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
