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참고/neo4j-graphrag-python-main/tests/unit/embeddings/test_cohere_embedder.py

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+#  Copyright (c) "Neo4j"
+#  Neo4j Sweden AB [https://neo4j.com]
+#  #
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#  #
+#      https://www.apache.org/licenses/LICENSE-2.0
+#  #
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+from unittest.mock import MagicMock, Mock, patch
+
+import pytest
+from tenacity import RetryError
+from neo4j_graphrag.embeddings.cohere import CohereEmbeddings
+from neo4j_graphrag.exceptions import EmbeddingsGenerationError
+
+
+@patch("neo4j_graphrag.embeddings.cohere.cohere", None)
+def test_cohere_embedder_missing_cohere_dependency() -> None:
+    with pytest.raises(ImportError):
+        CohereEmbeddings()
+
+
+@patch("neo4j_graphrag.embeddings.cohere.cohere")
+def test_cohere_embedder_happy_path(mock_cohere: Mock) -> None:
+    mock_cohere.Client.return_value.embed.return_value = MagicMock(
+        embeddings=[[1.0, 2.0]]
+    )
+    embedder = CohereEmbeddings()
+    res = embedder.embed_query("my text")
+    assert res == [1.0, 2.0]
+
+
+@patch("neo4j_graphrag.embeddings.cohere.cohere")
+def test_cohere_embedder_non_retryable_error_handling(mock_cohere: Mock) -> None:
+    """Test that non-retryable errors fail immediately without retries."""
+    mock_embeddings = mock_cohere.Client.return_value.embed
+    mock_embeddings.side_effect = Exception("API Error")
+    embedder = CohereEmbeddings()
+    with pytest.raises(
+        EmbeddingsGenerationError, match="Failed to generate embedding with Cohere"
+    ):
+        embedder.embed_query("my text")
+
+    # Verify the API was called only once (no retries for non-rate-limit errors)
+    assert mock_embeddings.call_count == 1
+
+
+@patch("neo4j_graphrag.embeddings.cohere.cohere")
+def test_cohere_embedder_rate_limit_error_retries(mock_cohere: Mock) -> None:
+    """Test that rate limit errors are retried the expected number of times."""
+    # Rate limit error that should trigger retries (matches "too many requests" pattern)
+    # Create separate exception instances for each retry attempt
+    mock_embeddings = mock_cohere.Client.return_value.embed
+    mock_embeddings.side_effect = [
+        Exception("too many requests - please try again later"),
+        Exception("too many requests - please try again later"),
+        Exception("too many requests - please try again later"),
+    ]
+    embedder = CohereEmbeddings()
+
+    # After exhausting retries, tenacity raises RetryError
+    with pytest.raises(RetryError):
+        embedder.embed_query("my text")
+
+    # Verify the API was called 3 times (default max_attempts for RetryRateLimitHandler)
+    assert mock_cohere.Client.return_value.embed.call_count == 3
+
+
+@patch("neo4j_graphrag.embeddings.cohere.cohere")
+def test_cohere_embedder_rate_limit_error_eventual_success(mock_cohere: Mock) -> None:
+    """Test that rate limit errors eventually succeed after retries."""
+    # First two calls fail with rate limit, third succeeds
+    mock_embeddings = mock_cohere.Client.return_value.embed
+    mock_embeddings.side_effect = [
+        Exception("too many requests - please try again later"),
+        Exception("too many requests - please try again later"),
+        MagicMock(embeddings=[[1.0, 2.0]]),
+    ]
+    embedder = CohereEmbeddings()
+
+    result = embedder.embed_query("my text")
+
+    # Verify successful result
+    assert result == [1.0, 2.0]
+    # Verify the API was called 3 times before succeeding
+    assert mock_embeddings.call_count == 3