Functionality test

[ssyssy]

No description provided.

[LuQQiu]

Every test has its own designed usage
can you add the test cases to another general functionality test focus test instead of keep adding to the existing cat_file test

[LuQQiu]

@ssyssy Cat test was added for testing the intense cat operations

    for _ in range(NUM_TESTS):
        offset = random.randint(0, file_size - 1)
        length = min(random.randint(1, file_size - offset), max_length)
        validate_read_range(
            alluxio_file_system,
            alluxio_path,
            local_path,
            offset,
            length,
        )

    LOGGER.debug(
        f"Data matches between Alluxio file and local source file for {NUM_TESTS} times"
    )

    special_test_cases = [
        (file_size - 1, -1),
        (file_size - 1, file_size + 1),
        (file_size, 100),
    ]

can you keep it as it is?

Basic functionality test can be in other test classes

[LuQQiu]

LGTM