diff --git a/mindinsight/debugger/common/exceptions/exceptions.py b/mindinsight/debugger/common/exceptions/exceptions.py
index 3efbcf64..52ba5805 100644
--- a/mindinsight/debugger/common/exceptions/exceptions.py
+++ b/mindinsight/debugger/common/exceptions/exceptions.py
@@ -78,7 +78,8 @@ class DebuggerCompareTensorError(MindInsightException):
     def __init__(self, msg):
         super(DebuggerCompareTensorError, self).__init__(
             error=DebuggerErrors.COMPARE_TENSOR_ERROR,
-            message=DebuggerErrorMsg.COMPARE_TENSOR_ERROR.value.format(msg)
+            message=msg,
+            http_code=400
         )
 
 
@@ -111,7 +112,8 @@ class DebuggerNodeNotInGraphError(MindInsightException):
             err_msg = f"Cannot find the node in graph by the given name. node name: {node_name}."
         super(DebuggerNodeNotInGraphError, self).__init__(
             error=DebuggerErrors.NODE_NOT_IN_GRAPH_ERROR,
-            message=err_msg
+            message=err_msg,
+            http_code=400
         )
 
 
@@ -120,5 +122,6 @@ class DebuggerGraphNotExistError(MindInsightException):
     def __init__(self):
         super(DebuggerGraphNotExistError, self).__init__(
             error=DebuggerErrors.GRAPH_NOT_EXIST_ERROR,
-            message=DebuggerErrorMsg.GRAPH_NOT_EXIST_ERROR.value
+            message=DebuggerErrorMsg.GRAPH_NOT_EXIST_ERROR.value,
+            http_code=400
         )
diff --git a/mindinsight/debugger/debugger_server.py b/mindinsight/debugger/debugger_server.py
index 2fae23d3..f7182e57 100644
--- a/mindinsight/debugger/debugger_server.py
+++ b/mindinsight/debugger/debugger_server.py
@@ -24,7 +24,8 @@ from mindinsight.datavisual.data_transform.graph import NodeTypeEnum
 from mindinsight.datavisual.utils.tools import to_float
 from mindinsight.debugger.common.exceptions.exceptions import DebuggerParamValueError, \
     DebuggerParamTypeError, DebuggerCreateWatchPointError, DebuggerUpdateWatchPointError, \
-    DebuggerDeleteWatchPointError, DebuggerContinueError, DebuggerPauseError, DebuggerCompareTensorError
+    DebuggerDeleteWatchPointError, DebuggerContinueError, DebuggerPauseError, \
+    DebuggerCompareTensorError
 from mindinsight.debugger.common.log import logger as log
 from mindinsight.debugger.common.utils import get_ack_reply, ServerStatus, \
     create_view_event_from_tensor_history, Streams, is_scope_type, NodeBasicInfo
@@ -146,13 +147,10 @@ class DebuggerServer:
         node_type, tensor_name = self._get_tensor_name_and_type_by_ui_name(name)
         tolerance = to_float(tolerance, 'tolerance')
         tensor_stream = self.cache_store.get_stream_handler(Streams.TENSOR)
-        if detail == 'data':
-            if node_type == NodeTypeEnum.PARAMETER.value:
-                reply = tensor_stream.get_tensors_diff(tensor_name, parsed_shape, tolerance)
-            else:
-                raise DebuggerParamValueError("The node type must be parameter, but got {}.".format(node_type))
+        if node_type == NodeTypeEnum.PARAMETER.value:
+            reply = tensor_stream.get_tensors_diff(tensor_name, parsed_shape, tolerance)
         else:
-            raise DebuggerParamValueError("The value of detail: {} is not support.".format(detail))
+            raise DebuggerParamValueError("The node type must be parameter, but got {}.".format(node_type))
         return reply
 
     def retrieve(self, mode, filter_condition=None):
@@ -177,8 +175,8 @@ class DebuggerServer:
         # validate param <mode>
         if mode not in mode_mapping.keys():
             log.error("Invalid param <mode>. <mode> should be in ['all', 'node', 'watchpoint', "
-                      "'watchpoint_hit', 'tensor'], but got %s.", mode_mapping)
-            raise DebuggerParamTypeError("Invalid mode.")
+                      "'watchpoint_hit'], but got %s.", mode_mapping)
+            raise DebuggerParamValueError("Invalid mode.")
