diff --git a/libs/community/langchain_community/chat_models/yandex.py b/libs/community/langchain_community/chat_models/yandex.py
index d6b3eb66dc8..02aed41650c 100644
--- a/libs/community/langchain_community/chat_models/yandex.py
+++ b/libs/community/langchain_community/chat_models/yandex.py
@@ -170,7 +170,7 @@ def _make_request(
         messages=[Message(**message) for message in message_history],
     )
     stub = TextGenerationServiceStub(channel)
-    res = stub.Completion(request, metadata=self._grpc_metadata)
+    res = stub.Completion(request, metadata=self.grpc_metadata)
     return list(res)[0].alternatives[0].message.text
 
 
@@ -229,7 +229,7 @@ async def _amake_request(self: ChatYandexGPT, messages: List[BaseMessage]) -> st
             messages=[Message(**message) for message in message_history],
         )
         stub = TextGenerationAsyncServiceStub(channel)
-        operation = await stub.Completion(request, metadata=self._grpc_metadata)
+        operation = await stub.Completion(request, metadata=self.grpc_metadata)
         async with grpc.aio.secure_channel(
             operation_api_url, channel_credentials
         ) as operation_channel:
@@ -239,7 +239,7 @@ async def _amake_request(self: ChatYandexGPT, messages: List[BaseMessage]) -> st
                 operation_request = GetOperationRequest(operation_id=operation.id)
                 operation = await operation_stub.Get(
                     operation_request,
-                    metadata=self._grpc_metadata,
+                    metadata=self.grpc_metadata,
                 )
 
         completion_response = CompletionResponse()
diff --git a/libs/community/langchain_community/embeddings/yandex.py b/libs/community/langchain_community/embeddings/yandex.py
index 7c662d49a06..dbddf245234 100644
--- a/libs/community/langchain_community/embeddings/yandex.py
+++ b/libs/community/langchain_community/embeddings/yandex.py
@@ -69,7 +69,7 @@ class YandexGPTEmbeddings(BaseModel, Embeddings):
     disable_request_logging: bool = False
     """YandexGPT API logs all request data by default. 
     If you provide personal data, confidential information, disable logging."""
-    _grpc_metadata: Sequence
+    grpc_metadata: Sequence
 
     class Config:
         allow_population_by_field_name = True
@@ -91,15 +91,15 @@ class YandexGPTEmbeddings(BaseModel, Embeddings):
         if api_key.get_secret_value() == "" and iam_token.get_secret_value() == "":
             raise ValueError("Either 'YC_API_KEY' or 'YC_IAM_TOKEN' must be provided.")
         if values["iam_token"]:
-            values["_grpc_metadata"] = [
+            values["grpc_metadata"] = [
                 ("authorization", f"Bearer {values['iam_token'].get_secret_value()}")
             ]
             if values["folder_id"]:
-                values["_grpc_metadata"].append(("x-folder-id", values["folder_id"]))
+                values["grpc_metadata"].append(("x-folder-id", values["folder_id"]))
         else:
-            values["_grpc_metadata"] = (
+            values["grpc_metadata"] = [
                 ("authorization", f"Api-Key {values['api_key'].get_secret_value()}"),
-            )
+            ]
 
         if not values.get("doc_model_uri"):
             if values["folder_id"] == "":
@@ -114,7 +114,7 @@ class YandexGPTEmbeddings(BaseModel, Embeddings):
                 f"emb://{values['folder_id']}/{values['model_name']}/{values['model_version']}"
             )
         if values["disable_request_logging"]:
-            values["_grpc_metadata"].append(
+            values["grpc_metadata"].append(
                 (
                     "x-data-logging-enabled",
                     "false",
@@ -206,7 +206,7 @@ def _make_request(self: YandexGPTEmbeddings, texts: List[str], **kwargs):  # typ
     for text in texts:
         request = TextEmbeddingRequest(model_uri=model_uri, text=text)
         stub = EmbeddingsServiceStub(channel)
-        res = stub.TextEmbedding(request, metadata=self._grpc_metadata)  # type: ignore[attr-defined]
+        res = stub.TextEmbedding(request, metadata=self.grpc_metadata)  # type: ignore[attr-defined]
         result.append(list(res.embedding))
         time.sleep(self.sleep_interval)
 
diff --git a/libs/community/langchain_community/llms/yandex.py b/libs/community/langchain_community/llms/yandex.py
index a29b0379441..b8761acd62b 100644
--- a/libs/community/langchain_community/llms/yandex.py
+++ b/libs/community/langchain_community/llms/yandex.py
@@ -57,7 +57,7 @@ class _BaseYandexGPT(Serializable):
     disable_request_logging: bool = False
     """YandexGPT API logs all request data by default. 
     If you provide personal data, confidential information, disable logging."""
-    _grpc_metadata: Optional[Sequence] = None
+    grpc_metadata: Optional[Sequence] = None
 
