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"""Tests for plugins."""
import os.path
import coverage
from coverage.codeunit import CodeUnit
from coverage.parser import CodeParser
from coverage.plugin import Plugins, overrides
from tests.coveragetest import CoverageTest
class FakeConfig(object):
"""A fake config for use in tests."""
def __init__(self, plugin, options):
self.plugin = plugin
self.options = options
self.asked_for = []
def get_plugin_options(self, module):
"""Just return the options for `module` if this is the right module."""
self.asked_for.append(module)
if module == self.plugin:
return self.options
else:
return {}
class PluginUnitTest(CoverageTest):
"""Test Plugins.load_plugins directly."""
def test_importing_and_configuring(self):
self.make_file("plugin1.py", """\
from coverage import CoveragePlugin
class Plugin(CoveragePlugin):
def __init__(self, options):
super(Plugin, self).__init__(options)
self.this_is = "me"
""")
config = FakeConfig("plugin1", {'a':'hello'})
plugins = list(Plugins.load_plugins(["plugin1"], config))
self.assertEqual(len(plugins), 1)
self.assertEqual(plugins[0].this_is, "me")
self.assertEqual(plugins[0].options, {'a':'hello'})
self.assertEqual(config.asked_for, ['plugin1'])
def test_importing_and_configuring_more_than_one(self):
self.make_file("plugin1.py", """\
from coverage import CoveragePlugin
class Plugin(CoveragePlugin):
def __init__(self, options):
super(Plugin, self).__init__(options)
self.this_is = "me"
""")
self.make_file("plugin2.py", """\
from coverage import CoveragePlugin
class Plugin(CoveragePlugin):
pass
""")
config = FakeConfig("plugin1", {'a':'hello'})
plugins = list(Plugins.load_plugins(["plugin1", "plugin2"], config))
self.assertEqual(len(plugins), 2)
self.assertEqual(plugins[0].this_is, "me")
self.assertEqual(plugins[0].options, {'a':'hello'})
self.assertEqual(plugins[1].options, {})
self.assertEqual(config.asked_for, ['plugin1', 'plugin2'])
def test_cant_import(self):
with self.assertRaises(ImportError):
_ = Plugins.load_plugins(["plugin_not_there"], None)
def test_ok_to_not_define_plugin(self):
self.make_file("plugin2.py", """\
from coverage import CoveragePlugin
Nothing = 0
""")
plugins = list(Plugins.load_plugins(["plugin2"], None))
self.assertEqual(plugins, [])
class PluginTest(CoverageTest):
"""Test plugins through the Coverage class."""
def test_plugin_imported(self):
# Prove that a plugin will be imported.
self.make_file("my_plugin.py", """\
with open("evidence.out", "w") as f:
f.write("we are here!")
""")
self.assert_doesnt_exist("evidence.out")
_ = coverage.Coverage(plugins=["my_plugin"])
with open("evidence.out") as f:
self.assertEqual(f.read(), "we are here!")
def test_missing_plugin_raises_import_error(self):
# Prove that a missing plugin will raise an ImportError.
with self.assertRaises(ImportError):
cov = coverage.Coverage(plugins=["does_not_exist_woijwoicweo"])
cov.start()
def test_bad_plugin_isnt_hidden(self):
# Prove that a plugin with an error in it will raise the error.
self.make_file("plugin_over_zero.py", """\
1/0
""")
with self.assertRaises(ZeroDivisionError):
_ = coverage.Coverage(plugins=["plugin_over_zero"])
def test_importing_myself(self):
self.make_file("simple.py", """\
import try_xyz
a = 1
b = 2
""")
self.make_file("try_xyz.py", """\
c = 3
d = 4
""")
cov = coverage.Coverage(plugins=["tests.test_plugins"])
# Import the python file, executing it.
self.start_import_stop(cov, "simple")
_, statements, missing, _ = cov.analysis("simple.py")
self.assertEqual(statements, [1,2,3])
self.assertEqual(missing, [])
_, statements, _, _ = cov.analysis("/src/try_ABC.zz")
self.assertEqual(statements, [105, 106, 107, 205, 206, 207])
class Plugin(coverage.CoveragePlugin):
def trace_judge(self, disp):
if "xyz.py" in disp.original_filename:
disp.trace = True
disp.source_filename = os.path.join(
"/src",
os.path.basename(
disp.original_filename.replace("xyz.py", "ABC.zz")
)
)
def line_number_range(self, frame):
lineno = frame.f_lineno
return lineno*100+5, lineno*100+7
def code_unit_class(self, filename):
return PluginCodeUnit
class PluginCodeUnit(CodeUnit):
def get_parser(self, exclude=None):
return PluginParser()
class PluginParser(CodeParser):
def parse_source(self):
return set([105, 106, 107, 205, 206, 207]), set([])
class OverridesTest(CoverageTest):
"""Test plugins.py:overrides."""
run_in_temp_dir = False
def test_overrides(self):
class SomeBase(object):
"""Base class, two base methods."""
def method1(self):
pass
def method2(self):
pass
class Derived1(SomeBase):
"""Simple single inheritance."""
def method1(self):
pass
self.assertTrue(overrides(Derived1(), "method1", SomeBase))
self.assertFalse(overrides(Derived1(), "method2", SomeBase))
class FurtherDerived1(Derived1):
"""Derive again from Derived1, inherit its method1."""
pass
self.assertTrue(overrides(FurtherDerived1(), "method1", SomeBase))
self.assertFalse(overrides(FurtherDerived1(), "method2", SomeBase))
class FurtherDerived2(Derived1):
"""Override the overridden method."""
def method1(self):
pass
self.assertTrue(overrides(FurtherDerived2(), "method1", SomeBase))
self.assertFalse(overrides(FurtherDerived2(), "method2", SomeBase))
class Mixin(object):
"""A mixin that overrides method1."""
def method1(self):
pass
class Derived2(Mixin, SomeBase):
"""A class that gets the method from the mixin."""
pass
self.assertTrue(overrides(Derived2(), "method1", SomeBase))
self.assertFalse(overrides(Derived2(), "method2", SomeBase))
|
