ReflogResolveTest

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package org.eclipse.jgit.lib;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.errors.RevisionSyntaxException;
import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.revwalk.RevCommit;
import org.junit.Test;

/**
 * Unit tests for resolving reflog-based revisions
 */
public class ReflogResolveTest extends RepositoryTestCase {

	@Test
	public void resolveMasterCommits() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		RevCommit c1 = git.commit().setMessage("create file").call();
		writeTrashFile("file.txt", "content2");
		git.add().addFilepattern("file.txt").call();
		RevCommit c2 = git.commit().setMessage("edit file").call();

		assertEquals(c2, db.resolve("master@{0}"));
		assertEquals(c1, db.resolve("master@{1}"));
	}

	@Test
	public void resolveUnnamedCurrentBranchCommits() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		RevCommit c1 = git.commit().setMessage("create file").call();
		writeTrashFile("file.txt", "content2");
		git.add().addFilepattern("file.txt").call();
		RevCommit c2 = git.commit().setMessage("edit file").call();

		assertEquals(c2, db.resolve("master@{0}"));
		assertEquals(c1, db.resolve("master@{1}"));

		git.checkout().setCreateBranch(true).setName("newbranch")
				.setStartPoint(c1).call();

		// same as current branch, e.g. master
		assertEquals(c1, db.resolve("@{0}"));
		try {
			assertEquals(c1, db.resolve("@{1}"));
			fail(); // Looking at wrong ref, e.g HEAD
		} catch (RevisionSyntaxException e) {
			assertNotNull(e);
		}

		// detached head, read HEAD reflog
		git.checkout().setName(c2.getName()).call();
		assertEquals(c2, db.resolve("@{0}"));
		assertEquals(c1, db.resolve("@{1}"));
		assertEquals(c2, db.resolve("@{2}"));
	}

	@Test
	public void resolveReflogParent() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		RevCommit c1 = git.commit().setMessage("create file").call();
		writeTrashFile("file.txt", "content2");
		git.add().addFilepattern("file.txt").call();
		git.commit().setMessage("edit file").call();

		assertEquals(c1, db.resolve("master@{0}~1"));
	}

	@Test
	public void resolveNonExistingBranch() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		git.commit().setMessage("create file").call();
		assertNull(db.resolve("notabranch@{7}"));
	}

	@Test
	public void resolvePreviousBranch() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		RevCommit c1 = git.commit().setMessage("create file").call();
		writeTrashFile("file.txt", "content2");
		git.add().addFilepattern("file.txt").call();
		RevCommit c2 = git.commit().setMessage("edit file").call();

		git.checkout().setCreateBranch(true).setName("newbranch")
				.setStartPoint(c1).call();

		git.checkout().setName(c1.getName()).call();

		git.checkout().setName("master").call();

		assertEquals(c1.getName(), db.simplify("@{-1}"));
		assertEquals("newbranch", db.simplify("@{-2}"));
		assertEquals("master", db.simplify("@{-3}"));

		// chained expression
		try {
			// Cannot refer to reflog of detached head
			db.resolve("@{-1}@{0}");
			fail();
		} catch (RevisionSyntaxException e) {
			// good
		}
		assertEquals(c1.getName(), db.resolve("@{-2}@{0}").getName());

		assertEquals(c2.getName(), db.resolve("@{-3}@{0}").getName());
	}

	@Test
	public void resolveDate() throws Exception {
		Git git = new Git(db);
		writeTrashFile("file.txt", "content");
		git.add().addFilepattern("file.txt").call();
		git.commit().setMessage("create file").call();
		try {
			db.resolve("master@{yesterday}");
			fail("Exception not thrown");
		} catch (RevisionSyntaxException e) {
			assertNotNull(e);
		}
	}
}