     @property
     def _llm_type(self) -> str:
@@ -92,15 +92,15 @@ class _BaseYandexGPT(Serializable):
             raise ValueError("Either 'YC_API_KEY' or 'YC_IAM_TOKEN' must be provided.")
 
         if values["iam_token"]:
-            values["_grpc_metadata"] = [
+            values["grpc_metadata"] = [
                 ("authorization", f"Bearer {values['iam_token'].get_secret_value()}")
             ]
             if values["folder_id"]:
-                values["_grpc_metadata"].append(("x-folder-id", values["folder_id"]))
+                values["grpc_metadata"].append(("x-folder-id", values["folder_id"]))
         else:
-            values["_grpc_metadata"] = (
+            values["grpc_metadata"] = [
                 ("authorization", f"Api-Key {values['api_key'].get_secret_value()}"),
-            )
+            ]
         if values["model_uri"] == "" and values["folder_id"] == "":
             raise ValueError("Either 'model_uri' or 'folder_id' must be provided.")
         if not values["model_uri"]:
@@ -108,7 +108,7 @@ class _BaseYandexGPT(Serializable):
                 f"gpt://{values['folder_id']}/{values['model_name']}/{values['model_version']}"
             )
         if values["disable_request_logging"]:
-            values["_grpc_metadata"].append(
+            values["grpc_metadata"].append(
                 (
                     "x-data-logging-enabled",
                     "false",
@@ -235,7 +235,7 @@ def _make_request(
         messages=[Message(role="user", text=prompt)],
     )
     stub = TextGenerationServiceStub(channel)
-    res = stub.Completion(request, metadata=self._grpc_metadata)  # type: ignore[attr-defined]
+    res = stub.Completion(request, metadata=self.grpc_metadata)  # type: ignore[attr-defined]
     return list(res)[0].alternatives[0].message.text
 
 
@@ -291,7 +291,7 @@ async def _amake_request(self: YandexGPT, prompt: str) -> str:
             messages=[Message(role="user", text=prompt)],
         )
         stub = TextGenerationAsyncServiceStub(channel)
-        operation = await stub.Completion(request, metadata=self._grpc_metadata)  # type: ignore[attr-defined]
+        operation = await stub.Completion(request, metadata=self.grpc_metadata)  # type: ignore[attr-defined]
         async with grpc.aio.secure_channel(
             operation_api_url, channel_credentials
         ) as operation_channel:
@@ -301,7 +301,7 @@ async def _amake_request(self: YandexGPT, prompt: str) -> str:
                 operation_request = GetOperationRequest(operation_id=operation.id)
                 operation = await operation_stub.Get(
                     operation_request,
-                    metadata=self._grpc_metadata,  # type: ignore[attr-defined]
+                    metadata=self.grpc_metadata,  # type: ignore[attr-defined]
                 )
 
