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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
"""Test LCOV-based summary reporting for coverage.py."""
from __future__ import annotations
import math
import textwrap
from tests.coveragetest import CoverageTest
import coverage
from coverage import env
class LcovTest(CoverageTest):
"""Tests of the LCOV reports from coverage.py."""
def create_initial_files(self) -> None:
"""
Helper for tests that handles the common ceremony so the tests can
show the consequences of changes in the setup.
"""
self.make_file("main_file.py", """\
#!/usr/bin/env python3
def cuboid_volume(l):
return (l*l*l)
def IsItTrue():
return True
""")
self.make_file("test_file.py", """\
#!/usr/bin/env python3
from main_file import cuboid_volume
import unittest
class TestCuboid(unittest.TestCase):
def test_volume(self):
self.assertAlmostEqual(cuboid_volume(2),8)
self.assertAlmostEqual(cuboid_volume(1),1)
self.assertAlmostEqual(cuboid_volume(0),0)
self.assertAlmostEqual(cuboid_volume(5.5),166.375)
""")
def get_lcov_report_content(self, filename: str = "coverage.lcov") -> str:
"""Return the content of an LCOV report."""
with open(filename, "r") as file:
return file.read()
def test_lone_file(self) -> None:
# For a single file with a couple of functions, the lcov should cover
# the function definitions themselves, but not the returns.
self.make_file("main_file.py", """\
#!/usr/bin/env python3
def cuboid_volume(l):
return (l*l*l)
def IsItTrue():
return True
""")
expected_result = textwrap.dedent("""\
TN:
SF:main_file.py
DA:3,1,7URou3io0zReBkk69lEb/Q
DA:6,1,ilhb4KUfytxtEuClijZPlQ
DA:4,0,Xqj6H1iz/nsARMCAbE90ng
DA:7,0,LWILTcvARcydjFFyo9qM0A
LF:4
LH:2
end_of_record
""")
self.assert_doesnt_exist(".coverage")
cov = coverage.Coverage(source=["."])
self.start_import_stop(cov, "main_file")
pct = cov.lcov_report()
assert pct == 50.0
actual_result = self.get_lcov_report_content()
assert expected_result == actual_result
def test_simple_line_coverage_two_files(self) -> None:
# Test that line coverage is created when coverage is run,
# and matches the output of the file below.
self.create_initial_files()
self.assert_doesnt_exist(".coverage")
self.make_file(".coveragerc", "[lcov]\noutput = data.lcov\n")
cov = coverage.Coverage(source=".")
self.start_import_stop(cov, "test_file")
pct = cov.lcov_report()
assert pct == 50.0
self.assert_exists("data.lcov")
expected_result = textwrap.dedent("""\
TN:
SF:main_file.py
DA:3,1,7URou3io0zReBkk69lEb/Q
DA:6,1,ilhb4KUfytxtEuClijZPlQ
DA:4,0,Xqj6H1iz/nsARMCAbE90ng
DA:7,0,LWILTcvARcydjFFyo9qM0A
LF:4
LH:2
end_of_record
TN:
SF:test_file.py
DA:3,1,R5Rb4IzmjKRgY/vFFc1TRg
DA:4,1,E/tvV9JPVDhEcTCkgrwOFw
DA:6,1,GP08LPBYJq8EzYveHJy2qA
DA:7,1,MV+jSLi6PFEl+WatEAptog
DA:8,0,qyqd1mF289dg6oQAQHA+gQ
DA:9,0,nmEYd5F1KrxemgC9iVjlqg
DA:10,0,jodMK26WYDizOO1C7ekBbg
DA:11,0,LtxfKehkX8o4KvC5GnN52g
LF:8
LH:4
end_of_record
""")
actual_result = self.get_lcov_report_content(filename="data.lcov")
assert expected_result == actual_result
def test_branch_coverage_one_file(self) -> None:
# Test that the reporter produces valid branch coverage.
self.make_file("main_file.py", """\
#!/usr/bin/env python3
def is_it_x(x):
if x == 3:
return x
else:
return False
""")
self.assert_doesnt_exist(".coverage")
cov = coverage.Coverage(branch=True, source=".")
