def test_trace(self): v = Variable(self.root) vname = str(v) trace = [] def read_tracer(*args): trace.append(('read', ) + args) def write_tracer(*args): trace.append(('write', ) + args) cb1 = v.trace_variable('r', read_tracer) cb2 = v.trace_variable('wu', write_tracer) self.assertEqual(sorted(v.trace_vinfo()), [('r', cb1), ('wu', cb2)]) self.assertEqual(trace, []) v.set('spam') self.assertEqual(trace, [('write', vname, '', 'w')]) trace = [] v.get() self.assertEqual(trace, [('read', vname, '', 'r')]) trace = [] info = sorted(v.trace_vinfo()) v.trace_vdelete('w', cb1) # Wrong mode self.assertEqual(sorted(v.trace_vinfo()), info) with self.assertRaises(TclError): v.trace_vdelete('r', 'spam') # Wrong command name self.assertEqual(sorted(v.trace_vinfo()), info) v.trace_vdelete('r', (cb1, 43)) # Wrong arguments self.assertEqual(sorted(v.trace_vinfo()), info) v.get() self.assertEqual(trace, [('read', vname, '', 'r')]) trace = [] v.trace_vdelete('r', cb1) self.assertEqual(v.trace_vinfo(), [('wu', cb2)]) v.get() self.assertEqual(trace, []) trace = [] del write_tracer gc_collect() v.set('eggs') self.assertEqual(trace, [('write', vname, '', 'w')])