         completion_response = CompletionResponse()
diff --git a/libs/community/tests/integration_tests/embeddings/test_yandex.py b/libs/community/tests/integration_tests/embeddings/test_yandex.py
new file mode 100644
index 00000000000..ff7f5e36bf6
--- /dev/null
+++ b/libs/community/tests/integration_tests/embeddings/test_yandex.py
@@ -0,0 +1,31 @@
+import pytest
+
+from langchain_community.embeddings.yandex import YandexGPTEmbeddings
+
+
+@pytest.mark.parametrize(
+    "constructor_args",
+    [
+        dict(),
+        dict(disable_request_logging=True),
+    ],
+)
+# @pytest.mark.scheduled - idk what it means
+# requires YC_* env and active service
+def test_yandex_embedding(constructor_args: dict) -> None:
+    documents = ["exactly same", "exactly same", "different"]
+    embedding = YandexGPTEmbeddings(**constructor_args)
+    doc_outputs = embedding.embed_documents(documents)
+    assert len(doc_outputs) == 3
+    for i in range(3):
+        assert len(doc_outputs[i]) >= 256  # there are many dims
+        assert len(doc_outputs[0]) == len(doc_outputs[i])  # dims are te same
+    assert doc_outputs[0] == doc_outputs[1]  # same input, same embeddings
+    assert doc_outputs[2] != doc_outputs[1]  # different input, different embeddings
+
+    qry_output = embedding.embed_query(documents[0])
+    assert len(qry_output) >= 256
+    assert len(doc_outputs[0]) == len(
+        qry_output
+    )  # query and doc models have same dimensions
+    assert doc_outputs[0] != qry_output  # query and doc models are different
diff --git a/libs/community/tests/unit_tests/chat_models/test_yandex.py b/libs/community/tests/unit_tests/chat_models/test_yandex.py
new file mode 100644
index 00000000000..0dd741909ed
--- /dev/null
+++ b/libs/community/tests/unit_tests/chat_models/test_yandex.py
@@ -0,0 +1,92 @@
+import os
+from unittest import mock
+from unittest.mock import MagicMock
+
+import pytest
+
+from langchain_community.chat_models.yandex import ChatYandexGPT
+
+
+def test_yandexgpt_initialization() -> None:
+    llm = ChatYandexGPT(
+        iam_token="your_iam_token",  # type: ignore[arg-type]
+        api_key="your_api_key",  # type: ignore[arg-type]
+        folder_id="your_folder_id",
+    )
+    assert llm.model_name == "yandexgpt-lite"
+    assert llm.model_uri.startswith("gpt://your_folder_id/yandexgpt-lite/")
+
+
+def test_yandexgpt_model_params() -> None:
+    llm = ChatYandexGPT(
+        model_name="custom-model",
+        model_version="v1",
+        iam_token="your_iam_token",  # type: ignore[arg-type]
+        api_key="your_api_key",  # type: ignore[arg-type]
+        folder_id="your_folder_id",
+    )
+    assert llm.model_name == "custom-model"
+    assert llm.model_version == "v1"
+    assert llm.iam_token.get_secret_value() == "your_iam_token"
+    assert llm.model_uri == "gpt://your_folder_id/custom-model/v1"
+
+
+def test_yandexgpt_invalid_model_params() -> None:
+    with pytest.raises(ValueError):
+        ChatYandexGPT(model_uri="", iam_token="your_iam_token")  # type: ignore[arg-type]
+    with pytest.raises(ValueError):
+        ChatYandexGPT(
+            iam_token="",  # type: ignore[arg-type]
+            api_key="your_api_key",  # type: ignore[arg-type]
+            model_uri="",
+        )
+
+
+@pytest.mark.parametrize(
+    "api_key_or_token", [dict(api_key="bogus"), dict(iam_token="bogus")]
+)
+@pytest.mark.parametrize(
+    "disable_logging",
+    [dict(), dict(disable_request_logging=True), dict(disable_request_logging=False)],
+)
+@mock.patch.dict(os.environ, {}, clear=True)
+def test_completion_call(api_key_or_token: dict, disable_logging: dict) -> None:
+    absent_yandex_module_stub = MagicMock()
+    grpc_mock = MagicMock()
+    with mock.patch.dict(
+        "sys.modules",
+        {
+            "yandex.cloud.ai.foundation_models.v1."
+            "text_common_pb2": absent_yandex_module_stub,
+            "yandex.cloud.ai.foundation_models.v1.text_generation."
+            "text_generation_service_pb2": absent_yandex_module_stub,
+            "yandex.cloud.ai.foundation_models.v1.text_generation."
+            "text_generation_service_pb2_grpc": absent_yandex_module_stub,
+            "grpc": grpc_mock,
+        },
+    ):
+        grpc_mock.RpcError = Exception
+        stub = absent_yandex_module_stub.TextGenerationServiceStub
+        request_stub = absent_yandex_module_stub.CompletionRequest
+        msg_constructor_stub = absent_yandex_module_stub.Message
+        args = {"folder_id": "fldr", **api_key_or_token, **disable_logging}
+        ygpt = ChatYandexGPT(**args)
+        grpc_call_mock = stub.return_value.Completion
+        msg_mock = mock.Mock()
+        msg_mock.message.text = "cmpltn"
+        res_mock = mock.Mock()
+        res_mock.alternatives = [msg_mock]
+        grpc_call_mock.return_value = [res_mock]
+        act_emb = ygpt.invoke("nomatter")
+        assert act_emb.content == "cmpltn"
+        assert len(grpc_call_mock.call_args_list) == 1
+        once_called_args = grpc_call_mock.call_args_list[0]
+        act_model_uri = request_stub.call_args_list[0].kwargs["model_uri"]
+        act_text = msg_constructor_stub.call_args_list[0].kwargs["text"]
+        act_metadata = once_called_args.kwargs["metadata"]
+        assert "fldr" in act_model_uri
+        assert act_text == "nomatter"
+        assert act_metadata
+        assert len(act_metadata) > 0
+        if disable_logging.get("disable_request_logging"):
+            assert ("x-data-logging-enabled", "false") in act_metadata
diff --git a/libs/community/tests/unit_tests/embeddings/test_yandex.py b/libs/community/tests/unit_tests/embeddings/test_yandex.py
index c681af05a28..76ab574f721 100644
--- a/libs/community/tests/unit_tests/embeddings/test_yandex.py
+++ b/libs/community/tests/unit_tests/embeddings/test_yandex.py
@@ -1,10 +1,21 @@
 import os
+from unittest import mock
+from unittest.mock import MagicMock
+
+import pytest
 
