def test_init_invalid_type(self): """Test symbol lookup when type cannot be found There was a read/write check that verifies the plc_typ was not None, but this was removed. """ var = PLCVariable(name="UnknownType", ads_type=0, symbol_type="non_existent_type") var.index_group = 123 var.index_offset = 100 var.plc_type = constants.PLCTYPE_BYTE # Set to something real self.handler.add_variable(var) with self.plc: # Create symbol while providing everything: symbol = AdsSymbol(self.plc, name=var.name) self.assertEqual(var.symbol_type, symbol.symbol_type) self.assertIsNone(symbol.plc_type) # with self.assertRaises(ValueError) as cm: # # Without type specified, it cannot read # symbol.read() # self.assertIn('Cannot read or write', str(cm.exception)) with self.assertRaises(TypeError) as cm: # Error is thrown inside pyads_ex symbol.read() self.assertIn("NoneType", str(cm.exception)) self.assertAdsRequestsCount(1) # Only a WRITE followed by a READ
def test_init_manual(self): """Test symbol without lookup""" with self.plc: # Create symbol while providing everything: symbol = AdsSymbol( self.plc, name=self.test_var.name, index_group=self.test_var.index_group, index_offset=self.test_var.index_offset, symbol_type=self.test_var.symbol_type, ) self.assertAdsRequestsCount(0) # No requests yet self.plc.write( self.test_var.index_group, self.test_var.index_offset, 12.3, self.test_var.plc_type, ) self.assertEqual(12.3, symbol.read()) self.assertAdsRequestsCount(2) # Only a WRITE followed by a READ
def test_read_write_errors(self): """Test read/write on invalid AdsSymbol There was a read/write check that verifies the plc_typ was not None, but this was removed. """ symbol = AdsSymbol(self.plc, "MySymbol", 123, 0, "BYTE") with self.assertRaises(ValueError) as cm: symbol.read() # Cannot read with unopened Connection self.assertIn("missing or closed Connection", str(cm.exception)) self.plc.open() symbol.index_offset = None # Set index to something invalid # with self.assertRaises(ValueError) as cm: # symbol.read() # Cannot read with invalid index # self.assertIn('invalid values for', str(cm.exception)) with self.assertRaises(TypeError) as cm: symbol.read() # Catch error inside pyads_ex self.assertIn("integer is required", str(cm.exception)) symbol.index_group = None with self.assertRaises(TypeError) as cm: symbol.read() # Catch error inside pyads_ex self.assertIn("integer is required", str(cm.exception)) symbol.index_offset = 'A' with self.assertRaises(TypeError) as cm: symbol.read() # Catch error inside pyads_ex self.assertIn("integer is required", str(cm.exception)) symbol.index_group = 'B' with self.assertRaises(TypeError) as cm: symbol.read() # Catch error inside pyads_ex self.assertIn("integer is required", str(cm.exception))
def test_init_by_name_array(self): """Test symbol creation when it's an array""" var = PLCVariable( "ArrayVar", ads_type=constants.ADST_INT16, # dataType does not represent # array unfortunately symbol_type="ARRAY [1..5] OF INT", # Array looks like this in PLC ) var.plc_type = constants.PLCTYPE_ARR_INT(5) # Have to do this # manually self.handler.add_variable(var) self.plc.open() symbol = AdsSymbol(self.plc, name=var.name) # Verify looked up info self.assertEqual(var.name, symbol.name) self.assertEqual(var.index_group, symbol.index_group) self.assertEqual(var.index_offset, symbol.index_offset) self.assertEqual(var.plc_type, symbol.plc_type) self.assertEqual(var.symbol_type, symbol.symbol_type) self.assertIsNone(symbol.comment) my_list = symbol.read() self.assertIsInstance(my_list, list) self.assertEqual(5, len(my_list)) my_list[4] = 420 symbol.write(my_list) # Modify array my_list2 = symbol.read() # Read again self.assertEqual(my_list, my_list2) self.assertAdsRequestsCount(4) # A READWRITE (for info), READ,
def test_value(self): """Test the buffer property""" with self.plc: symbol = AdsSymbol(self.plc, name=self.test_var.name) symbol.value = 420.0 # Shouldn't change anything yet self.assertAdsRequestsCount(1) # Only a READWRITE for info symbol.write() self.assertAdsRequestsCount(2) # Written from buffer symbol.read() for i in range(10): custom_buffer = symbol.value self.assertEqual(420.0, symbol.value) self.assertAdsRequestsCount(3) # Read only once
def test_init_invalid_type(self): """Test symbol lookup when type cannot be found There was a read/write check that verifies the plc_typ was not None, but this was removed. """ var = PLCVariable("UnknownType", b"\x00", ads_type=constants.ADST_VOID, symbol_type="non_existent_type", index_group=123, index_offset=100) self.handler.add_variable(var) with self.plc: # Create symbol while providing everything: symbol = AdsSymbol(self.plc, name=var.name) self.assertEqual(var.symbol_type, symbol.symbol_type) with self.assertRaises(TypeError) as cm: # Error is thrown inside pyads_ex symbol.read() self.assertIn("NoneType", str(cm.exception)) self.assertAdsRequestsCount(1) # Only a WRITE followed by a READ
def test_read(self): """Test symbol value reading""" with self.plc: self.plc.write( self.test_var.index_group, self.test_var.index_offset, 420.0, self.test_var.plc_type, ) symbol = AdsSymbol(self.plc, name=self.test_var.name) self.assertEqual(420.0, symbol.read()) self.assertAdsRequestsCount(3) # WRITE, READWRITE for info and