTION COMMENT PROPAGATION";
    final int firstCommentId = getProvider().appendGlobalInstructionComment(instruction,
        firstCommentString, user.getUserId());
    final IComment firstComment = new CComment(firstCommentId, user, null, firstCommentString);

    final ArrayList<IComment> commentsFromDatabase = getProvider().loadCommentById(firstCommentId);

    assertNotNull(commentsFromDatabase);
    assertEquals(1, commentsFromDatabase.size());
    assertTrue(commentsFromDatabase.contains(firstComment));

    final INaviInstruction instruction2 =
        nonNativeView.getBasicBlocks().get(0).getLastInstruction();
    assertEquals(1, instruction2.getGlobalComment().size());
  }

  @Test(expected = NullPointerException.class)
  public void deleteGroupNodeComment1() throws CouldntDeleteException {
    getProvider().deleteGroupNodeComment(null, null, null);
  }

  @Test(expected = NullPointerException.class)
  public void deleteGroupNodeComment2()
      throws CouldntDeleteException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviGroupNode groupNode = setupGroupNode();

    getProvider().deleteGroupNodeComment(groupNode, null, null);
  }

  @Test(expected = NullPointerException.class)
  public void deleteGroupNodeComment3()
      throws CouldntDeleteException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException {

    final INaviGroupNode groupNode = setupGroupNode();

    getProvider().deleteGroupNodeComment(groupNode, 1, null);
  }

  @Test
  public void deleteGroupNodeComment4()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException,
      CouldntDeleteException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> comments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment = comments.size() == 0 ? null : Iterables.getLast(comments);

    final String commentString = " TEST DELETE GROUP NODE COMMENT ";

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final int commentId =
        getProvider().appendGroupNodeComment(groupNode, commentString, user.getUserId());
    final IComment newComment = new CComment(commentId, user, lastComment, commentString);
    final ArrayList<IComment> storedComments = getProvider().loadCommentById(commentId);

    assertNotNull(storedComments);
    assertEquals(comments.size() + 1, storedComments.size());
    assertEquals(newComment, Iterables.getLast(storedComments));

    getProvider().deleteGroupNodeComment(groupNode, commentId, user.getUserId());

    final ArrayList<IComment> commentsAfterDelete = getProvider().loadCommentById(commentId);

    assertNotNull(commentsAfterDelete);
    assertTrue(commentsAfterDelete.isEmpty());
  }

  @Test(expected = CouldntDeleteException.class)
  public void deleteGroupNodeComment5()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException,
      CouldntDeleteException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> comments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment = comments.size() == 0 ? null : Iterables.getLast(comments);

    final String commentString = " TEST DELETE GROUP NODE COMMENT WRONG USER ";

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final int commentId =
        getProvider().appendGroupNodeComment(groupNode, commentString, user.getUserId());
    final IComment newComment = new CComment(commentId, user, lastComment, commentString);
    final ArrayList<IComment> storedComments = getProvider().loadCommentById(commentId);

    assertNotNull(storedComments);
    assertEquals(comments.size() + 1, storedComments.size());
    assertEquals(newComment, Iterables.getLast(storedComments));

    final IUser wrongUser = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    getProvider().deleteGroupNodeComment(groupNode, commentId, wrongUser.getUserId());
  }

  /**
   * This test checks if the delete of a comment in a series of comments works if the comment is the
   * last comment.
   *
   * <pre>
   *Comment 1:      Comment 1:
   *Comment 2:  ->  Comment 2:
   *Comment 3:
   *</pre>
   *
   */
  @Test
  public void deleteGroupNodeComment6()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException,
      CouldntDeleteException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> storedComments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment =
        storedComments.size() == 0 ? null : Iterables.getLast(storedComments);

