How to use the javaproperties.PropertiesFile.loads function in javaproperties

def test_propfile_neq_string():
    pf = PropertiesFile.loads('key = value\nkey: other value\n')
    assert pf != 'key = value\nkey: other value\n'
    assert 'key = value\nkey: other value\n' != pf

def test_propfile_getitem():
    pf = PropertiesFile.loads(INPUT)
    pf._check()
    assert pf["key"] == "value"
    assert pf["foo"] == "second definition"
    with pytest.raises(KeyError):
        pf["missing"]
    pf._check()

def test_propfile_set_nochange():
    pf = PropertiesFile.loads(INPUT)
    pf._check()
    assert pf["key"] == "value"
    pf["key"] = "value"
    pf._check()
    assert dict(pf) == {
        "foo": "second definition",
        "bar": "only definition",
        "key": "value",
        "zebra": "apple",
    }
    assert list(pf) == ["foo", "bar", "key", "zebra"]
    assert list(reversed(pf)) == ["zebra", "key", "bar", "foo"]
    assert pf.dumps() == '''\
# A comment before the timestamp

def test_propfile_eq_set_nochange():
    pf = PropertiesFile.loads(INPUT)
    pf2 = PropertiesFile.loads(INPUT)
    assert pf == pf2
    assert pf["key"] == pf2["key"] == "value"
    pf2["key"] = "value"
    assert pf == pf2
    assert dict(pf) == dict(pf2)
    assert pf.dumps() == INPUT
    assert pf.dumps() != pf2.dumps()

def test_propfile_eq_one_repeated_key():
    pf = PropertiesFile.loads('key = value\nkey: other value\n')
    pf2 = PropertiesFile.loads('key other value')
    assert pf == pf2
    assert dict(pf) == dict(pf2) == {"key": "other value"}

def test_propfile_eq_self():
    pf = PropertiesFile.loads(INPUT)
    assert pf == pf

def test_propfile_preserve_trailing_escape():
    pf = PropertiesFile.loads('key = value\\')
    pf._check()
    assert dict(pf) == {"key": "value"}
    assert pf.dumps() == 'key = value\\'

def test_propfile_eq_repeated_keys():
    pf = PropertiesFile.loads('key = value\nkey: other value\n')
    pf2 = PropertiesFile.loads('key: whatever\nkey other value')
    assert pf == pf2
    assert dict(pf) == dict(pf2) == {"key": "other value"}

def test_propfile_add_after_trailing_escape():
    pf = PropertiesFile.loads('key = value\\')
    pf._check()
    pf["new"] = "old"
    pf._check()
    assert dict(pf) == {"key": "value", "new": "old"}
    assert pf.dumps() == 'key = value\nnew=old\n'

def test_propfile_neq_different_comments():
    pf = PropertiesFile.loads('#This is a comment.\nkey=value\n')
    pf2 = PropertiesFile.loads('#This is also a comment.\nkey=value\n')
    assert pf != pf2
    assert dict(pf) == dict(pf2)