def test_is_rst_file_blank():
    assert files.is_rst_file("") is False
def test_is_rst_file_caps():
    assert files.is_rst_file("test.RST") is True
def test_is_rst_file_not():
    assert files.is_rst_file("test.py") is False
def test_is_rst_file():
    assert files.is_rst_file("test.rst") is True