         # validate backend status
         metadata_stream = self.cache_store.get_stream_handler(Streams.METADATA)
         if metadata_stream.state == ServerStatus.PENDING.value:
diff --git a/tests/ut/debugger/__init__.py b/tests/ut/debugger/__init__.py
index 95a33e57..c6e0e62c 100644
--- a/tests/ut/debugger/__init__.py
+++ b/tests/ut/debugger/__init__.py
@@ -12,4 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-"""Test for debugger module."""
+"""
+Function:
+    Unit test for debugger module.
+Usage:
+    pytest tests/ut/debugger/
+"""
diff --git a/tests/ut/debugger/configurations.py b/tests/ut/debugger/configurations.py
index fd5ac870..c0426679 100644
--- a/tests/ut/debugger/configurations.py
+++ b/tests/ut/debugger/configurations.py
@@ -23,10 +23,12 @@ from mindinsight.debugger.common.utils import NodeBasicInfo
 from mindinsight.debugger.proto import ms_graph_pb2
 from mindinsight.debugger.stream_handler.graph_handler import GraphHandler
 from mindinsight.debugger.stream_handler.watchpoint_handler import WatchpointHitHandler
+from tests.utils.tools import compare_result_with_file
 
 GRAPH_PROTO_FILE = os.path.join(
     os.path.dirname(__file__), '../../utils/resource/graph_pb/lenet.pb'
 )
+DEBUGGER_EXPECTED_RESULTS = os.path.join(os.path.dirname(__file__), 'expected_results')
 
 
 def get_graph_proto():
@@ -137,3 +139,15 @@ def mock_tensor_history():
     }
 
     return tensor_history
+
+
+def compare_debugger_result_with_file(res, expect_file):
+    """
+    Compare debugger result with file.
+
+    Args:
+        res (dict): The debugger result in dict type.
+        expect_file: The expected file name.
+    """
+    real_path = os.path.join(DEBUGGER_EXPECTED_RESULTS, expect_file)
+    compare_result_with_file(res, real_path)
diff --git a/tests/ut/debugger/expected_results/debugger_server/retrieve_all.json b/tests/ut/debugger/expected_results/debugger_server/retrieve_all.json
new file mode 100644
index 00000000..81cad5eb
--- /dev/null
+++ b/tests/ut/debugger/expected_results/debugger_server/retrieve_all.json
@@ -0,0 +1 @@
+{"metadata": {"state": "waiting", "step": 0, "device_name": "", "pos": "0", "ip": "", "node_name": "", "backend": ""}, "graph": {}, "watch_points": []}
\ No newline at end of file
diff --git a/tests/ut/debugger/expected_results/debugger_server/retrieve_tensor_history.json b/tests/ut/debugger/expected_results/debugger_server/retrieve_tensor_history.json
new file mode 100644
index 00000000..1beb6696
--- /dev/null
+++ b/tests/ut/debugger/expected_results/debugger_server/retrieve_tensor_history.json
@@ -0,0 +1 @@
+{"tensor_history": [{"name": "Default/TransData-op99:0", "full_name": "Default/TransData-op99:0", "node_type": "TransData", "type": "output", "step": 0, "dtype": "DT_FLOAT32", "shape": [2, 3], "has_prev_step": false, "value": "click to view"}, {"name": "Default/args0:0", "full_name": "Default/args0:0", "node_type": "Parameter", "type": "input", "step": 0, "dtype": "DT_FLOAT32", "shape": [2, 3], "has_prev_step": false, "value": "click to view"}], "metadata": {"state": "waiting", "step": 0, "device_name": "", "pos": "0", "ip": "", "node_name": "", "backend": ""}}
\ No newline at end of file
diff --git a/tests/ut/debugger/stream_handler/test_watchpoint_handler.py b/tests/ut/debugger/stream_handler/test_watchpoint_handler.py
index 67e1f6ec..27d7e737 100644
--- a/tests/ut/debugger/stream_handler/test_watchpoint_handler.py
+++ b/tests/ut/debugger/stream_handler/test_watchpoint_handler.py
@@ -12,7 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-"""Test WatchpointHandler."""
+"""
+Function:
+    Test query debugger watchpoint handler.
