def test_ls_abominate():
    """recursive list of directory"""
    # setup
    mkdir('work')
    with cd('work'):
        d1 = to_path('d1')
        mkdir(d1)
        d1d1 = to_path('d1/d1')
        mkdir(d1d1)
        d1d2 = to_path('d1/d2')
        mkdir(d1d2)
        d1d1f1 = to_path('d1/d1/f1')
        touch(d1d1f1)
        d1d2f2 = to_path('d1/d2/f2')
        touch(d1d2f2)

        # run test
        paths = ls('.', select='**/*')

        # check
        assert set(str(f) for f in paths) == set(
           ['d1', 'd1/d1', 'd1/d2', 'd1/d1/f1', 'd1/d2/f2']
        )

    # cleanup
    rm('work')

def test_rm_downturn():
    """remove existing file"""
    # setup
    f1 = to_path('f1')
    touch(f1)

    # run test
    rm(f1)

    # check
    assert not f1.exists()

def test_mkdir_cymbal():
    """attempt to make a directory over an existing file"""
    # setup
    f1 = to_path('f1')
    touch(f1)

    # run test
    with pytest.raises(OSError):
        mkdir(f1)

    # cleanup
    rm(f1)

def test_touch_endorse():
    """touch a new file"""
    # setup
    f1 = to_path('f1')

    # run test
    touch(f1)

    # check
    assert f1.is_file()

    # cleanup
    rm(f1)

def test_touch_downturn():
    """touch an existing file"""
    # setup
    f1 = to_path('f1')
    touch(f1)

    # run test
    touch(f1)

    # check
    assert f1.is_file()

    # cleanup
    rm(f1)

def test_ln_ground():
    """link to a pre-existing name"""
    # setup
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')
    touch(f2)

    # run test
    with pytest.raises(OSError):
        ln(f1, f2)

    # cleanup
    rm(f1, f2)

def test_rm_ground():
    """remove two files"""
    # setup
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')
    touch(f2)

    # run test
    rm(f1, f2)

    # check
    assert not f1.exists()
    assert not f2.exists()

def test_cp_dealer():
    """copy two files into a nonexistent directory"""
    # setup
    d1 = 'd1'
    f1 = 'f1'
    touch(f1)
    f2 = 'f2'
    touch(f2)

    # run test
    with pytest.raises(OSError):
        cp([f1, f2], d1)

    # cleanup
    rm(f1, f2)

def test_mv_cymbal():
    """move two files to a new directory"""
    # setup
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')
    touch(f2)
    d1 = to_path('d2')

    # run test
    with pytest.raises(OSError):
        mv(f1, f2, d1)

    # cleanup
    rm(f1, f2, d1)

def test_touch_cymbal():
    """touch multiple files"""
    # setup
    f1 = to_path('f1')
    f2 = to_path('f2')

    # run test
    touch([f1, f2])

    # check
    assert f1.is_file()
    assert f2.is_file()

    # cleanup
    rm(f1, f2)

def test_mv_incense():
    """move two files into a nonexistent directory"""
    # setup
    d1 = to_path('d1')
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')
    touch(f2)

    # run test
    with pytest.raises(OSError):
        mv([f1, f2], d1)

    # cleanup
    rm(d1, f1, f2)

def test_cp_cymbal():
    """copy two files to a new directory"""
    # setup
    d1 = to_path('d1')
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')
    touch(f2)

    # run test
    with pytest.raises(OSError):
        cp(f1, f2, d1)

    # cleanup
    rm(f1, f2, d1)

def test_cp_downturn():
    """copy file to new file"""
    # setup
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')

    # run test
    cp(f1, f2)

    # check
    assert f2.is_file()

    # cleanup
    rm(f1, f2)

def test_cp_adieu():
    """copy two files to a new directory"""
    # setup
    d1 = 'd1'
    f1 = 'f1'
    touch(f1)
    f2 = 'f2'
    touch(f2)

    # run test
    with pytest.raises(OSError):
        cp(f1, f2, d1)

    # cleanup
    rm(f1, f2, d1)

def test_cp_demystify():
    """copy file to new file"""
    # setup
    f1 = 'f1'
    touch(f1)
    f2 = 'f2'

    # run test
    cp(f1, f2)

    # check
    assert to_path(f2).is_file()

    # cleanup
    rm(f1, f2)

def test_mv_downturn():
    """rename file"""
    # setup
    f1 = to_path('f1')
    touch(f1)
    f2 = to_path('f2')

    # run test
    mv(f1, f2)

    # check
    assert f2.is_file()
    assert not f1.exists()

    # cleanup
    rm(f1, f2)

def test_rm_cymbal():
    """remove directory"""
    # setup
    d1 = to_path('d1')
    mkdir(d1)
    d1f1 = to_path('d1/f1')
    touch(d1f1)
    f2 = to_path('f2')
    touch(f2)

    # run test
    rm(d1, f2)

    # check
    assert not d1.exists()
    assert not f2.exists()

def test_cp_gathering():
    """copy file into an existing directory"""
    # setup
    d1 = to_path('d1')
    mkdir(d1)
    f1 = to_path('f1')
    touch(f1)

    # run test
    cp(f1, d1)

    # check
    assert to_path('d1/f1').is_file()

    # cleanup
    rm(d1)

def test_lsf_rissole():
    """list files"""
    # setup
    f1 = to_path("f1")
    touch(f1)
    f2 = to_path("f2")
    touch(f2)

    # run test
    files = lsf(f1, f2)

    # check
    assert set(str(f) for f in files) == set(["f1", "f2"])

    # cleanup
    rm(f1, f2)

def test_lsf_narrow():
    """list files with select constraint"""
    # setup
    f1 = to_path("f1")
    touch(f1)
    f2 = to_path("f2")
    touch(f2)

    # run test
    files = lsf(f1, f2, select="*2")

    # check
    assert set(str(f) for f in files) == set(["f2"])

    # cleanup
    rm(f1, f2)