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# coding=utf-8
"""
Test plugin infrastructure and hooks.
Copyright 2018 Jared Crapo <jared@kotfu.net>
Released under MIT license, see LICENSE file
"""
from typing import Tuple
import pytest
import cmd2
from .conftest import StdOut
class Plugin:
"A mixin class for testing hook registration and calling"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.reset_counters()
def reset_counters(self):
self.called_pph = 0
def pph(self, statement: cmd2.Statement) -> Tuple[bool, cmd2.Statement]:
self.called_pph += 1
return False, statement
def pph_stop(self, statement: cmd2.Statement) -> Tuple[bool, cmd2.Statement]:
self.called_pph += 1
return True, statement
def pph_emptystatement(self, statement: cmd2.Statement) -> Tuple[bool, cmd2.Statement]:
self.called_pph += 1
raise cmd2.EmptyStatement
def pph_exception(self, statement: cmd2.Statement) -> Tuple[bool, cmd2.Statement]:
self.called_pph += 1
raise ValueError
class PluggedApp(Plugin, cmd2.Cmd):
"A sample app with a plugin mixed in"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def do_say(self, statement):
"""Repeat back the arguments"""
self.poutput(statement)
###
#
# test hooks
#
###
def test_postparsing_hook(capsys):
app = PluggedApp()
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert out == 'hello\n'
assert not err
assert not app.called_pph
app.reset_counters()
app.register_postparsing_hook(app.pph)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert out == 'hello\n'
assert not err
assert app.called_pph == 1
# register the function again, so it should be called
# twice
app.reset_counters()
app.register_postparsing_hook(app.pph)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert out == 'hello\n'
assert not err
assert app.called_pph == 2
def test_postparsing_hook_stop_first(capsys):
app = PluggedApp()
app.register_postparsing_hook(app.pph_stop)
stop = app.onecmd_plus_hooks('say hello')
assert app.called_pph == 1
assert stop
# register another function but it shouldn't be called
app.reset_counters()
app.register_postparsing_hook(app.pph)
stop = app.onecmd_plus_hooks('say hello')
assert app.called_pph == 1
assert stop
def test_postparsing_hook_stop_second(capsys):
app = PluggedApp()
app.register_postparsing_hook(app.pph)
stop = app.onecmd_plus_hooks('say hello')
assert app.called_pph == 1
assert not stop
# register another function and make sure it gets called
app.reset_counters()
app.register_postparsing_hook(app.pph_stop)
stop = app.onecmd_plus_hooks('say hello')
assert app.called_pph == 2
assert stop
# register a third function which shouldn't be called
app.reset_counters()
app.register_postparsing_hook(app.pph)
stop = app.onecmd_plus_hooks('say hello')
assert app.called_pph == 2
assert stop
def test_postparsing_hook_emptystatement_first(capsys):
app = PluggedApp()
app.register_postparsing_hook(app.pph_emptystatement)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert not err
assert app.called_pph == 1
# register another function but it shouldn't be called
app.reset_counters()
app.register_postparsing_hook(app.pph)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert not err
assert app.called_pph == 1
def test_postparsing_hook_emptystatement_second(capsys):
app = PluggedApp()
app.register_postparsing_hook(app.pph)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert out == 'hello\n'
assert not err
assert app.called_pph == 1
# register another function and make sure it gets called
app.reset_counters()
app.register_postparsing_hook(app.pph_emptystatement)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert not err
assert app.called_pph == 2
# register a third function which shouldn't be called
app.reset_counters()
app.register_postparsing_hook(app.pph)
stop = app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert not err
assert app.called_pph == 2
assert not stop
def test_postparsing_hook_exception(capsys):
app = PluggedApp()
app.register_postparsing_hook(app.pph_exception)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert err
assert app.called_pph == 1
# register another function, but it shouldn't be called
app.reset_counters()
app.register_postparsing_hook(app.pph)
app.onecmd_plus_hooks('say hello')
out, err = capsys.readouterr()
assert not out
assert err
assert app.called_pph == 1
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