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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Tests for context support."""
import inspect
import os.path
import coverage
from coverage import env
from coverage.context import qualname_from_frame
from coverage.data import CoverageData
from coverage.misc import CoverageException
from tests.coveragetest import CoverageTest
class StaticContextTest(CoverageTest):
"""Tests of the static context."""
def setUp(self):
super(StaticContextTest, self).setUp()
self.skip_unless_data_storage_is("sql")
def test_no_context(self):
self.make_file("main.py", "a = 1")
cov = coverage.Coverage()
self.start_import_stop(cov, "main")
data = cov.get_data()
self.assertCountEqual(data.measured_contexts(), [""])
def test_static_context(self):
self.make_file("main.py", "a = 1")
cov = coverage.Coverage(context="gooey")
self.start_import_stop(cov, "main")
data = cov.get_data()
self.assertCountEqual(data.measured_contexts(), ["gooey"])
SOURCE = """\
a = 1
if a > 2:
a = 3
assert a == 1
"""
LINES = [1, 2, 4]
ARCS = [(-1, 1), (1, 2), (2, 4), (4, -1)]
def run_red_blue(self, **options):
"""Run red.py and blue.py, and return their CoverageData objects."""
self.make_file("red.py", self.SOURCE)
red_cov = coverage.Coverage(context="red", data_suffix="r", source=["."], **options)
self.start_import_stop(red_cov, "red")
red_cov.save()
red_data = red_cov.get_data()
self.make_file("blue.py", self.SOURCE)
blue_cov = coverage.Coverage(context="blue", data_suffix="b", source=["."], **options)
self.start_import_stop(blue_cov, "blue")
blue_cov.save()
blue_data = blue_cov.get_data()
return red_data, blue_data
def test_combining_line_contexts(self):
red_data, blue_data = self.run_red_blue()
for datas in [[red_data, blue_data], [blue_data, red_data]]:
combined = CoverageData(suffix="combined")
for data in datas:
combined.update(data)
self.assertEqual(combined.measured_contexts(), {'red', 'blue'})
full_names = {os.path.basename(f): f for f in combined.measured_files()}
self.assertCountEqual(full_names, ['red.py', 'blue.py'])
fred = full_names['red.py']
fblue = full_names['blue.py']
self.assertEqual(combined.lines(fred, context='red'), self.LINES)
self.assertEqual(combined.lines(fred, context='blue'), [])
self.assertEqual(combined.lines(fblue, context='red'), [])
self.assertEqual(combined.lines(fblue, context='blue'), self.LINES)
def test_combining_arc_contexts(self):
red_data, blue_data = self.run_red_blue(branch=True)
for datas in [[red_data, blue_data], [blue_data, red_data]]:
combined = CoverageData(suffix="combined")
for data in datas:
combined.update(data)
self.assertEqual(combined.measured_contexts(), {'red', 'blue'})
full_names = {os.path.basename(f): f for f in combined.measured_files()}
self.assertCountEqual(full_names, ['red.py', 'blue.py'])
fred = full_names['red.py']
fblue = full_names['blue.py']
self.assertEqual(combined.lines(fred, context='red'), self.LINES)
self.assertEqual(combined.lines(fred, context='blue'), [])
self.assertEqual(combined.lines(fblue, context='red'), [])
self.assertEqual(combined.lines(fblue, context='blue'), self.LINES)
self.assertEqual(combined.arcs(fred, context='red'), self.ARCS)
self.assertEqual(combined.arcs(fred, context='blue'), [])
self.assertEqual(combined.arcs(fblue, context='red'), [])
self.assertEqual(combined.arcs(fblue, context='blue'), self.ARCS)
class DynamicContextTest(CoverageTest):
"""Tests of dynamically changing contexts."""
def setUp(self):
super(DynamicContextTest, self).setUp()
self.skip_unless_data_storage_is("sql")
if not env.C_TRACER:
self.skipTest("Only the C tracer supports dynamic contexts")
SOURCE = """\
def helper(lineno):
x = 2
def test_one():
a = 5
helper(6)
def test_two():
a = 9
b = 10
if a > 11:
b = 12
assert a == (13-4)
assert b == (14-4)
helper(15)
test_one()
x = 18
helper(19)
test_two()
"""
OUTER_LINES = [1, 4, 8, 17, 18, 19, 2, 20]
TEST_ONE_LINES = [5, 6, 2]
TEST_TWO_LINES = [9, 10, 11, 13, 14, 15, 2]
def test_dynamic_alone(self):
self.make_file("two_tests.py", self.SOURCE)
cov = coverage.Coverage(source=["."])
