chore(embeddings): added tests for embeddings (#3183)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

backend/api/tests/settings/test_settings.py

@@ -0,0 +1,38 @@
+from unittest.mock import patch, MagicMock
+from quivr_api.modules.dependencies import get_embedding_client
+from langchain_community.embeddings.ollama import OllamaEmbeddings
+from langchain_openai import AzureOpenAIEmbeddings
+
+def test_ollama_embedding():
+    with patch("quivr_api.modules.dependencies.settings") as mock_settings:
+        mock_settings.ollama_api_base_url = "http://ollama.example.com"
+        mock_settings.azure_openai_embeddings_url = None
+
+        embedding_client = get_embedding_client()
+
+        assert isinstance(embedding_client, OllamaEmbeddings)
+        assert embedding_client.base_url == "http://ollama.example.com"
+
+def test_azure_embedding():
+    with patch("quivr_api.modules.dependencies.settings") as mock_settings:
+        mock_settings.ollama_api_base_url = None
+        mock_settings.azure_openai_embeddings_url = "https://quivr-test.openai.azure.com/openai/deployments/embedding/embeddings?api-version=2023-05-15"
+
+        embedding_client = get_embedding_client()
+
+        assert isinstance(embedding_client, AzureOpenAIEmbeddings)
+        assert embedding_client.azure_endpoint == "https://quivr-test.openai.azure.com"
+
+def test_openai_embedding():
+    with patch("quivr_api.modules.dependencies.settings") as mock_settings, \
+         patch("quivr_api.modules.dependencies.OpenAIEmbeddings") as mock_openai_embeddings:
+        mock_settings.ollama_api_base_url = None
+        mock_settings.azure_openai_embeddings_url = None
+
+        # Create a mock instance for OpenAIEmbeddings
+        mock_openai_instance = MagicMock()
+        mock_openai_embeddings.return_value = mock_openai_instance
+
+        embedding_client = get_embedding_client()
+
+        assert embedding_client == mock_openai_instance