 from langchain_community.embeddings import YandexGPTEmbeddings
 
+YANDEX_MODULE_NAME2 = (
+    "yandex.cloud.ai.foundation_models.v1.embedding.embedding_service_pb2_grpc"
+)
+YANDEX_MODULE_NAME = (
+    "yandex.cloud.ai.foundation_models.v1.embedding.embedding_service_pb2"
+)
 
+
+@mock.patch.dict(os.environ, {"YC_API_KEY": "foo"}, clear=True)
 def test_init() -> None:
-    os.environ["YC_API_KEY"] = "foo"
     models = [
         YandexGPTEmbeddings(folder_id="bar"),  # type: ignore[call-arg]
         YandexGPTEmbeddings(  # type: ignore[call-arg]
@@ -22,3 +33,92 @@ def test_init() -> None:
         assert embeddings.doc_model_uri == "emb://bar/text-search-doc/latest"
         assert embeddings.model_name == "text-search-query"
         assert embeddings.doc_model_name == "text-search-doc"
+
+
+@pytest.mark.parametrize(
+    "api_key_or_token", [dict(api_key="bogus"), dict(iam_token="bogus")]
+)
+@pytest.mark.parametrize(
+    "disable_logging",
+    [dict(), dict(disable_request_logging=True), dict(disable_request_logging=False)],
+)
+@mock.patch.dict(os.environ, {}, clear=True)
+def test_query_embedding_call(api_key_or_token: dict, disable_logging: dict) -> None:
+    absent_yandex_module_stub = MagicMock()
+    with mock.patch.dict(
+        "sys.modules",
+        {
+            YANDEX_MODULE_NAME: absent_yandex_module_stub,
+            YANDEX_MODULE_NAME2: absent_yandex_module_stub,
+            "grpc": MagicMock(),
+        },
+    ):
+        stub = absent_yandex_module_stub.EmbeddingsServiceStub
+        request_stub = absent_yandex_module_stub.TextEmbeddingRequest
+        args = {"folder_id": "fldr", **api_key_or_token, **disable_logging}
+        ygpt = YandexGPTEmbeddings(**args)
+        grpc_call_mock = stub.return_value.TextEmbedding
+        grpc_call_mock.return_value.embedding = [1, 2, 3]
+        act_emb = ygpt.embed_query("nomatter")
+        assert act_emb == [1, 2, 3]
+        assert len(grpc_call_mock.call_args_list) == 1
+        once_called_args = grpc_call_mock.call_args_list[0]
+        act_model_uri = request_stub.call_args_list[0].kwargs["model_uri"]
+        assert "fldr" in act_model_uri
+        assert "query" in act_model_uri
+        assert "doc" not in act_model_uri
+        act_text = request_stub.call_args_list[0].kwargs["text"]
+        assert act_text == "nomatter"
+        act_metadata = once_called_args.kwargs["metadata"]
+        assert act_metadata
+        assert len(act_metadata) > 0
+        if disable_logging.get("disable_request_logging"):
+            assert ("x-data-logging-enabled", "false") in act_metadata
+
+
+@pytest.mark.parametrize(
+    "api_key_or_token", [dict(api_key="bogus"), dict(iam_token="bogus")]
+)
+@pytest.mark.parametrize(
+    "disable_logging",
+    [dict(), dict(disable_request_logging=True), dict(disable_request_logging=False)],
+)
+@mock.patch.dict(os.environ, {}, clear=True)
+def test_doc_embedding_call(api_key_or_token: dict, disable_logging: dict) -> None:
+    absent_yandex_module_stub = MagicMock()
+    with mock.patch.dict(
+        "sys.modules",
+        {
+            YANDEX_MODULE_NAME: absent_yandex_module_stub,
+            YANDEX_MODULE_NAME2: absent_yandex_module_stub,
+            "grpc": MagicMock(),
+        },
+    ):
+        stub = absent_yandex_module_stub.EmbeddingsServiceStub
+        request_stub = absent_yandex_module_stub.TextEmbeddingRequest
+        args = {"folder_id": "fldr", **api_key_or_token, **disable_logging}
+        ygpt = YandexGPTEmbeddings(**args)
+        grpc_call_mock = stub.return_value.TextEmbedding
+        foo_emb = mock.Mock()
+        foo_emb.embedding = [1, 2, 3]
+        bar_emb = mock.Mock()
+        bar_emb.embedding = [4, 5, 6]
+        grpc_call_mock.side_effect = [foo_emb, bar_emb]
+        act_emb = ygpt.embed_documents(["foo", "bar"])
+        assert act_emb == [[1, 2, 3], [4, 5, 6]]
+        assert len(grpc_call_mock.call_args_list) == 2
+        for i, txt in enumerate(["foo", "bar"]):
+            act_model_uri = request_stub.call_args_list[i].kwargs["model_uri"]
+            act_text = request_stub.call_args_list[i].kwargs["text"]
+            call_args = grpc_call_mock.call_args_list[i]
+            act_metadata = call_args.kwargs["metadata"]
+            assert "fldr" in act_model_uri
+            assert "query" not in act_model_uri
+            assert "doc" in act_model_uri
+            assert act_text == txt
+            assert act_metadata
+            assert len(act_metadata) > 0
+            if disable_logging.get("disable_request_logging"):
+                assert ("x-data-logging-enabled", "false") in call_args.kwargs[
+                    "metadata"
+                ]
diff --git a/libs/community/tests/unit_tests/llms/test_yandex.py b/libs/community/tests/unit_tests/llms/test_yandex.py
index aadbc6ad845..a694b2ab98a 100644
--- a/libs/community/tests/unit_tests/llms/test_yandex.py
+++ b/libs/community/tests/unit_tests/llms/test_yandex.py
@@ -1,3 +1,7 @@
+import os
+from unittest import mock
+from unittest.mock import MagicMock
+
 import pytest
 
