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diff --git a/plugins/git4idea/tests/git4idea/test/MockVcsHelper.java b/plugins/git4idea/tests/git4idea/test/MockVcsHelper.java
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@@ -0,0 +1,225 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * 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 git4idea.test;
+
+import com.intellij.ide.errorTreeView.HotfixData;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vcs.*;
+import com.intellij.openapi.vcs.annotate.AnnotationProvider;
+import com.intellij.openapi.vcs.annotate.FileAnnotation;
+import com.intellij.openapi.vcs.changes.Change;
+import com.intellij.openapi.vcs.changes.CommitResultHandler;
+import com.intellij.openapi.vcs.changes.LocalChangeList;
+import com.intellij.openapi.vcs.history.VcsFileRevision;
+import com.intellij.openapi.vcs.history.VcsHistoryProvider;
+import com.intellij.openapi.vcs.merge.MergeDialogCustomizer;
+import com.intellij.openapi.vcs.merge.MergeProvider;
+import com.intellij.openapi.vcs.versionBrowser.ChangeBrowserSettings;
+import com.intellij.openapi.vcs.versionBrowser.CommittedChangeList;
+import com.intellij.openapi.vfs.VirtualFile;
+import org.jetbrains.annotations.Nls;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.awt.*;
+import java.io.File;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class MockVcsHelper extends AbstractVcsHelper {
+  private volatile boolean myCommitDialogShown;
+  private volatile boolean myMergeDialogShown;
+
+  private CommitHandler myCommitHandler;
+  private MergeHandler myMergeHandler;
+
+  public MockVcsHelper(@NotNull Project project) {
+    super(project);
+  }
+
+  @Override
+  public void showErrors(List<VcsException> abstractVcsExceptions, @NotNull String tabDisplayName) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showErrors(Map<HotfixData, List<VcsException>> exceptionGroups, @NotNull String tabDisplayName) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public List<VcsException> runTransactionRunnable(AbstractVcs vcs, TransactionRunnable runnable, Object vcsParameters) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showAnnotation(FileAnnotation annotation, VirtualFile file, AbstractVcs vcs) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showDifferences(VcsFileRevision cvsVersionOn, VcsFileRevision cvsVersionOn1, File file) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showChangesListBrowser(CommittedChangeList changelist, @Nls String title) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showChangesBrowser(List<CommittedChangeList> changelists) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showChangesBrowser(List<CommittedChangeList> changelists, @Nls String title) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showChangesBrowser(CommittedChangesProvider provider,
+                                 RepositoryLocation location,
+                                 @Nls String title,
+                                 @Nullable Component parent) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showWhatDiffersBrowser(@Nullable Component parent, Collection<Change> changes, @Nls String title) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public <T extends CommittedChangeList, U extends ChangeBrowserSettings> T chooseCommittedChangeList(@NotNull CommittedChangesProvider<T, U> provider,
+                                                                                                      RepositoryLocation location) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void openCommittedChangesTab(AbstractVcs vcs, VirtualFile root, ChangeBrowserSettings settings, int maxCount, String title) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void openCommittedChangesTab(CommittedChangesProvider provider,
+                                      RepositoryLocation location,
+                                      ChangeBrowserSettings settings,
+                                      int maxCount,
+                                      String title) {
+    throw new UnsupportedOperationException();
+  }
+
+  @NotNull
+  @Override
+  public List<VirtualFile> showMergeDialog(List<VirtualFile> files,
+                                           MergeProvider provider,
+                                           @NotNull MergeDialogCustomizer mergeDialogCustomizer) {
+    myMergeDialogShown = true;
+    if (myMergeHandler != null) {
+      myMergeHandler.showMergeDialog();
+    }
+    return Collections.emptyList();
+  }
+
+  public boolean mergeDialogWasShown() {
+    return myMergeDialogShown;
+  }
+
+  @Override
+  public void showFileHistory(VcsHistoryProvider vcsHistoryProvider, FilePath path, AbstractVcs vcs, String repositoryPath) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showFileHistory(VcsHistoryProvider vcsHistoryProvider,
+                              AnnotationProvider annotationProvider,
+                              FilePath path,
+                              String repositoryPath,
+                              AbstractVcs vcs) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void showRollbackChangesDialog(List<Change> changes) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public Collection<VirtualFile> selectFilesToProcess(List<VirtualFile> files,
+                                                      String title,
+                                                      @Nullable String prompt,
+                                                      String singleFileTitle,
+                                                      String singleFilePromptTemplate,
+                                                      VcsShowConfirmationOption confirmationOption) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public Collection<FilePath> selectFilePathsToProcess(List<FilePath> files,
+                                                       String title,
+                                                       @Nullable String prompt,
+                                                       String singleFileTitle,
+                                                       String singleFilePromptTemplate,
+                                                       VcsShowConfirmationOption confirmationOption) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean commitChanges(@NotNull Collection<Change> changes, @NotNull LocalChangeList initialChangeList,
+                               @NotNull String commitMessage, @Nullable CommitResultHandler customResultHandler) {
+    myCommitDialogShown = true;
+    if (myCommitHandler != null) {
+      boolean success = myCommitHandler.commit(commitMessage);
+      if (customResultHandler != null) {
+        if (success) {
+          customResultHandler.onSuccess(commitMessage);
+        }
+        else {
+          customResultHandler.onFailure();
+        }
+      }
+      return success;
+    }
+    if (customResultHandler != null) {
+      customResultHandler.onFailure();
+    }
+    return false;
+  }
+
+  public void registerHandler(CommitHandler handler) {
+    myCommitHandler = handler;
+  }
+
+  public void registerHandler(MergeHandler handler) {
+    myMergeHandler = handler;
+  }
+
+  public boolean commitDialogWasShown() {
+    return myCommitDialogShown;
+  }
+
+  public interface CommitHandler {
+    boolean commit(String commitMessage);
+  }
+
+  public interface MergeHandler {
+    void showMergeDialog();
+  }
+
+}