jgit/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/DiffEntryTest.java

/*
 * Copyright (C) 2011, Dariusz Luksza <dariusz@luksza.org>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
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 *   with the distribution.
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 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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package org.eclipse.jgit.diff;

import static org.eclipse.jgit.diff.DiffEntry.DEV_NULL;
import static org.eclipse.jgit.util.FileUtils.delete;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.notNullValue;
import static org.junit.Assert.assertThat;

import java.io.File;
import java.util.List;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.lib.RepositoryTestCase;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.treewalk.EmptyTreeIterator;
import org.eclipse.jgit.treewalk.FileTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.util.FileUtils;
import org.junit.Test;

public class DiffEntryTest extends RepositoryTestCase {

	@Test
	public void shouldListAddedFileInInitialCommit() throws Exception {
		// given
		writeTrashFile("a.txt", "content");
		Git git = new Git(db);
		git.add().addFilepattern("a.txt").call();
		RevCommit c = git.commit().setMessage("initial commit").call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(new EmptyTreeIterator());
		walk.addTree(c.getTree());
		List<DiffEntry> result = DiffEntry.scan(walk);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getChangeType(), is(ChangeType.ADD));
		assertThat(entry.getNewPath(), is("a.txt"));
		assertThat(entry.getOldPath(), is(DEV_NULL));
	}

	@Test
	public void shouldListAddedFileBetweenTwoCommits() throws Exception {
		// given
		Git git = new Git(db);
		RevCommit c1 = git.commit().setMessage("initial commit").call();
		writeTrashFile("a.txt", "content");
		git.add().addFilepattern("a.txt").call();
		RevCommit c2 = git.commit().setMessage("second commit").call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c1.getTree());
		walk.addTree(c2.getTree());
		List<DiffEntry> result = DiffEntry.scan(walk);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getChangeType(), is(ChangeType.ADD));
		assertThat(entry.getNewPath(), is("a.txt"));
		assertThat(entry.getOldPath(), is(DEV_NULL));
	}

	@Test
	public void shouldListModificationBetweenTwoCommits() throws Exception {
		// given
		Git git = new Git(db);
		File file = writeTrashFile("a.txt", "content");
		git.add().addFilepattern("a.txt").call();
		RevCommit c1 = git.commit().setMessage("initial commit").call();
		write(file, "new content");
		RevCommit c2 = git.commit().setAll(true).setMessage("second commit")
				.call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c1.getTree());
		walk.addTree(c2.getTree());
		List<DiffEntry> result = DiffEntry.scan(walk);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getChangeType(), is(ChangeType.MODIFY));
		assertThat(entry.getNewPath(), is("a.txt"));
	}

	@Test
	public void shouldListDeletionBetweenTwoCommits() throws Exception {
		// given
		Git git = new Git(db);
		File file = writeTrashFile("a.txt", "content");
		git.add().addFilepattern("a.txt").call();
		RevCommit c1 = git.commit().setMessage("initial commit").call();
		delete(file);
		RevCommit c2 = git.commit().setAll(true).setMessage("delete a.txt")
				.call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c1.getTree());
		walk.addTree(c2.getTree());
		List<DiffEntry> result = DiffEntry.scan(walk);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getOldPath(), is("a.txt"));
		assertThat(entry.getNewPath(), is(DEV_NULL));
		assertThat(entry.getChangeType(), is(ChangeType.DELETE));
	}

	@Test
	public void shouldListModificationInDirWithoutModifiedTrees()
			throws Exception {
		// given
		Git git = new Git(db);
		File tree = new File(new File(db.getWorkTree(), "a"), "b");
		FileUtils.mkdirs(tree);
		File file = new File(tree, "c.txt");
		FileUtils.createNewFile(file);
		write(file, "content");
		git.add().addFilepattern("a").call();
		RevCommit c1 = git.commit().setMessage("initial commit").call();
		write(file, "new line");
		RevCommit c2 = git.commit().setAll(true).setMessage("second commit")
				.call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c1.getTree());
		walk.addTree(c2.getTree());
		walk.setRecursive(true);
		List<DiffEntry> result = DiffEntry.scan(walk);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getChangeType(), is(ChangeType.MODIFY));
		assertThat(entry.getNewPath(), is("a/b/c.txt"));
	}

	@Test
	public void shouldListModificationInDirWithModifiedTrees() throws Exception {
		// given
		Git git = new Git(db);
		File tree = new File(new File(db.getWorkTree(), "a"), "b");
		FileUtils.mkdirs(tree);
		File file = new File(tree, "c.txt");
		FileUtils.createNewFile(file);
		write(file, "content");
		git.add().addFilepattern("a").call();
		RevCommit c1 = git.commit().setMessage("initial commit").call();
		write(file, "new line");
		RevCommit c2 = git.commit().setAll(true).setMessage("second commit")
				.call();

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c1.getTree());
		walk.addTree(c2.getTree());
		List<DiffEntry> result = DiffEntry.scan(walk, true);

		// then
		assertThat(result, notNullValue());
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(3)));

		DiffEntry entry = result.get(0);
		assertThat(entry.getChangeType(), is(ChangeType.MODIFY));
		assertThat(entry.getNewPath(), is("a"));

		entry = result.get(1);
		assertThat(entry.getChangeType(), is(ChangeType.MODIFY));
		assertThat(entry.getNewPath(), is("a/b"));

		entry = result.get(2);
		assertThat(entry.getChangeType(), is(ChangeType.MODIFY));
		assertThat(entry.getNewPath(), is("a/b/c.txt"));
	}

	@Test
	public void shouldListChangesInWorkingTree() throws Exception {
		// given
		writeTrashFile("a.txt", "content");
		Git git = new Git(db);
		git.add().addFilepattern("a.txt").call();
		RevCommit c = git.commit().setMessage("initial commit").call();
		writeTrashFile("b.txt", "new line");

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(c.getTree());
		walk.addTree(new FileTreeIterator(db));
		List<DiffEntry> result = DiffEntry.scan(walk, true);

		// then
		assertThat(Integer.valueOf(result.size()), is(Integer.valueOf(1)));
		DiffEntry entry = result.get(0);

		assertThat(entry.getChangeType(), is(ChangeType.ADD));
		assertThat(entry.getNewPath(), is("b.txt"));
	}

	@Test(expected = IllegalArgumentException.class)
	public void shouldThrowIAEWhenTreeWalkHasLessThanTwoTrees()
			throws Exception {
		// given - we don't need anything here

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(new EmptyTreeIterator());
		DiffEntry.scan(walk);
	}

	@Test(expected = IllegalArgumentException.class)
	public void shouldThrowIAEWhenTreeWalkHasMoreThanTwoTrees()
			throws Exception {
		// given - we don't need anything here

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(new EmptyTreeIterator());
		walk.addTree(new EmptyTreeIterator());
		walk.addTree(new EmptyTreeIterator());
		DiffEntry.scan(walk);
	}

	@Test(expected = IllegalArgumentException.class)
	public void shouldThrowIAEWhenScanShouldIncludeTreesAndWalkIsRecursive()
			throws Exception {
		// given - we don't need anything here

		// when
		TreeWalk walk = new TreeWalk(db);
		walk.addTree(new EmptyTreeIterator());
		walk.addTree(new EmptyTreeIterator());
		walk.setRecursive(true);
		DiffEntry.scan(walk, true);
	}

}