self.start_import_stop(cov, "main_file")
pct = cov.lcov_report()
assert math.isclose(pct, 16.666666666666668)
self.assert_exists("coverage.lcov")
expected_result = textwrap.dedent("""\
TN:
SF:main_file.py
DA:3,1,4MDXMbvwQ3L7va1tsphVzw
DA:4,0,MuERA6EYyZNpKPqoJfzwkA
DA:5,0,sAyiiE6iAuPMte9kyd0+3g
DA:7,0,W/g8GJDAYJkSSurt59Mzfw
LF:4
LH:1
BRDA:5,0,0,-
BRDA:7,0,1,-
BRF:2
BRH:0
end_of_record
""")
actual_result = self.get_lcov_report_content()
assert expected_result == actual_result
def test_branch_coverage_two_files(self) -> None:
# Test that valid branch coverage is generated
# in the case of two files.
self.make_file("main_file.py", """\
#!/usr/bin/env python3
def is_it_x(x):
if x == 3:
return x
else:
return False
""")
self.make_file("test_file.py", """\
#!/usr/bin/env python3
from main_file import *
import unittest
class TestIsItX(unittest.TestCase):
def test_is_it_x(self):
self.assertEqual(is_it_x(3), 3)
self.assertEqual(is_it_x(4), False)
""")
self.assert_doesnt_exist(".coverage")
cov = coverage.Coverage(branch=True, source=".")
self.start_import_stop(cov, "test_file")
pct = cov.lcov_report()
assert math.isclose(pct, 41.666666666666664)
self.assert_exists("coverage.lcov")
expected_result = textwrap.dedent("""\
TN:
SF:main_file.py
DA:3,1,4MDXMbvwQ3L7va1tsphVzw
DA:4,0,MuERA6EYyZNpKPqoJfzwkA
DA:5,0,sAyiiE6iAuPMte9kyd0+3g
DA:7,0,W/g8GJDAYJkSSurt59Mzfw
LF:4
LH:1
BRDA:5,0,0,-
BRDA:7,0,1,-
BRF:2
BRH:0
end_of_record
TN:
SF:test_file.py
DA:3,1,9TxKIyoBtmhopmlbDNa8FQ
DA:4,1,E/tvV9JPVDhEcTCkgrwOFw
DA:6,1,C3s/c8C1Yd/zoNG1GnGexg
DA:7,1,9qPyWexYysgeKtB+YvuzAg
DA:8,0,LycuNcdqoUhPXeuXUTf5lA
DA:9,0,FPTWzd68bDx76HN7VHu1wA
LF:6
LH:4
BRF:0
BRH:0
end_of_record
""")
actual_result = self.get_lcov_report_content()
assert actual_result == expected_result
def test_half_covered_branch(self) -> None:
# Test that for a given branch that is only half covered,
# the block numbers remain the same, and produces valid lcov.
self.make_file("main_file.py", """\
something = True
if something:
print("Yes, something")
else:
print("No, nothing")
""")
self.assert_doesnt_exist(".coverage")
cov = coverage.Coverage(branch=True, source=".")
self.start_import_stop(cov, "main_file")
pct = cov.lcov_report()
assert math.isclose(pct, 66.66666666666667)
self.assert_exists("coverage.lcov")
expected_result = textwrap.dedent("""\
TN:
SF:main_file.py
DA:1,1,N4kbVOlkNI1rqOfCArBClw
DA:3,1,CmlqqPf0/H+R/p7/PLEXZw
DA:4,1,rE3mWnpoMq2W2sMETVk/uQ
DA:6,0,+Aov7ekIts7C96udNDVIIQ
LF:4
LH:3
BRDA:6,0,0,-
BRDA:4,0,1,1
BRF:2
BRH:1
end_of_record
""")
actual_result = self.get_lcov_report_content()
assert actual_result == expected_result
def test_empty_init_files(self) -> None:
# Test that in the case of an empty __init__.py file, the lcov
# reporter will note that the file is there, and will note the empty
# line. It will also note the lack of branches, and the checksum for
# the line.
#
# Although there are no lines found, it will note one line as hit in
# old Pythons, and no lines hit in newer Pythons.
self.make_file("__init__.py", "")
self.assert_doesnt_exist(".coverage")
cov = coverage.Coverage(branch=True, source=".")
self.start_import_stop(cov, "__init__")
pct = cov.lcov_report()
assert pct == 0.0
self.assert_exists("coverage.lcov")
# Newer Pythons have truly empty empty files.
if env.PYBEHAVIOR.empty_is_empty:
expected_result = textwrap.dedent("""\
TN:
SF:__init__.py
LF:0
LH:0
BRF:0
BRH:0
end_of_record
""")
else:
expected_result = textwrap.dedent("""\
TN:
SF:__init__.py
DA:1,1,1B2M2Y8AsgTpgAmY7PhCfg
LF:0
LH:0
BRF:0
BRH:0
end_of_record
""")
actual_result = self.get_lcov_report_content()
assert actual_result == expected_result
|
