How to use the kas.kas function in kas

def test_patch(changedir, tmpdir):
    tdir = str(tmpdir.mkdir('test_patch'))
    shutil.rmtree(tdir, ignore_errors=True)
    shutil.copytree('tests/test_patch', tdir)
    os.chdir(tdir)
    kas.kas(['shell', 'test.yml', '-c', 'true'])
    for f in ['kas/tests/test_patch/hello.sh', 'hello/hello.sh']:
        assert os.stat(f)[stat.ST_MODE] & stat.S_IXUSR
    kas.kas(['shell', 'test.yml', '-c', 'true'])

kas.kas(['shell', 'test.yml', '-c', 'true'])
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)
    assert rc != 0
    assert output.strip() == ''
    (rc, output) = run_cmd(['git', 'rev-parse', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == '907816a5c4094b59a36aec12226e71c461c05b77'
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas2',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == 'refs/heads/master'

    kas.kas(['shell', 'test2.yml', '-c', 'true'])
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == 'refs/heads/master'
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas2',
                           fail=False, liveupdate=False)
    assert rc != 0
    assert output.strip() == ''
    (rc, output) = run_cmd(['git', 'rev-parse', '-q', 'HEAD'], cwd='kas2',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == '907816a5c4094b59a36aec12226e71c461c05b77'

def test_refspec_switch(changedir, tmpdir):
    """
        Test that the local git clone is correctly updated when switching
        between a commit hash refspec and a branch refspec.
    """
    tdir = str(tmpdir.mkdir('test_refspec_switch'))
    shutil.rmtree(tdir, ignore_errors=True)
    shutil.copytree('tests/test_refspec', tdir)
    os.chdir(tdir)

    kas.kas(['shell', 'test.yml', '-c', 'true'])
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)
    assert rc != 0
    assert output.strip() == ''
    (rc, output) = run_cmd(['git', 'rev-parse', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == '907816a5c4094b59a36aec12226e71c461c05b77'
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas2',
                           fail=False, liveupdate=False)
    assert rc == 0
    assert output.strip() == 'refs/heads/master'

    kas.kas(['shell', 'test2.yml', '-c', 'true'])
    (rc, output) = run_cmd(['git', 'symbolic-ref', '-q', 'HEAD'], cwd='kas',
                           fail=False, liveupdate=False)

def test_patch(changedir, tmpdir):
    tdir = str(tmpdir.mkdir('test_patch'))
    shutil.rmtree(tdir, ignore_errors=True)
    shutil.copytree('tests/test_patch', tdir)
    os.chdir(tdir)
    kas.kas(['shell', 'test.yml', '-c', 'true'])
    for f in ['kas/tests/test_patch/hello.sh', 'hello/hello.sh']:
        assert os.stat(f)[stat.ST_MODE] & stat.S_IXUSR
    kas.kas(['shell', 'test.yml', '-c', 'true'])