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String comment1String = " Comment 1: ";
    final int comment1Id =
        getProvider().appendGroupNodeComment(groupNode, comment1String, user.getUserId());
    final IComment comment1 = new CComment(comment1Id, user, lastComment, comment1String);

    final String comment2String = " Comment 2: ";
    final int comment2Id =
        getProvider().appendGroupNodeComment(groupNode, comment2String, user.getUserId());
    final IComment comment2 = new CComment(comment2Id, user, comment1, comment2String);

    final String comment3String = " Comment 3: ";
    final int comment3Id =
        getProvider().appendGroupNodeComment(groupNode, comment3String, user.getUserId());
    final IComment comment3 = new CComment(comment3Id, user, comment2, comment3String);

    final ArrayList<IComment> commentsBeforeDelete = getProvider().loadCommentById(comment3Id);

    assertNotNull(commentsBeforeDelete);
    assertEquals(storedComments.size() + 3, commentsBeforeDelete.size());
    assertTrue(commentsBeforeDelete.contains(comment1));
    assertTrue(commentsBeforeDelete.contains(comment2));
    assertTrue(commentsBeforeDelete.contains(comment3));
    assertEquals(comment3, Iterables.getLast(commentsBeforeDelete));
    assertEquals(comment2, commentsBeforeDelete.get(commentsBeforeDelete.size() - 2));
    assertEquals(comment1, commentsBeforeDelete.get(commentsBeforeDelete.size() - 3));

    getProvider().deleteGroupNodeComment(groupNode, comment3Id, user.getUserId());

    final ArrayList<IComment> commentsAfterDelete1 = getProvider().loadCommentById(comment3Id);

    assertNotNull(commentsAfterDelete1);
    assertTrue(commentsAfterDelete1.isEmpty());

    final ArrayList<IComment> commentsAfterDelete2 = getProvider().loadCommentById(comment2Id);

    assertNotNull(commentsAfterDelete2);
    assertEquals(storedComments.size() + 2, commentsAfterDelete2.size());
    assertTrue(commentsAfterDelete2.contains(comment2));
    assertTrue(commentsAfterDelete2.contains(comment1));
    assertEquals(comment2, Iterables.getLast(commentsAfterDelete2));
    assertEquals(comment1, commentsAfterDelete2.get(commentsAfterDelete2.size() - 2));
  }

  /**
   * This test checks if the delete of a comment in a series of comments works if the comment is a
   * comment in the middle.
   *
   * <pre>
   *Comment 1:      Comment 1:
   *Comment 2:  ->
   *Comment 3:      Comment 3:
   *</pre>
   *
   */
  @Test
  public void deleteGroupNodeComment7()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException,
      CouldntDeleteException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> storedComments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment =
        storedComments.size() == 0 ? null : Iterables.getLast(storedComments);

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String comment1String = " Comment 1: ";
    final int comment1Id =
        getProvider().appendGroupNodeComment(groupNode, comment1String, user.getUserId());
    final IComment comment1 = new CComment(comment1Id, user, lastComment, comment1String);

    final String comment2String = " Comment 2: ";
    final int comment2Id =
        getProvider().appendGroupNodeComment(groupNode, comment2String, user.getUserId());
    final IComment comment2 = new CComment(comment2Id, user, comment1, comment2String);

    final String comment3String = " Comment 3: ";
    final int comment3Id =
        getProvider().appendGroupNodeComment(groupNode, comment3String, user.getUserId());
    final IComment comment3 = new CComment(comment3Id, user, comment2, comment3String);

    final ArrayList<IComment> commentsBeforeDelete = getProvider().loadCommentById(comment3Id);

    assertNotNull(commentsBeforeDelete);
    assertEquals(storedComments.size() + 3, commentsBeforeDelete.size());
    assertTrue(commentsBeforeDelete.contains(comment1));
    assertTrue(commentsBeforeDelete.contains(comment2));
    assertTrue(commentsBeforeDelete.contains(comment3));
    assertEquals(comment3, Iterables.getLast(commentsBeforeDelete));
    assertEquals(comment2, commentsBeforeDelete.get(commentsBeforeDelete.size() - 2));
    assertEquals(comment1, commentsBeforeDelete.get(commentsBeforeDelete.size() - 3));

