org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/CheckoutTest.java

/*
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 * This program and the accompanying materials are made available
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 * accompanies this distribution, is reproduced below, and is
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package org.eclipse.jgit.pgm;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.lib.CLIRepositoryTestCase;
import org.junit.Assert;
import org.junit.Test;

public class CheckoutTest extends CLIRepositoryTestCase {

	@Test
	public void testCheckoutSelf() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertEquals("Already on 'master'", execute("git checkout master"));
	}

	@Test
	public void testCheckoutBranch() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();
		new Git(db).branchCreate().setName("side").call();

		assertEquals("Switched to branch 'side'", execute("git checkout side"));
	}

	@Test
	public void testCheckoutNewBranch() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertEquals("Switched to a new branch 'side'",
				execute("git checkout -b side"));
	}

	@Test
	public void testCheckoutNonExistingBranch() throws Exception {
		assertEquals(
				"error: pathspec 'side' did not match any file(s) known to git.",
				execute("git checkout side"));
	}

	@Test
	public void testCheckoutNewBranchThatAlreadyExists() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertEquals("fatal: A branch named 'master' already exists.",
				execute("git checkout -b master"));
	}

	@Test
	public void testCheckoutNewBranchOnBranchToBeBorn() throws Exception {
		assertEquals("fatal: You are on a branch yet to be born",
				execute("git checkout -b side"));
	}

	@Test
	public void testCheckoutUnresolvedHead() throws Exception {
		assertEquals(
				"error: pathspec 'HEAD' did not match any file(s) known to git.",
				execute("git checkout HEAD"));
	}

	@Test
	public void testCheckoutHead() throws Exception {
		new Git(db).commit().setMessage("initial commit").call();

		assertEquals("", execute("git checkout HEAD"));
	}

	static private void assertEquals(String expected, String[] actual) {
		// if there is more than one line, ignore last one if empty
		Assert.assertEquals(
				1,
				actual.length > 1 && actual[actual.length - 1].equals("") ? actual.length - 1
						: actual.length);
		Assert.assertEquals(expected, actual[0]);
	}
}