test_level3.py

from level3_refactor import FileServer

def run_case(name, fn):
    try:
        fn()
        print(f"[PASS] {name}")
        return True
    except Exception as e:
        print(f"[FAIL] {name} -> Exception: {e}")
        return False

def test_level3():
    passed = 0
    total = 9

    def c1():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(10, "f.txt", 50, ttl=5)
        assert fs.FILE_GET_AT(14, "f.txt") == 50
        assert fs.FILE_GET_AT(15, "f.txt") is None
    passed += run_case("TTL boundary behavior", c1)

    def c2():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "perm.txt", 1)
        assert fs.FILE_GET_AT(10000, "perm.txt") == 1
    passed += run_case("Upload without ttl lives forever", c2)

    def c3():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(10, "orig.txt", 100, ttl=20)
        fs.FILE_COPY_AT(12, "orig.txt", "c.txt")
        assert fs.FILE_GET_AT(31, "c.txt") == 100
        assert fs.FILE_GET_AT(33, "c.txt") is None
    passed += run_case("Copy inherits ttl and uses copy timestamp", c3)

    def c4():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "a.txt", 10, ttl=5)
        try:
            fs.FILE_COPY_AT(6, "a.txt", "b.txt")
        except RuntimeError:
            return
        raise AssertionError("Expected RuntimeError copying from expired source")
    passed += run_case("Copy from expired source raises", c4)

    def c5():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "f1", 10)
        fs.FILE_UPLOAD_AT(5, "f2", 20, ttl=10)
        fs.FILE_UPLOAD_AT(6, "f3", 20, ttl=2)
        res = fs.FILE_SEARCH_AT(9, "f")
        assert res == ["f2", "f1"]
    passed += run_case("FILE_SEARCH_AT filters expired files", c5)

    def c6():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "dup", 1)
        try:
            fs.FILE_UPLOAD_AT(1, "dup", 2)
        except RuntimeError:
            return
        raise AssertionError("Expected RuntimeError on duplicate timestamped upload")
    passed += run_case("Duplicate timestamped upload raises", c6)

    def c7():
        fs = FileServer()
        assert fs.FILE_GET_AT(10, "missing") is None
    passed += run_case("FILE_GET_AT missing returns None", c7)

    def c8():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "s", 5)
        fs.FILE_UPLOAD_AT(1, "t", 9)
        fs.FILE_COPY_AT(2, "t", "s")
        assert fs.FILE_GET_AT(3, "s") == 9
    passed += run_case("Copy overwrites dest with correct size", c8)

    def c9():
        fs = FileServer()
        fs.FILE_UPLOAD_AT(0, "temp.txt", 10, ttl=5)
        assert fs.FILE_GET_AT(5, "temp.txt") is None
        fs.FILE_UPLOAD_AT(6, "temp.txt", 20, ttl=5)
        assert fs.FILE_GET_AT(10, "temp.txt") == 20
    passed += run_case("Reupload after expiration allowed", c9)

    print(f"[RESULT] {passed}/{total} tests passed for Level 3.")

if __name__ == '__main__':
    test_level3()