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from unittest import TestCase
from .._methodical import MethodicalMachine
class SampleObject(object):
mm = MethodicalMachine()
@mm.state(initial=True)
def begin(self):
"initial state"
@mm.state()
def middle(self):
"middle state"
@mm.state()
def end(self):
"end state"
@mm.input()
def go1(self):
"sample input"
@mm.input()
def go2(self):
"sample input"
@mm.input()
def back(self):
"sample input"
@mm.output()
def out(self):
"sample output"
setTrace = mm._setTrace
begin.upon(go1, middle, [out])
middle.upon(go2, end, [out])
end.upon(back, middle, [])
middle.upon(back, begin, [])
class TraceTests(TestCase):
def test_only_inputs(self):
traces = []
def tracer(old_state, input, new_state):
traces.append((old_state, input, new_state))
return None # "I only care about inputs, not outputs"
s = SampleObject()
s.setTrace(tracer)
s.go1()
self.assertEqual(traces, [("begin", "go1", "middle"),
])
s.go2()
self.assertEqual(traces, [("begin", "go1", "middle"),
("middle", "go2", "end"),
])
s.setTrace(None)
s.back()
self.assertEqual(traces, [("begin", "go1", "middle"),
("middle", "go2", "end"),
])
s.go2()
self.assertEqual(traces, [("begin", "go1", "middle"),
("middle", "go2", "end"),
])
def test_inputs_and_outputs(self):
traces = []
def tracer(old_state, input, new_state):
traces.append((old_state, input, new_state, None))
def trace_outputs(output):
traces.append((old_state, input, new_state, output))
return trace_outputs # "I care about outputs too"
s = SampleObject()
s.setTrace(tracer)
s.go1()
self.assertEqual(traces, [("begin", "go1", "middle", None),
("begin", "go1", "middle", "out"),
])
s.go2()
self.assertEqual(traces, [("begin", "go1", "middle", None),
("begin", "go1", "middle", "out"),
("middle", "go2", "end", None),
("middle", "go2", "end", "out"),
])
s.setTrace(None)
s.back()
self.assertEqual(traces, [("begin", "go1", "middle", None),
("begin", "go1", "middle", "out"),
("middle", "go2", "end", None),
("middle", "go2", "end", "out"),
])
s.go2()
self.assertEqual(traces, [("begin", "go1", "middle", None),
("begin", "go1", "middle", "out"),
("middle", "go2", "end", None),
("middle", "go2", "end", "out"),
])