+Usage:
+    pytest tests/ut/debugger
+"""
 import json
 import os
 from unittest import mock, TestCase
diff --git a/tests/ut/debugger/test_debugger_grpc_server.py b/tests/ut/debugger/test_debugger_grpc_server.py
new file mode 100644
index 00000000..bd20fff7
--- /dev/null
+++ b/tests/ut/debugger/test_debugger_grpc_server.py
@@ -0,0 +1,237 @@
+# Copyright 2020 Huawei Technologies Co., Ltd
+#
+# 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
+#
+# http://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.
+# ============================================================================
+"""
+Function:
+    Test debugger grpc server.
+Usage:
+    pytest tests/ut/debugger/test_debugger_grpc_server.py
+"""
+from unittest import mock
+from unittest.mock import MagicMock
+
+import numpy as np
+
+from mindinsight.debugger.common.utils import get_ack_reply, ServerStatus
+from mindinsight.debugger.debugger_cache import DebuggerCache
+from mindinsight.debugger.debugger_grpc_server import DebuggerGrpcServer
+from mindinsight.debugger.proto.debug_grpc_pb2 import EventReply, SetCMD, Chunk, WatchpointHit
+from mindinsight.debugger.proto.ms_graph_pb2 import TensorProto, DataType
+from mindinsight.debugger.stream_handler import WatchpointHitHandler, GraphHandler, \
+    WatchpointHandler
+from tests.ut.debugger.configurations import GRAPH_PROTO_FILE
+
+
+class MockDataGenerator:
+    """Mocked Data generator."""
+
+    @staticmethod
+    def get_run_cmd(steps=0, level='step', node_name=''):
+        """Get run command."""
+        event = get_ack_reply()
+        event.run_cmd.run_level = level
+        if level == 'node':
+            event.run_cmd.node_name = node_name
+        else:
+            event.run_cmd.run_steps = steps
+        return event
+
+    @staticmethod
+    def get_exit_cmd():
+        """Get exit command."""
+        event = get_ack_reply()
+        event.exit = True
+        return event
+
+    @staticmethod
+    def get_set_cmd():
+        """Get set command"""
+        event = get_ack_reply()
+        event.set_cmd.CopyFrom(SetCMD(id=1, watch_condition=1))
+        return event
+
+    @staticmethod
+    def get_view_cmd():
+        """Get set command"""
+        view_event = get_ack_reply()
+        ms_tensor = view_event.view_cmd.tensors.add()
+        ms_tensor.node_name, ms_tensor.slot = 'mock_node_name', '0'
+        event = {'view_cmd': view_event, 'node_name': 'mock_node_name'}
+        return event
+
+    @staticmethod
+    def get_graph_chunks():
+        """Get graph chunks."""
+        chunk_size = 1024
+        with open(GRAPH_PROTO_FILE, 'rb') as file_handler:
+            content = file_handler.read()
+        chunks = [Chunk(buffer=content[0:chunk_size]), Chunk(buffer=content[chunk_size:])]
+        return chunks
+
+    @staticmethod
+    def get_tensors():
+        """Get tensors."""
+        tensor_content = np.asarray([1, 2, 3, 4, 5, 6]).astype(np.float32).tobytes()
+        tensor_pre = TensorProto(
+            node_name='mock_node_name',
+            slot='0',
+            data_type=DataType.DT_FLOAT32,
+            dims=[2, 3],
+            tensor_content=tensor_content[:12],
+            finished=0
+        )
+        tensor_succ = TensorProto()
+        tensor_succ.CopyFrom(tensor_pre)
+        tensor_succ.tensor_content = tensor_content[12:]
+        tensor_succ.finished = 1
+        return [tensor_pre, tensor_succ]
+
+    @staticmethod
+    def get_watchpoint_hit():
+        """Get watchpoint hit."""
+        res = WatchpointHit(id=1)
+        res.tensor.node_name = 'mock_node_name'
+        res.tensor.slot = '0'
+        return res
+
+
+class TestDebuggerGrpcServer:
+    """Test debugger grpc server."""
+
+    @classmethod
+    def setup_class(cls):
+        """Initialize for test class."""
+        cls._server = None
+
+    def setup_method(self):
+        """Initialize for each testcase."""
+        cache_store = DebuggerCache()
+        self._server = DebuggerGrpcServer(cache_store)
+
+    def test_waitcmd_with_pending_status(self):
+        """Test wait command interface when status is pending."""
+        res = self._server.WaitCMD(MagicMock(), MagicMock())
+        assert res.status == EventReply.Status.FAILED
+
+    @mock.patch.object(WatchpointHitHandler, 'empty', False)
+    @mock.patch.object(DebuggerGrpcServer, '_deal_with_old_command')
+    def test_waitcmd_with_old_command(self, *args):
+        """Test wait command interface with old command."""
