diff --git a/tests/test_invocation_cache_memory.py b/tests/test_invocation_cache_memory.py
new file mode 100644
index 0000000000..f776b86ee2
--- /dev/null
+++ b/tests/test_invocation_cache_memory.py
@@ -0,0 +1,183 @@
+# pyright: reportPrivateUsage=false
+from contextlib import suppress
+
+from invokeai.app.invocations.fields import ImageField
+from invokeai.app.invocations.primitives import ImageOutput
+from invokeai.app.services.invocation_cache.invocation_cache_memory import MemoryInvocationCache
+from tests.test_nodes import PromptTestInvocation
+
+
+def test_invocation_cache_memory_max_cache_size():
+    cache = MemoryInvocationCache()
+    assert cache._max_cache_size == 0
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    cache.save(1, output_1)
+    assert cache.get(1) is None
+    assert cache._hits == 0
+    assert cache._misses == 0  # TODO: when cache size is zero, should we consider it a miss?
+    assert len(cache._cache) == 0
+
+
+def test_invocation_cache_memory_creates_deterministic_keys():
+    hash1 = MemoryInvocationCache.create_key(PromptTestInvocation(prompt="foo"))
+    hash2 = MemoryInvocationCache.create_key(PromptTestInvocation(prompt="foo"))
+    hash3 = MemoryInvocationCache.create_key(PromptTestInvocation(prompt="bar"))
+
+    assert hash1 == hash2
+    assert hash1 != hash3
+
+
+def test_invocation_cache_memory_adds_invocation():
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+    cache = MemoryInvocationCache(max_cache_size=5)
+    cache.save(1, output_1)
+    cache.save(2, output_2)
+    assert cache.get(1) == output_1
+    assert cache.get(2) == output_2
+
+
+def test_invocation_cache_memory_tracks_hits():
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    cache = MemoryInvocationCache(max_cache_size=5)
+    cache.save(1, output_1)
+    cache.get(1)  # hit
+    cache.get(1)  # hit
+    cache.get(1)  # hit
+    cache.get(2)  # miss
+    cache.get(2)  # miss
+    assert cache._hits == 3
+    assert cache._misses == 2
+
+
+def test_invocation_cache_memory_is_lru():
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+    output_3 = ImageOutput(image=ImageField(image_name="baz"), width=512, height=512)
+    cache = MemoryInvocationCache(max_cache_size=2)
+    cache.save(1, output_1)
+    cache.save(2, output_2)
+    cache.save(3, output_3)
+    assert cache.get(1) is None
+    assert cache.get(2) == output_2
+    assert cache.get(3) == output_3
+    assert len(cache._cache) == 2
+    assert list(cache._cache.keys()) == [2, 3]
+    cache.get(2)
+    assert list(cache._cache.keys()) == [3, 2]
+
+
+def test_invocation_cache_memory_disables_and_enables():
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+    cache = MemoryInvocationCache(max_cache_size=2)
+    cache.save(1, output_1)
+    cache.disable()
+    assert cache.get(1) is None
+    cache.save(2, output_2)
+    assert cache.get(2) is None
+    assert len(cache._cache) == 1
+    assert cache._hits == 0
+    assert cache._misses == 0
+    cache.enable()
+    cache.save(2, output_2)
+    assert cache.get(2) is output_2
+    assert len(cache._cache) == 2
+    assert cache._hits == 1
+    assert cache._misses == 0
+
+
+def test_invocation_cache_memory_deletes_by_match():
+    # The _delete_by_match method attempts to log but the logger is not set up in the test environment
+    with suppress(AttributeError):
+        cache = MemoryInvocationCache(max_cache_size=5)
+        output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+        output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+        output_3 = ImageOutput(image=ImageField(image_name="baz"), width=512, height=512)
+        cache.save(1, output_1)
+        cache.save(2, output_2)
+        cache.save(3, output_3)
+        cache._delete_by_match("bar")
+        assert cache.get(1) == output_1
+        assert cache.get(2) is None
+        assert cache.get(3) == output_3
+        assert len(cache._cache) == 2
+        assert list(cache._cache.keys()) == [1, 3]
+        cache._delete_by_match("foo")
+        assert cache.get(1) is None
+        assert cache.get(2) is None
+        assert cache.get(3) == output_3
+        assert len(cache._cache) == 1
+        assert list(cache._cache.keys()) == [3]
+        cache._delete_by_match("baz")
+        assert cache.get(1) is None
+        assert cache.get(2) is None
+        assert cache.get(3) is None
+        assert len(cache._cache) == 0
+        assert list(cache._cache.keys()) == []
+        # shouldn't raise on empty cache
+        cache._delete_by_match("foo")
+
+
+def test_invocation_cache_memory_clears():
+    cache = MemoryInvocationCache(max_cache_size=5)
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+    output_3 = ImageOutput(image=ImageField(image_name="baz"), width=512, height=512)
+    cache.save(1, output_1)
+    cache.save(2, output_2)
+    cache.save(3, output_3)
+    cache.get(1)
+    cache.get(2)
+    cache.get(3)
+    cache.get("foo")  # miss
+    cache.get("bar")  # miss
+    cache.clear()
+    assert len(cache._cache) == 0
+    assert cache._hits == 0
+    assert cache._misses == 0
+    assert cache._misses == 0
+    assert cache.get(1) is None
+    assert cache.get(2) is None
+    assert cache.get(3) is None
+
+
+def test_invocation_cache_memory_status():
+    cache = MemoryInvocationCache(max_cache_size=5)
+    output_1 = ImageOutput(image=ImageField(image_name="foo"), width=512, height=512)
+    output_2 = ImageOutput(image=ImageField(image_name="bar"), width=512, height=512)
+    output_3 = ImageOutput(image=ImageField(image_name="baz"), width=512, height=512)
+    cache.save(1, output_1)
+    cache.save(2, output_2)
+    cache.save(3, output_3)
+    cache.get(1)
+    cache.get(2)
+    cache.get(3)
+    cache.get("foo")  # miss
+    cache.get("bar")  # miss
+    status = cache.get_status()
+    assert status.hits == 3
+    assert status.misses == 2
+    assert status.enabled
+    assert status.size == 3
+    assert status.max_size == 5
+    cache.disable()
+    status = cache.get_status()
+    assert not status.enabled
+    cache.enable()
+    status = cache.get_status()
+    assert status.enabled
+    cache.clear()
+    status = cache.get_status()
+    assert status.size == 0
+    assert status.hits == 0
+    assert status.misses == 0
+    assert status.enabled
+    assert status.max_size == 5
+    cache._max_cache_size = 0  # cache should be disabled when max_cache_size is zero
+    status = cache.get_status()
+    assert not status.enabled
+    assert status.size == 0
+    assert status.hits == 0
+    assert status.misses == 0
+    assert status.max_size == 0