 from langchain_community.llms.yandex import YandexGPT
@@ -36,3 +40,53 @@ def test_yandexgpt_invalid_model_params() -> None:
             api_key="your_api_key",  # type: ignore[arg-type]
             model_uri="",
         )
+
+
+@pytest.mark.parametrize(
+    "api_key_or_token", [dict(api_key="bogus"), dict(iam_token="bogus")]
+)
+@pytest.mark.parametrize(
+    "disable_logging",
+    [dict(), dict(disable_request_logging=True), dict(disable_request_logging=False)],
+)
+@mock.patch.dict(os.environ, {}, clear=True)
+def test_completion_call(api_key_or_token: dict, disable_logging: dict) -> None:
+    absent_yandex_module_stub = MagicMock()
+    grpc_mock = MagicMock()
+    with mock.patch.dict(
+        "sys.modules",
+        {
+            "yandex.cloud.ai.foundation_models.v1."
+            "text_common_pb2": absent_yandex_module_stub,
+            "yandex.cloud.ai.foundation_models.v1.text_generation."
+            "text_generation_service_pb2": absent_yandex_module_stub,
+            "yandex.cloud.ai.foundation_models.v1.text_generation."
+            "text_generation_service_pb2_grpc": absent_yandex_module_stub,
+            "grpc": grpc_mock,
+        },
+    ):
+        grpc_mock.RpcError = Exception
+        stub = absent_yandex_module_stub.TextGenerationServiceStub
+        request_stub = absent_yandex_module_stub.CompletionRequest
+        msg_constructor_stub = absent_yandex_module_stub.Message
+        args = {"folder_id": "fldr", **api_key_or_token, **disable_logging}
+        ygpt = YandexGPT(**args)
+        grpc_call_mock = stub.return_value.Completion
+        msg_mock = mock.Mock()
+        msg_mock.message.text = "cmpltn"
+        res_mock = mock.Mock()
+        res_mock.alternatives = [msg_mock]
+        grpc_call_mock.return_value = [res_mock]
+        act_emb = ygpt.invoke("nomatter")
+        assert act_emb == "cmpltn"
+        assert len(grpc_call_mock.call_args_list) == 1
+        once_called_args = grpc_call_mock.call_args_list[0]
+        act_model_uri = request_stub.call_args_list[0].kwargs["model_uri"]
+        act_text = msg_constructor_stub.call_args_list[0].kwargs["text"]
+        act_metadata = once_called_args.kwargs["metadata"]
+        assert "fldr" in act_model_uri
+        assert act_text == "nomatter"
+        assert act_metadata
+        assert len(act_metadata) > 0
+        if disable_logging.get("disable_request_logging"):
+            assert ("x-data-logging-enabled", "false") in act_metadata