test(embeddings): add cache directory tests

This commit adds two tests for the cache_embeddings decorator in the
EmbeddingsCache class. The first test checks that the cache directory is
created when the cache is enabled. The second test checks that the cache
directory is not created when the cache is disabled. These tests help
ensure that the cache_embeddings decorator behaves as expected.

tests/test_cache_embeddings.py

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
 import tempfile
 import unittest
 from typing import List
@@ -177,3 +178,55 @@ async def test_cache_embeddings():
             texts,
             [[104.0, 101.0, 108.0, 108.0, 111.0], [119.0, 111.0, 114.0, 108.0, 100.0]],
         )
+
+
+class TestClass:
+    def __init__(self, cache_config):
+        self._cache_config = cache_config
+
+    @property
+    def cache_config(self):
+        return self._cache_config
+
+    @cache_embeddings
+    async def get_embeddings(self, texts):
+        return [[float(ord(c)) for c in text] for text in texts]
+
+
+@pytest.mark.asyncio
+async def test_cache_dir_created():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        cache_config = EmbeddingsCacheConfig(
+            enabled=True,
+            key_generator="md5",
+            store="filesystem",
+            store_config={"cache_dir": os.path.join(temp_dir, "exist")},
+        )
+
+        test_class = TestClass(cache_config)
+
+        await test_class.get_embeddings(["test"])
+
+        # Assert that the cache directory exists
+        assert os.path.exists(cache_config.store_config["cache_dir"])
+
+
+@pytest.mark.asyncio
+async def test_cache_dir_not_created():
+    with tempfile.TemporaryDirectory() as temp_dir:
+        cache_config = EmbeddingsCacheConfig(
+            enabled=False,
+            key_generator="md5",
+            store="filesystem",
+            store_config={"cache_dir": os.path.join(temp_dir, "exist")},
+        )
+
+        test_class = TestClass(cache_config)
+
+        test_class.cache_config.store_config["cache_dir"] = os.path.join(
+            temp_dir, "nonexistent"
+        )
+
+        await test_class.get_embeddings(["test"])
+
+        assert not os.path.exists(os.path.join(temp_dir, "nonexistent"))