How to use the dfvfs.path.os_path_spec.OSPathSpec function in dfvfs

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath(['vsstest.qcow2'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._qcow_path_spec = qcow_path_spec.QCOWPathSpec(parent=path_spec)

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath(['bdetogo.raw'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._bde_path_spec = bde_path_spec.BDEPathSpec(parent=path_spec)
    resolver.Resolver.key_chain.SetCredential(
        self._bde_path_spec, 'password', self._BDE_PASSWORD)

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath(['bdetogo.raw'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._bde_path_spec = bde_path_spec.BDEPathSpec(parent=path_spec)
    resolver.Resolver.key_chain.SetCredential(
        self._bde_path_spec, 'password', self._BDE_PASSWORD)

    self._file_system = bde_file_system.BDEFileSystem(self._resolver_context)
    self._file_system.Open(self._bde_path_spec)

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    super(BDEFileWithKeyChainTest, self).setUp()
    test_file = self._GetTestFilePath(['bdetogo.raw'])
    self._SkipIfPathNotExists(test_file)

    self._os_path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._bde_path_spec = bde_path_spec.BDEPathSpec(parent=self._os_path_spec)
    resolver.Resolver.key_chain.SetCredential(
        self._bde_path_spec, 'password', self._BDE_PASSWORD)

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath(['tsk_volume_system.raw'])
    self._SkipIfPathNotExists(test_file)

    self._os_path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._tsk_partition_path_spec = (
        tsk_partition_path_spec.TSKPartitionPathSpec(
            location='/', parent=self._os_path_spec))

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    test_file = self._GetTestFilePath(['apfs.raw'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    path_spec = raw_path_spec.RawPathSpec(parent=path_spec)
    self._apfs_container_path_spec = (
        apfs_container_path_spec.APFSContainerPathSpec(
            location='/', parent=path_spec))

def testFileEntryExistsByPathSpec(self):
    """Test the file entry exists by path specification functionality."""
    file_system = os_file_system.OSFileSystem(self._resolver_context)

    test_file = self._GetTestFilePath(['testdir_os', 'file1.txt'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self.assertTrue(file_system.FileEntryExistsByPathSpec(path_spec))

    test_file = self._GetTestFilePath(['testdir_os', 'file6.txt'])
    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self.assertFalse(file_system.FileEntryExistsByPathSpec(path_spec))

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    test_file = os.path.join(u'test_data', u'image.qcow2')
    self._os_path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._qcow_path_spec = qcow_path_spec.QCOWPathSpec(
        parent=self._os_path_spec)
    self._vshadow_path_spec = vshadow_path_spec.VShadowPathSpec(
        store_index=1, parent=self._qcow_path_spec)
    self._tsk_path_spec = tsk_path_spec.TSKPathSpec(
        inode=16, location=u'/a_directory/another_file',
        parent=self._vshadow_path_spec)

    self._tsk_path_spec_dict = {
        u'inode': 16,
        u'location': u'/a_directory/another_file',
        u'parent': {
            u'store_index': 1,
            u'parent': {
                u'parent': {
                    u'location': os.path.abspath(test_file)}

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath([])
    self._SkipIfPathNotExists(test_file)

    self._os_path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._os_file_system = os_file_system.OSFileSystem(self._resolver_context)

    # TODO: add RAW volume only test image.

    test_file = self._GetTestFilePath(['vsstest.qcow2'])
    self._SkipIfPathNotExists(test_file)

    path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._qcow_path_spec = qcow_path_spec.QCOWPathSpec(parent=path_spec)
    self._tsk_path_spec = tsk_path_spec.TSKPathSpec(
        location='/', parent=self._qcow_path_spec)

    self._tsk_file_system = tsk_file_system.TSKFileSystem(
        self._resolver_context)
    self._tsk_file_system.Open(self._tsk_path_spec)

def setUp(self):
    """Sets up the needed objects used throughout the test."""
    self._resolver_context = context.Context()
    test_file = self._GetTestFilePath(['syslog.zip'])
    self._SkipIfPathNotExists(test_file)

    self._os_path_spec = os_path_spec.OSPathSpec(location=test_file)
    self._zip_path_spec = zip_path_spec.ZipPathSpec(
        location='/', parent=self._os_path_spec)

    self._file_system = zip_file_system.ZipFileSystem(self._resolver_context)
    self._file_system.Open(self._zip_path_spec)