cov.set_option("run:dynamic_context", "test_function")
self.start_import_stop(cov, "two_tests")
data = cov.get_data()
full_names = {os.path.basename(f): f for f in data.measured_files()}
fname = full_names["two_tests.py"]
self.assertCountEqual(data.measured_contexts(), ["", "test_one", "test_two"])
self.assertCountEqual(data.lines(fname, ""), self.OUTER_LINES)
self.assertCountEqual(data.lines(fname, "test_one"), self.TEST_ONE_LINES)
self.assertCountEqual(data.lines(fname, "test_two"), self.TEST_TWO_LINES)
def test_static_and_dynamic(self):
self.make_file("two_tests.py", self.SOURCE)
cov = coverage.Coverage(context="stat", source=["."])
cov.set_option("run:dynamic_context", "test_function")
self.start_import_stop(cov, "two_tests")
data = cov.get_data()
full_names = {os.path.basename(f): f for f in data.measured_files()}
fname = full_names["two_tests.py"]
self.assertCountEqual(data.measured_contexts(), ["stat", "stat:test_one", "stat:test_two"])
self.assertCountEqual(data.lines(fname, "stat"), self.OUTER_LINES)
self.assertCountEqual(data.lines(fname, "stat:test_one"), self.TEST_ONE_LINES)
self.assertCountEqual(data.lines(fname, "stat:test_two"), self.TEST_TWO_LINES)
class DynamicContextWithPythonTracerTest(CoverageTest):
"""The Python tracer doesn't do dynamic contexts at all."""
run_in_temp_dir = False
def test_python_tracer_fails_properly(self):
if env.C_TRACER:
self.skipTest("This test is specifically about the Python tracer.")
cov = coverage.Coverage()
cov.set_option("run:dynamic_context", "test_function")
msg = r"Can't support dynamic contexts with PyTracer"
with self.assertRaisesRegex(CoverageException, msg):
cov.start()
def get_qualname():
"""Helper to return qualname_from_frame for the caller."""
stack = inspect.stack()[1:]
if any(sinfo[0].f_code.co_name == "get_qualname" for sinfo in stack):
# We're calling outselves recursively, maybe because we're testing
# properties. Return an int to try to get back on track.
return 17
caller_frame = stack[0][0]
return qualname_from_frame(caller_frame)
class Parent(object): # pylint: disable=missing-docstring
def meth(self): # pylint: disable=missing-docstring
return get_qualname()
@property
def a_property(self): # pylint: disable=missing-docstring
return get_qualname()
class Child(Parent): # pylint: disable=missing-docstring
pass
class SomethingElse(object): # pylint: disable=missing-docstring
pass
class MultiChild(SomethingElse, Child): # pylint: disable=missing-docstring
pass
def no_arguments(): # pylint: disable=missing-docstring
return get_qualname()
def plain_old_function(a, b): # pylint: disable=missing-docstring, unused-argument
return get_qualname()
def fake_out(self): # pylint: disable=missing-docstring, unused-argument
return get_qualname()
def patch_meth(self): # pylint: disable=missing-docstring, unused-argument
return get_qualname()
class QualnameTest(CoverageTest):
"""Tests of qualname_from_frame."""
# Pylint gets confused about meth() below.
# pylint: disable=no-value-for-parameter
run_in_temp_dir = False
def test_method(self):
self.assertEqual(Parent().meth(), "Parent.meth")
def test_inherited_method(self):
self.assertEqual(Child().meth(), "Parent.meth")
def test_mi_inherited_method(self):
self.assertEqual(MultiChild().meth(), "Parent.meth")
def test_no_arguments(self):
self.assertEqual(no_arguments(), "no_arguments")
def test_plain_old_function(self):
self.assertEqual(plain_old_function(0, 1), "plain_old_function")
def test_fake_out(self):
self.assertEqual(fake_out(0), "fake_out")
def test_property(self):
# I'd like this to be "Parent.a_property", but this might be ok too.
self.assertEqual(Parent().a_property, "a_property")
def test_changeling(self):
c = Child()
c.meth = patch_meth
self.assertEqual(c.meth(c), "patch_meth")
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