+        old_command = MockDataGenerator.get_run_cmd(steps=1)
+        args[0].return_value = old_command
+        setattr(self._server, '_status', ServerStatus.WAITING)
+        setattr(self._server, '_received_view_cmd', {'node_name': 'mock_node_name'})
+        setattr(self._server, '_received_hit', True)
+        res = self._server.WaitCMD(MagicMock(cur_step=1), MagicMock())
+        assert res == old_command
+
+    @mock.patch.object(DebuggerGrpcServer, '_deal_with_old_command', return_value=None)
+    @mock.patch.object(DebuggerGrpcServer, '_wait_for_next_command')
+    def test_waitcmd_with_next_command(self, *args):
+        """Test wait for next command."""
+        old_command = MockDataGenerator.get_run_cmd(steps=1)
+        args[0].return_value = old_command
+        setattr(self._server, '_status', ServerStatus.WAITING)
+        res = self._server.WaitCMD(MagicMock(cur_step=1), MagicMock())
+        assert res == old_command
+
+    @mock.patch.object(DebuggerGrpcServer, '_deal_with_old_command', return_value=None)
+    @mock.patch.object(DebuggerGrpcServer, '_wait_for_next_command')
+    def test_waitcmd_with_next_command_is_none(self, *args):
+        """Test wait command interface with next command is None."""
+        args[0].return_value = None
+        setattr(self._server, '_status', ServerStatus.RECEIVE_GRAPH)
+        res = self._server.WaitCMD(MagicMock(cur_step=1), MagicMock())
+        assert res == get_ack_reply(1)
+
+    @mock.patch.object(DebuggerCache, 'get_command', return_value=(0, None))
+    @mock.patch.object(DebuggerCache, 'has_command')
+    def test_deal_with_old_command_with_continue_steps(self, *args):
+        """Test deal with old command with continue steps."""
+        args[0].side_effect = [True, False]
+        setattr(self._server, '_continue_steps', 1)
+        res = self._server._deal_with_old_command()
+        assert res == MockDataGenerator.get_run_cmd(steps=1)
+
+    @mock.patch.object(DebuggerCache, 'get_command')
+    @mock.patch.object(DebuggerCache, 'has_command', return_value=True)
+    def test_deal_with_old_command_with_exit_cmd(self, *args):
+        """Test deal with exit command."""
+        cmd = MockDataGenerator.get_exit_cmd()
+        args[1].return_value = ('0', cmd)
+        res = self._server._deal_with_old_command()
+        assert res == cmd
+
+    @mock.patch.object(DebuggerCache, 'get_command')
+    @mock.patch.object(DebuggerCache, 'has_command', return_value=True)
+    def test_deal_with_old_command_with_view_cmd(self, *args):
+        """Test deal with view command."""
+        cmd = MockDataGenerator.get_view_cmd()
+        args[1].return_value = ('0', cmd)
+        res = self._server._deal_with_old_command()
+        assert res == cmd.get('view_cmd')
+        expect_received_view_cmd = {'node_name': cmd.get('node_name'), 'wait_for_tensor': True}
+        assert getattr(self._server, '_received_view_cmd') == expect_received_view_cmd
+
+    @mock.patch.object(DebuggerCache, 'get_command')
+    def test_wait_for_run_command(self, *args):
+        """Test wait for run command."""
+        cmd = MockDataGenerator.get_run_cmd(steps=2)
+        args[0].return_value = ('0', cmd)
+        setattr(self._server, '_status', ServerStatus.WAITING)
+        res = self._server._wait_for_next_command()
+        assert res == MockDataGenerator.get_run_cmd(steps=1)
+        assert getattr(self._server, '_continue_steps') == 1
+
+    @mock.patch.object(DebuggerCache, 'get_command')
+    def test_wait_for_pause_and_run_command(self, *args):
+        """Test wait for run command."""
+        pause_cmd = MockDataGenerator.get_run_cmd(steps=0)
+        empty_view_cmd = MockDataGenerator.get_view_cmd()
+        empty_view_cmd.pop('node_name')
+        run_cmd = MockDataGenerator.get_run_cmd(steps=2)
+        args[0].side_effect = [('0', pause_cmd), ('0', empty_view_cmd), ('0', run_cmd)]
+        setattr(self._server, '_status', ServerStatus.WAITING)
+        res = self._server._wait_for_next_command()
+        assert res == run_cmd
+        assert getattr(self._server, '_continue_steps') == 1
+
+    def test_send_matadata(self):
+        """Test SendMatadata interface."""
