MergeBuilderTest.java

/*
 * Copyright 2000-2017 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 com.intellij.openapi.diff.impl.incrementalMerge;

import com.intellij.idea.IdeaLogger;
import com.intellij.openapi.diff.impl.highlighting.FragmentSide;
import com.intellij.openapi.diff.impl.util.ContextLogger;
import com.intellij.openapi.util.TextRange;
import com.intellij.util.Assertion;
import junit.framework.TestCase;

import java.util.List;

public class MergeBuilderTest extends TestCase {
  private final MergeBuilder myMergeBuilder = new MergeBuilder(new ContextLogger("TEST"));
  private final Assertion CHECK = new Assertion();

  public void testEqual() {
    addLeft(new TextRange(0, 1), new TextRange(0, 1));
    addRight(new TextRange(0, 1), new TextRange(0, 1));
    CHECK.empty(finish(1, 1, 1));
  }

  public void testWholeConflict() {
    CHECK.singleElement(finish(1, 2, 3),
                        fragment(new TextRange(0, 1), new TextRange(0, 2), new TextRange(0, 3)));
  }

  public void testTailInsert() {
    TextRange range = new TextRange(0, 1);
    addLeft(range, range);
    addRight(range, range);
    CHECK.singleElement(finish(1, 1, 2),
                        fragment(new TextRange(1, 1), new TextRange(1, 1), new TextRange(1, 2)));
  }

  public void testSameInsertsConflicts1() {
    TextRange base = new TextRange(0, 1);
    TextRange version = new TextRange(1, 2);
    addLeft(base, version);
    addRight(base, version);
    CHECK.singleElement(finish(2, 1, 2),
                        fragment(new TextRange(0, 1), new TextRange(0, 0), new TextRange(0, 1)));
  }

  public void testSameInsertsConflicts2() {
    TextRange base = new TextRange(1, 2);
    TextRange version = new TextRange(0, 1);
    addLeft(base, version);
    addRight(base, version);
    CHECK.compareAll(new MergeFragment[]{
      fragment(new TextRange(0, 0), new TextRange(0, 1), new TextRange(0, 0)),
      fragment(new TextRange(1, 2), new TextRange(2, 2), new TextRange(1, 2))
    }, finish(2, 2, 2));
  }

  public void testHeadInsert() {
    TextRange range = new TextRange(0, 1);
    addRight(range, new TextRange(1, 2));
    addLeft(range, range);
    CHECK.singleElement(finish(1, 1, 2),
                        fragment(new TextRange(0, 0), new TextRange(0, 0), new TextRange(0, 1)));
  }

  public void testOneSideChange() {
    addRight(new TextRange(0, 2), new TextRange(0, 2));
    addLeft(new TextRange(1, 2), new TextRange(2, 3));
    CHECK.singleElement(finish(3, 2, 2),
                        fragment(new TextRange(0, 2), new TextRange(0, 1), new TextRange(0, 1)));
  }

  public void testNotAllignedConflict() {
    addLeft(new TextRange(1, 3), new TextRange(0, 2));
    addRight(new TextRange(2, 4), new TextRange(1, 3));
    CHECK.compareAll(new MergeFragment[]{
      fragment(new TextRange(0, 1), new TextRange(0, 2), new TextRange(0, 1)),
      fragment(new TextRange(2, 3), new TextRange(3, 4), new TextRange(2, 3))
    }, finish(3, 4, 3));
  }

  public void testBug() {
    addRight(new TextRange(0, 1), new TextRange(0, 1));
    addLeft(new TextRange(0, 2), new TextRange(0, 2));
    CHECK.compareAll(new MergeFragment[]{
      fragment(new TextRange(1, 3), new TextRange(1, 2), new TextRange(1, 1)),
    }, finish(3, 2, 1));
  }

  public void testMultiChanges() {
    addLeft(new TextRange(1, 8), new TextRange(1, 8));
    addRight(new TextRange(1, 2), new TextRange(0, 1));
    addRight(new TextRange(3, 4), new TextRange(1, 2));
    addRight(new TextRange(4, 5), new TextRange(3, 4));
    addRight(new TextRange(6, 7), new TextRange(5, 6));
    addLeft(new TextRange(9, 10), new TextRange(9, 10));
    CHECK.compareAll(new MergeFragment[]{
      fragment(new TextRange(0, 1), new TextRange(0, 1), new TextRange(0, 0)),
      fragment(new TextRange(2, 3), new TextRange(2, 3), new TextRange(1, 1)),
      fragment(new TextRange(4, 4), new TextRange(4, 4), new TextRange(2, 3)),
      fragment(new TextRange(5, 6), new TextRange(5, 6), new TextRange(4, 5)),
      fragment(new TextRange(7, 10), new TextRange(7, 10), new TextRange(6, 7))
    }, finish(10, 10, 7));
  }

  public void testNoIntersection() {
    addLeft(new TextRange(0, 1), new TextRange(0, 1));
    addRight(new TextRange(0, 2), new TextRange(0, 2));
    addLeft(new TextRange(3, 5), new TextRange(1, 3));
    addRight(new TextRange(4, 5), new TextRange(2, 3));
    CHECK.compareAll(new MergeFragment[]{
      fragment(new TextRange(1, 2), new TextRange(1, 4), new TextRange(1, 2))
    }, finish(3, 5, 3));
  }

  private MergeFragment fragment(TextRange left, TextRange base, TextRange right) {
    return new MergeFragment(left, base, right);
  }

  private void addRight(TextRange base, TextRange right) {
    myMergeBuilder.add(base, right, FragmentSide.SIDE2);
  }

  private void addLeft(TextRange base, TextRange left) {
    myMergeBuilder.add(base, left, FragmentSide.SIDE1);
  }

  private List<MergeFragment> finish(int left, int base, int right) {
    return myMergeBuilder.finish(left, base, right);
  }

  @Override
  protected void runTest() throws Throwable {
    try {
      super.runTest();
    }
    finally {
      if (IdeaLogger.ourErrorsOccurred != null) throw IdeaLogger.ourErrorsOccurred;
    }
  }

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    IdeaLogger.ourErrorsOccurred = null;
  }
}