Context test failed due to function code overwritten. (#2758)

Author: janiversen

test/CHECK_COVERAGE

@@ -0,0 +1,8 @@
+
+datastore
+server
+simulator
+global
+
+- find task exception
+- coverage 98%

test/datastore/test_context.py

@@ -0,0 +1,83 @@
+"""Test framers."""
+import pytest
+
+from pymodbus.datastore import (
+    ModbusBaseDeviceContext,
+    ModbusDeviceContext,
+    ModbusServerContext,
+)
+from pymodbus.exceptions import NoSuchIdException
+
+
+class TestContextDataStore:
+    """Unittest for the pymodbus.datastore.remote module."""
+
+    def test_datastore_base_device(self):
+        """Test ModbusDeviceContext."""
+        dev = ModbusBaseDeviceContext()
+        dev.getValues(0x01, 0x01)
+        dev.setValues(0x05, 0x01, None)
+
+    def test_datastore_device(self):
+        """Test ModbusDeviceContext."""
+        dev = ModbusDeviceContext()
+        str(dev)
+        dev.reset()
+
+    def test_datastore_device_Values(self):
+        """Test ModbusDeviceContext."""
+        dev = ModbusDeviceContext()
+        dev.getValues(0x01, 0x05)
+        dev.setValues(0x05, 0x05, [17])
+
+    def test_datastore_device_register(self):
+        """Test ModbusDeviceContext."""
+        dev = ModbusDeviceContext()
+        dev.register(0x77, "device register test")
+
+    def test_datastore_server(self):
+        """Test ModbusServerContext."""
+        dev = ModbusServerContext()
+        str(dev)
+        dev = ModbusServerContext(devices={})
+        dev = ModbusServerContext(single=False)
+        dev = ModbusServerContext(devices={1: {}}, single=False)
+
+    def test_datastore_server_iter(self):
+        """Test ModbusServerContext."""
+        dev = ModbusServerContext()
+        _ = list(dev)
+
+    def test_datastore_server_contains(self):
+        """Test ModbusServerContext."""
+        dev = ModbusServerContext()
+        assert 0 in dev
+        dev2 = ModbusServerContext()
+        dev2.single = False
+        assert 0 in dev2
+
+    def test_datastore_server_set(self):
+        """Test ModbusServerContext."""
+        dev = ModbusDeviceContext()
+        srv = ModbusServerContext()
+        srv[1] = dev
+        srv.single = False
+        srv[2] = dev
+        del srv[2]
+        with pytest.raises(NoSuchIdException):
+            srv[2000] = dev
+        with pytest.raises(NoSuchIdException):
+            del srv[2000]
+
+    def test_datastore_server_get(self):
+        """Test ModbusServerContext."""
+        srv = ModbusServerContext()
+        assert srv[0] == {}
+        #srv.single = False
+        #with pytest.raises(NoSuchIdException):
+        #    _ = srv[200]
+
+    def test_datastore_server_ids(self):
+        """Test ModbusServerContext."""
+        srv = ModbusServerContext()
+        assert isinstance(srv.device_ids(), list)