+        res = self._server.SendMetadata(MagicMock(training_done=False), MagicMock())
+        assert res == get_ack_reply()
+
+    def test_send_matadata_with_training_done(self):
+        """Test SendMatadata interface."""
+        res = self._server.SendMetadata(MagicMock(training_done=True), MagicMock())
+        assert res == get_ack_reply()
+
+    def test_send_graph(self):
+        """Test SendGraph interface."""
+        res = self._server.SendGraph(MockDataGenerator.get_graph_chunks(), MagicMock())
+        assert res == get_ack_reply()
+
+    def test_send_tensors(self):
+        """Test SendTensors interface."""
+        res = self._server.SendTensors(MockDataGenerator.get_tensors(), MagicMock())
+        assert res == get_ack_reply()
+
+    @mock.patch.object(WatchpointHandler, 'get_watchpoint_by_id')
+    @mock.patch.object(GraphHandler, 'get_node_name_by_full_name')
+    def test_send_watchpoint_hit(self, *args):
+        """Test SendWatchpointHits interface."""
+        args[0].side_effect = [None, 'mock_full_name']
+        watchpoint_hit = MockDataGenerator.get_watchpoint_hit()
+        res = self._server.SendWatchpointHits([watchpoint_hit, watchpoint_hit], MagicMock())
+        assert res == get_ack_reply()
diff --git a/tests/ut/debugger/test_debugger_server.py b/tests/ut/debugger/test_debugger_server.py
new file mode 100644
index 00000000..43bccc8e
--- /dev/null
+++ b/tests/ut/debugger/test_debugger_server.py
@@ -0,0 +1,250 @@
+# Copyright 2020 Huawei Technologies Co., Ltd
+#
+# 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
+#
+# http://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.
+# ============================================================================
+"""
+Function:
+    Test debugger server.
+Usage:
+    pytest tests/ut/debugger/test_debugger_server.py
+"""
+import signal
+from threading import Thread
+from unittest import mock
+from unittest.mock import MagicMock
+
+import grpc
+import pytest
+
+from mindinsight.debugger.common.exceptions.exceptions import DebuggerParamValueError, \
+    DebuggerCompareTensorError, DebuggerCreateWatchPointError, DebuggerDeleteWatchPointError
+from mindinsight.debugger.debugger_cache import DebuggerCache
+from mindinsight.debugger.debugger_server import DebuggerServer
+from mindinsight.debugger.debugger_server import grpc_server_base
+from mindinsight.debugger.proto.debug_grpc_pb2 import RunCMD
+from mindinsight.debugger.stream_handler import GraphHandler, WatchpointHandler, MetadataHandler, \
+    TensorHandler
+from tests.ut.debugger.configurations import compare_debugger_result_with_file, mock_tensor_history
+
+
+class TestDebuggerServer:
+    """Test debugger server."""
+
+    @classmethod
+    def setup_class(cls):
+        """Initialize for test class."""
+        cls._server = None
+
+    def setup_method(self):
+        """Prepare debugger server object."""
+        self._server = DebuggerServer()
+
+    @mock.patch.object(signal, 'signal')
+    @mock.patch.object(Thread, 'join')
+    @mock.patch.object(Thread, 'start')
+    @mock.patch.object(grpc_server_base, 'add_EventListenerServicer_to_server')
+    @mock.patch.object(grpc, 'server')
+    def test_stop_server(self, *args):
+        """Test stop debugger server."""
+        mock_grpc_server_manager = MagicMock()
+        args[0].return_value = mock_grpc_server_manager
+        self._server.start()
+        self._server._stop_handler(MagicMock(), MagicMock())
+        assert self._server.back_server is not None
+        assert self._server.grpc_server_manager == mock_grpc_server_manager
+
+    @mock.patch.object(DebuggerCache, 'get_data')
+    def test_poll_data(self, *args):
+        """Test poll data request."""
+        mock_data = {'pos': 'mock_data'}
+        args[0].return_value = mock_data
+        res = self._server.poll_data('0')
+        assert res == mock_data
+
+    def test_poll_data_with_exept(self):
+        """Test poll data with wrong input."""
