mirror of
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233 lines
7.9 KiB
Python
233 lines
7.9 KiB
Python
"""Tests for the cache.py module."""
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import datetime
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import time
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from unittest.mock import patch
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from fastmcp.utilities.cache import TimedCache
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class TestTimedCache:
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"""Tests for the TimedCache class."""
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def test_init(self):
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"""Test that a TimedCache can be initialized with an expiration."""
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expiration = datetime.timedelta(seconds=10)
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cache = TimedCache(expiration)
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assert cache.expiration == expiration
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assert isinstance(cache.cache, dict)
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assert len(cache.cache) == 0
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def test_set(self):
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"""Test that values can be set in the cache."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key, value = "test_key", "test_value"
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with patch("datetime.datetime") as mock_datetime:
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now = datetime.datetime(2023, 1, 1, tzinfo=datetime.timezone.utc)
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mock_datetime.now.return_value = now
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cache.set(key, value)
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# Check that the value is stored with the correct expiration
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assert key in cache.cache
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stored_value, expiration = cache.cache[key]
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assert stored_value == value
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assert expiration == now + datetime.timedelta(seconds=10)
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def test_get_found(self):
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"""Test retrieving a value that exists and has not expired."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key, value = "test_key", "test_value"
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# Set a future expiration time
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future = datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(
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seconds=30
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)
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cache.cache[key] = (value, future)
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# The value should be returned
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assert cache.get(key) == value
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def test_get_expired(self):
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"""Test retrieving a value that exists but has expired."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key, value = "test_key", "test_value"
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# Set a past expiration time
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past = datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(
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seconds=1
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)
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cache.cache[key] = (value, past)
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# Should return NOT_FOUND
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assert cache.get(key) is TimedCache.NOT_FOUND
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def test_get_not_found(self):
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"""Test retrieving a value that doesn't exist in the cache."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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# Key doesn't exist
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assert cache.get("nonexistent_key") is TimedCache.NOT_FOUND
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def test_clear(self):
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"""Test that the cache can be cleared."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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# Add some items
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cache.set("key1", "value1")
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cache.set("key2", "value2")
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assert len(cache.cache) == 2
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# Clear the cache
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cache.clear()
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assert len(cache.cache) == 0
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def test_real_expiration(self):
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"""Test that values actually expire after the specified time."""
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# Use a very short expiration for the test
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cache = TimedCache(datetime.timedelta(milliseconds=50))
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key, value = "test_key", "test_value"
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cache.set(key, value)
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# Value should be available immediately
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assert cache.get(key) == value
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# Wait for expiration
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time.sleep(0.06) # 60 milliseconds, slightly longer than expiration
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# Value should now be expired
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assert cache.get(key) is TimedCache.NOT_FOUND
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def test_overwrite_value(self):
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"""Test that setting a key that already exists overwrites the old value."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key = "test_key"
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# Set initial value
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cache.set(key, "initial_value")
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assert cache.get(key) == "initial_value"
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# Overwrite with new value
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cache.set(key, "new_value")
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assert cache.get(key) == "new_value"
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def test_extends_expiration_on_overwrite(self):
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"""Test that overwriting a key extends its expiration time."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key = "test_key"
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with patch("datetime.datetime") as mock_datetime:
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# Set initial value at t=0
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initial_time = datetime.datetime(2023, 1, 1, tzinfo=datetime.timezone.utc)
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mock_datetime.now.return_value = initial_time
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cache.set(key, "initial_value")
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initial_expiration = cache.cache[key][1]
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assert initial_expiration == initial_time + datetime.timedelta(seconds=10)
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# Overwrite at t=5
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later_time = initial_time + datetime.timedelta(seconds=5)
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mock_datetime.now.return_value = later_time
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cache.set(key, "new_value")
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# Expiration should be extended
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new_expiration = cache.cache[key][1]
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assert new_expiration == later_time + datetime.timedelta(seconds=10)
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def test_different_key_types(self):
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"""Test that different types of keys can be used."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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# Test various key types
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keys_and_values = [
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(42, "int_value"),
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(3.14, "float_value"),
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((1, 2), "tuple_value"),
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(frozenset({1, 2, 3}), "frozenset_value"),
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]
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for key, value in keys_and_values:
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cache.set(key, value)
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assert cache.get(key) == value
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def test_none_value(self):
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"""Test that None can be stored as a value."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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key = "none_key"
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cache.set(key, None)
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# The stored value is None, but get() should return None, not NOT_FOUND
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assert cache.get(key) is None
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def test_edge_case_zero_expiration(self):
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"""Test with a zero expiration time."""
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cache = TimedCache(datetime.timedelta(seconds=0))
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key, value = "test_key", "test_value"
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cache.set(key, value)
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# The value might already be expired by the time we call get()
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# We can't make strong assertions here due to timing variability
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retrieved = cache.get(key)
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assert retrieved in (value, TimedCache.NOT_FOUND)
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def test_negative_expiration(self):
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"""Test with a negative expiration time."""
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cache = TimedCache(datetime.timedelta(seconds=-1))
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key, value = "test_key", "test_value"
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cache.set(key, value)
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# Value should be immediately expired
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assert cache.get(key) is TimedCache.NOT_FOUND
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def test_cache_consistency(self):
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"""Test cache consistency with multiple operations."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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# Add multiple items
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cache.set("key1", "value1")
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cache.set("key2", "value2")
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cache.set("key3", "value3")
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# Check all items
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assert cache.get("key1") == "value1"
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assert cache.get("key2") == "value2"
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assert cache.get("key3") == "value3"
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# Overwrite one item
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cache.set("key2", "updated_value")
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# Check again
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assert cache.get("key1") == "value1"
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assert cache.get("key2") == "updated_value"
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assert cache.get("key3") == "value3"
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# Clear and verify all items are gone
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cache.clear()
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assert cache.get("key1") is TimedCache.NOT_FOUND
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assert cache.get("key2") is TimedCache.NOT_FOUND
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assert cache.get("key3") is TimedCache.NOT_FOUND
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def test_large_expiration(self):
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"""Test with a very large expiration time."""
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# One year expiration
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cache = TimedCache(datetime.timedelta(days=365))
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key, value = "test_key", "test_value"
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cache.set(key, value)
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assert cache.get(key) == value
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def test_many_items(self):
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"""Test cache with many items."""
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cache = TimedCache(datetime.timedelta(seconds=10))
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# Add 1000 items
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for i in range(1000):
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cache.set(f"key{i}", f"value{i}")
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# Check size
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assert len(cache.cache) == 1000
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# Check some random items
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for i in [0, 123, 456, 789, 999]:
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assert cache.get(f"key{i}") == f"value{i}"
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