    getProvider().deleteGroupNodeComment(groupNode, comment2Id, user.getUserId());

    final ArrayList<IComment> commentsAfterDelete1 = getProvider().loadCommentById(comment2Id);

    assertNotNull(commentsAfterDelete1);
    assertTrue(commentsAfterDelete1.isEmpty());

    final ArrayList<IComment> commentsAfterDelete2 = getProvider().loadCommentById(comment3Id);

    assertNotNull(commentsAfterDelete2);
    assertEquals(storedComments.size() + 2, commentsAfterDelete2.size());

    final IComment comment3AfterDelete = new CComment(comment3Id, user, comment1, comment3String);

    assertTrue(commentsAfterDelete2.contains(comment3AfterDelete));
    assertTrue(commentsAfterDelete2.contains(comment1));
    assertEquals(comment3AfterDelete, Iterables.getLast(commentsAfterDelete2));
    assertEquals(comment1, commentsAfterDelete2.get(commentsAfterDelete2.size() - 2));
  }

  /**
   * This test checks if the delete of a comment in a series of comments works if the comment is the
   * first comment.
   *
   * <pre>
   *Comment 1:
   *Comment 2:  ->  Comment 2:
   *Comment 3:      Comment 3:
   *</pre>
   *
   */
  @Test
  public void deleteGroupNodeComment8()
      throws CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException,
      CouldntSaveDataException,
      CouldntDeleteException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> storedComments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment =
        storedComments.size() == 0 ? null : Iterables.getLast(storedComments);

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String comment1String = " Comment 1: ";
    final int comment1Id =
        getProvider().appendGroupNodeComment(groupNode, comment1String, user.getUserId());
    final IComment comment1 = new CComment(comment1Id, user, lastComment, comment1String);

    final String comment2String = " Comment 2: ";
    final int comment2Id =
        getProvider().appendGroupNodeComment(groupNode, comment2String, user.getUserId());
    final IComment comment2 = new CComment(comment2Id, user, comment1, comment2String);

    final String comment3String = " Comment 3: ";
    final int comment3Id =
        getProvider().appendGroupNodeComment(groupNode, comment3String, user.getUserId());
    final IComment comment3 = new CComment(comment3Id, user, comment2, comment3String);

    final ArrayList<IComment> commentsBeforeDelete = getProvider().loadCommentById(comment3Id);

    assertNotNull(commentsBeforeDelete);
    assertEquals(storedComments.size() + 3, commentsBeforeDelete.size());
    assertTrue(commentsBeforeDelete.contains(comment1));
    assertTrue(commentsBeforeDelete.contains(comment2));
    assertTrue(commentsBeforeDelete.contains(comment3));
    assertEquals(comment3, Iterables.getLast(commentsBeforeDelete));
    assertEquals(comment2, commentsBeforeDelete.get(commentsBeforeDelete.size() - 2));
    assertEquals(comment1, commentsBeforeDelete.get(commentsBeforeDelete.size() - 3));

    getProvider().deleteGroupNodeComment(groupNode, comment1Id, user.getUserId());

    final ArrayList<IComment> commentsAfterDelete1 = getProvider().loadCommentById(comment1Id);

    assertNotNull(commentsAfterDelete1);
    assertTrue(commentsAfterDelete1.isEmpty());

    final ArrayList<IComment> commentsAfterDelete2 = getProvider().loadCommentById(comment3Id);

    final IComment comment2AfterDelete =
        new CComment(comment2Id, user, lastComment, comment2String);
    final IComment comment3AfterDelete =
        new CComment(comment3Id, user, comment2AfterDelete, comment3String);


    assertNotNull(commentsAfterDelete2);
    assertEquals(storedComments.size() + 2, commentsAfterDelete2.size());
    assertTrue(commentsAfterDelete2.contains(comment3AfterDelete));
    assertTrue(commentsAfterDelete2.contains(comment2AfterDelete));
    assertEquals(comment3AfterDelete, Iterables.getLast(commentsAfterDelete2));
    assertEquals(comment2AfterDelete, commentsAfterDelete2.get(commentsAfterDelete2.size() - 2));
  }