+        with pytest.raises(DebuggerParamValueError, match='Pos should be string.'):
+            self._server.poll_data(1)
+
+    @mock.patch.object(GraphHandler, 'search_nodes')
+    def test_search(self, *args):
+        """Test search node."""
+        mock_graph = {'nodes': ['mock_nodes']}
+        args[0].return_value = mock_graph
+        res = self._server.search('mock_name')
+        assert res == mock_graph
+
+    def test_tensor_comparision_with_wrong_status(self):
+        """Test tensor comparison with wrong status."""
+        with pytest.raises(
+                DebuggerCompareTensorError,
+                match='Failed to compare tensors as the MindSpore is not in waiting state.'):
+            self._server.tensor_comparisons(name='mock_node_name:0', shape='[:, :]')
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(GraphHandler, 'get_node_type')
+    @mock.patch.object(GraphHandler, 'get_full_name', return_value='mock_node_name')
+    def test_tensor_comparision_with_wrong_type(self, *args):
+        """Test tensor comparison with wrong type."""
+        args[1].return_value = 'name_scope'
+        with pytest.raises(DebuggerParamValueError, match='The node type must be parameter'):
+            self._server.tensor_comparisons(name='mock_node_name:0', shape='[:, :]')
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(GraphHandler, 'get_node_type', return_value='Parameter')
+    @mock.patch.object(GraphHandler, 'get_full_name', return_value='mock_node_name')
+    @mock.patch.object(TensorHandler, 'get_tensors_diff')
+    def test_tensor_comparision(self, *args):
+        """Test tensor comparison"""
+        mock_diff_res = {'tensor_value': {}}
+        args[0].return_value = mock_diff_res
+        res = self._server.tensor_comparisons('mock_node_name:0', '[:, :]')
+        assert res == mock_diff_res
+
+    def test_retrieve_with_pending(self):
+        """Test retrieve request in pending status."""
+        res = self._server.retrieve(mode='all')
+        assert res.get('metadata', {}).get('state') == 'pending'
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    def test_retrieve_all(self):
+        """Test retrieve request."""
+        res = self._server.retrieve(mode='all')
+        compare_debugger_result_with_file(res, 'debugger_server/retrieve_all.json')
+
+    def test_retrieve_with_invalid_mode(self):
+        """Test retrieve with invalid mode."""
+        with pytest.raises(DebuggerParamValueError, match='Invalid mode.'):
+            self._server.retrieve(mode='invalid_mode')
+
+    @mock.patch.object(GraphHandler, 'get')
+    @mock.patch.object(GraphHandler, 'get_node_type', return_value='name_scope')
+    @mock.patch.object(GraphHandler, 'get_full_name', return_value='mock_node_name')
+    def test_retrieve_node(self, *args):
+        """Test retrieve node information."""
+        mock_graph = {'graph': {}}
+        args[2].return_value = mock_graph
+        res = self._server._retrieve_node({'name': 'mock_node_name'})
+        assert res == mock_graph
+
+    def test_retrieve_tensor_history_with_pending(self):
+        """Test retrieve request in pending status."""
+        res = self._server.retrieve_tensor_history('mock_node_name')
+        assert res.get('metadata', {}).get('state') == 'pending'
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(GraphHandler, 'get_tensor_history')
+    @mock.patch.object(GraphHandler, 'get_node_type', return_value='Parameter')
+    def test_retrieve_tensor_history(self, *args):
+        """Test retrieve tensor history."""
+        args[1].return_value = mock_tensor_history()
+        res = self._server.retrieve_tensor_history('mock_node_name')
+        compare_debugger_result_with_file(res, 'debugger_server/retrieve_tensor_history.json')
+
+    @mock.patch.object(GraphHandler, 'get_node_type')
+    def test_validate_leaf_name(self, *args):
+        """Test validate leaf name."""
+        args[0].return_value = 'name_scope'
+        with pytest.raises(DebuggerParamValueError, match='Invalid leaf node name.'):
+            self._server._validate_leaf_name(node_name='mock_node_name')
+
+    @mock.patch.object(TensorHandler, 'get')
+    @mock.patch.object(DebuggerServer, '_get_tensor_name_and_type_by_ui_name')
+    def test_retrieve_tensor_value(self, *args):
+        """Test retrieve tensor value."""
