feat: add mixedbread as a new model provider (#8523)

api/tests/integration_tests/model_runtime/mixedbread/test_provider.py

@@ -0,0 +1,28 @@
+import os
+from unittest.mock import Mock, patch
+
+import pytest
+
+from core.model_runtime.errors.validate import CredentialsValidateFailedError
+from core.model_runtime.model_providers.mixedbread.mixedbread import MixedBreadProvider
+
+
+def test_validate_provider_credentials():
+    provider = MixedBreadProvider()
+
+    with pytest.raises(CredentialsValidateFailedError):
+        provider.validate_provider_credentials(credentials={"api_key": "hahahaha"})
+    with patch("requests.post") as mock_post:
+        mock_response = Mock()
+        mock_response.json.return_value = {
+            "usage": {"prompt_tokens": 3, "total_tokens": 3},
+            "model": "mixedbread-ai/mxbai-embed-large-v1",
+            "data": [{"embedding": [0.23333 for _ in range(1024)], "index": 0, "object": "embedding"}],
+            "object": "list",
+            "normalized": "true",
+            "encoding_format": "float",
+            "dimensions": 1024,
+        }
+        mock_response.status_code = 200
+        mock_post.return_value = mock_response
+        provider.validate_provider_credentials(credentials={"api_key": os.environ.get("MIXEDBREAD_API_KEY")})