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import pytest
from napari_plugin_engine import (
HookImplementationMarker,
HookSpecificationMarker,
PluginValidationError,
)
hookspec = HookSpecificationMarker("example")
hookimpl = HookImplementationMarker("example")
def test_argmismatch(pm):
class Api:
@hookspec
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
class Plugin:
@hookimpl
def hello(self, argwrong):
pass
with pytest.raises(PluginValidationError) as exc:
pm.register(Plugin())
assert "argwrong" in str(exc.value)
def test_only_kwargs(pm):
class Api:
@hookspec
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
with pytest.raises(TypeError) as exc:
pm.hook.hello(3)
comprehensible = "hook calling supports only keyword arguments"
assert comprehensible in str(exc.value)
def test_opt_in_args(pm):
"""Verfiy that two hookimpls with mutex args can serve
under the same spec.
"""
class Api:
@hookspec
def hello(self, arg1, arg2, common_arg):
"api hook 1"
class Plugin1:
@hookimpl
def hello(self, arg1, common_arg):
return arg1 + common_arg
class Plugin2:
@hookimpl
def hello(self, arg2, common_arg):
return arg2 + common_arg
pm.add_hookspecs(Api)
pm.register(Plugin1())
pm.register(Plugin2())
results = pm.hook.hello(arg1=1, arg2=2, common_arg=0)
assert results == [2, 1]
def test_call_order(pm):
class Api:
@hookspec
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
class Plugin1:
@hookimpl
def hello(self, arg):
return 1
class Plugin2:
@hookimpl
def hello(self, arg):
return 2
class Plugin3:
@hookimpl
def hello(self, arg):
return 3
class Plugin4:
@hookimpl(hookwrapper=True)
def hello(self, arg):
assert arg == 0
outcome = yield
assert outcome.result == [3, 2, 1]
pm.register(Plugin1())
pm.register(Plugin2())
pm.register(Plugin3())
pm.register(Plugin4()) # hookwrapper should get same list result
res = pm.hook.hello(arg=0)
assert res == [3, 2, 1]
def test_firstresult_definition(pm):
class Api:
@hookspec(firstresult=True)
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
class Plugin1:
@hookimpl
def hello(self, arg):
return arg + 1
class Plugin2:
@hookimpl
def hello(self, arg):
return arg - 1
class Plugin3:
@hookimpl
def hello(self, arg):
return None
class Plugin4:
@hookimpl(hookwrapper=True)
def hello(self, arg):
assert arg == 3
outcome = yield
assert outcome.result == 2
pm.register(Plugin1()) # discarded - not the last registered plugin
pm.register(Plugin2()) # used as result
pm.register(Plugin3()) # None result is ignored
pm.register(Plugin4()) # hookwrapper should get same non-list result
res = pm.hook.hello(arg=3)
assert res == 2
def test_firstresult_force_result(pm):
"""Verify forcing a result in a wrapper."""
class Api:
@hookspec(firstresult=True)
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
class Plugin1:
@hookimpl
def hello(self, arg):
return arg + 1
class Plugin2:
@hookimpl(hookwrapper=True)
def hello(self, arg):
assert arg == 3
outcome = yield
assert outcome.result == 4
outcome.force_result(0)
class Plugin3:
@hookimpl
def hello(self, arg):
return None
pm.register(Plugin1())
pm.register(Plugin2()) # wrapper
pm.register(Plugin3()) # ignored since returns None
res = pm.hook.hello(arg=3)
assert res == 0 # this result is forced and not a list
def test_firstresult_returns_none(pm):
"""If None results are returned by underlying implementations ensure
the multi-call loop returns a None value.
"""
class Api:
@hookspec(firstresult=True)
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
class Plugin1:
@hookimpl
def hello(self, arg):
return None
pm.register(Plugin1())
res = pm.hook.hello(arg=3)
assert res is None
def test_firstresult_no_plugin(pm):
"""If no implementations/plugins have been registered for a firstresult
hook the multi-call loop should return a None value.
"""
class Api:
@hookspec(firstresult=True)
def hello(self, arg):
"api hook 1"
pm.add_hookspecs(Api)
res = pm.hook.hello(arg=3)
assert res is None
|