+        mock_tensor_value = {'tensor_value': {'name': 'mock_name:0'}}
+        args[0].return_value = ('Parameter', 'mock_node_name')
+        args[1].return_value = mock_tensor_value
+        res = self._server.retrieve_tensor_value('mock_name:0', 'data', '[:, :]')
+        assert res == mock_tensor_value
+
+    @mock.patch.object(WatchpointHandler, 'get')
+    def test_retrieve_watchpoints(self, *args):
+        """Test retrieve watchpoints."""
+        mock_watchpoint = {'watch_points': {}}
+        args[0].return_value = mock_watchpoint
+        res = self._server._retrieve_watchpoint({})
+        assert res == mock_watchpoint
+
+    @mock.patch.object(DebuggerServer, '_retrieve_node')
+    def test_retrieve_watchpoint(self, *args):
+        """Test retrieve single watchpoint."""
+        mock_watchpoint = {'nodes': {}}
+        args[0].return_value = mock_watchpoint
+        res = self._server._retrieve_watchpoint({'watch_point_id': 1})
+        assert res == mock_watchpoint
+
+    @mock.patch.object(DebuggerServer, '_validate_leaf_name')
+    @mock.patch.object(DebuggerServer, '_get_tensor_history')
+    @mock.patch.object(DebuggerServer, '_get_nodes_info', return_value={'graph': {}})
+    def test_retrieve_watchpoint_hit(self, *args):
+        """Test retrieve single watchpoint."""
+        args[1].return_value = {'tensor_history': {}}
+        res = self._server._retrieve_watchpoint_hit({'name': 'hit_node_name', 'single_node': True})
+        assert res == {'tensor_history': {}, 'graph': {}}
+
+    def test_create_watchpoint_with_wrong_state(self):
+        """Test create watchpoint with wrong state."""
+        with pytest.raises(DebuggerCreateWatchPointError, match='Failed to create watchpoint'):
+            self._server.create_watchpoint(watch_condition={'condition': 'INF'})
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(GraphHandler, 'get_full_name', return_value='mock_full_name')
+    @mock.patch.object(GraphHandler, 'get_full_name', return_value='mock_full_name')
+    @mock.patch.object(GraphHandler, 'get_nodes_by_scope', return_value=[MagicMock()])
+    @mock.patch.object(GraphHandler, 'get_node_type', return_value='aggregation_scope')
+    @mock.patch.object(WatchpointHandler, 'create_watchpoint')
+    def test_create_watchpoint(self, *args):
+        """Test create watchpoint."""
+        args[0].return_value = 1
+        res = self._server.create_watchpoint({'condition': 'INF'}, ['watch_node_name'])
+        assert res == {'id': 1}
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(GraphHandler, 'get_searched_node_list')
+    @mock.patch.object(WatchpointHandler, 'validate_watchpoint_id')
+    @mock.patch.object(WatchpointHandler, 'update_watchpoint')
+    def test_update_watchpoint(self, *args):
+        """Test update watchpoint."""
+        args[2].return_value = [MagicMock(name='seatch_name/op_name')]
+        res = self._server.update_watchpoint(
+            watch_point_id=1, watch_nodes=['search_name'], mode=1, name='search_name')
+        assert res == {}
+
+    def test_delete_watchpoint_with_wrong_state(self):
+        """Test delete watchpoint with wrong state."""
+        with pytest.raises(DebuggerDeleteWatchPointError, match='Failed to delete watchpoint'):
+            self._server.delete_watchpoint(watch_point_id=1)
+
+    @mock.patch.object(MetadataHandler, 'state', 'waiting')
+    @mock.patch.object(WatchpointHandler, 'delete_watchpoint')
+    def test_delete_watchpoint(self, *args):
+        """Test delete watchpoint with wrong state."""
+        args[0].return_value = None
+        res = self._server.delete_watchpoint(1)
+        assert res == {}
+
+    @pytest.mark.parametrize('mode, cur_state, state', [
+        ('continue', 'waiting', 'running'),
+        ('pause', 'running', 'waiting'),
+        ('terminate', 'waiting', 'pending')])
+    def test_control(self, mode, cur_state, state):
+        """Test control request."""
+        with mock.patch.object(MetadataHandler, 'state', cur_state):
+            res = self._server.control({'mode': mode})
+            assert res == {'metadata': {'state': state}}
+
+    def test_construct_run_event(self):
+        """Test construct run event."""
+        res = self._server._construct_run_event({'level': 'node'})
+        assert res.run_cmd == RunCMD(run_level='node', node_name='')