  @Test(expected = NullPointerException.class)
  public void editGroupNodeComment1() throws CouldntSaveDataException {
    getProvider().editGroupNodeComment(null, 1, 1, "");
  }

  @Test(expected = NullPointerException.class)
  public void editGroupNodeComment2()
      throws CouldntSaveDataException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException {

    final INaviGroupNode groupNode = setupGroupNode();
    getProvider().editGroupNodeComment(groupNode, null, 1, "");
  }

  @Test(expected = NullPointerException.class)
  public void editGroupNodeComment3()
      throws CouldntSaveDataException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException {

    final INaviGroupNode groupNode = setupGroupNode();
    getProvider().editGroupNodeComment(groupNode, 1, null, "");
  }

  @Test(expected = NullPointerException.class)
  public void editGroupNodeComment4()
      throws CouldntSaveDataException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException {

    final INaviGroupNode groupNode = setupGroupNode();
    getProvider().editGroupNodeComment(groupNode, 1, 1, null);
  }

  @Test
  public void editGroupNodeComment5()
      throws CouldntSaveDataException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> comments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment = comments.size() == 0 ? null : Iterables.getLast(comments);

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String commentText = " GROUP NODE COMMENT TEST BEFORE EDIT ";

    final Integer commentId =
        getProvider().appendGroupNodeComment(groupNode, commentText, user.getUserId());

    final IComment newComment = new CComment(commentId, user, lastComment, commentText);

    final ArrayList<IComment> newComments = getProvider().loadCommentById(commentId);

    assertNotNull(newComments);
    assertEquals(comments.size() + 1, newComments.size());
    assertEquals(newComment, Iterables.getLast(newComments));

    final String commentAfterEdit = " GROUP NODE COMMENT TEST AFTER EDIT ";

    getProvider().editGroupNodeComment(groupNode, commentId, user.getUserId(), commentAfterEdit);
    final ArrayList<IComment> commentsAfterEdit =
        PostgreSQLCommentFunctions.loadCommentByCommentId(getProvider(), commentId);

    assertEquals(commentAfterEdit, Iterables.getLast(commentsAfterEdit).getComment());

    assertEquals(commentsAfterEdit.size(), newComments.size());
  }

  @Test(expected = CouldntSaveDataException.class)
  public void editGroupNodeComment6()
      throws CouldntSaveDataException,
      CouldntLoadDataException,
      LoadCancelledException,
      MaybeNullException,
      CPartialLoadException {

    final INaviGroupNode groupNode = setupGroupNode();

    final List<IComment> comments =
        groupNode.getComments() == null ? new ArrayList<IComment>() : groupNode.getComments();
    final IComment lastComment = comments.size() == 0 ? null : Iterables.getLast(comments);

    final IUser user = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    final String commentText = " CODE NODE COMMENT TEST BEFORE EDIT ";

    final Integer commentId =
        getProvider().appendGroupNodeComment(groupNode, commentText, user.getUserId());

    final IComment newComment = new CComment(commentId, user, lastComment, commentText);

    final ArrayList<IComment> newComments = getProvider().loadCommentById(commentId);

    assertNotNull(newComments);
    assertEquals(comments.size() + 1, newComments.size());
    assertEquals(newComment, Iterables.getLast(newComments));

    final IUser wrongUser = new UniqueTestUserGenerator(getProvider()).nextActiveUser();

    getProvider().editGroupNodeComment(groupNode, commentId, wrongUser.getUserId(), " FAIL ");
  }
}