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"""Tests for process behavior of coverage.py."""
import os, sys, textwrap
import coverage
sys.path.insert(0, os.path.split(__file__)[0]) # Force relative import for Py3k
from coveragetest import CoverageTest
class ProcessTest(CoverageTest):
"""Tests of the per-process behavior of coverage.py."""
def number_of_data_files(self):
"""Return the number of coverage data files in this directory."""
num = 0
for f in os.listdir('.'):
if f.startswith('.coverage.') or f == '.coverage':
num += 1
return num
def testSaveOnExit(self):
self.make_file("mycode.py", """\
h = "Hello"
w = "world"
""")
self.assertFalse(os.path.exists(".coverage"))
self.run_command("coverage -x mycode.py")
self.assertTrue(os.path.exists(".coverage"))
def testEnvironment(self):
# Checks that we can import modules from the test directory at all!
self.make_file("mycode.py", """\
import covmod1
import covmodzip1
a = 1
print ('done')
""")
self.assertFalse(os.path.exists(".coverage"))
out = self.run_command("coverage -x mycode.py")
self.assertTrue(os.path.exists(".coverage"))
self.assertEqual(out, 'done\n')
def testCombineParallelData(self):
self.make_file("b_or_c.py", """\
import sys
a = 1
if sys.argv[1] == 'b':
b = 1
else:
c = 1
d = 1
print ('done')
""")
out = self.run_command("coverage -x -p b_or_c.py b")
self.assertEqual(out, 'done\n')
self.assertFalse(os.path.exists(".coverage"))
out = self.run_command("coverage -x -p b_or_c.py c")
self.assertEqual(out, 'done\n')
self.assertFalse(os.path.exists(".coverage"))
# After two -p runs, there should be two .coverage.machine.123 files.
self.assertEqual(self.number_of_data_files(), 2)
# Combine the parallel coverage data files into .coverage .
self.run_command("coverage -c")
self.assertTrue(os.path.exists(".coverage"))
# After combining, there should be only the .coverage file.
self.assertEqual(self.number_of_data_files(), 1)
# Read the coverage file and see that b_or_c.py has all 7 lines
# executed.
data = coverage.CoverageData()
data.read_file(".coverage")
self.assertEqual(data.summary()['b_or_c.py'], 7)
def test_combine_with_rc(self):
self.make_file("b_or_c.py", """\
import sys
a = 1
if sys.argv[1] == 'b':
b = 1
else:
c = 1
d = 1
print ('done')
""")
self.make_file(".coveragerc", """\
[run]
parallel = true
""")
out = self.run_command("coverage run b_or_c.py b")
self.assertEqual(out, 'done\n')
self.assertFalse(os.path.exists(".coverage"))
out = self.run_command("coverage run b_or_c.py c")
self.assertEqual(out, 'done\n')
self.assertFalse(os.path.exists(".coverage"))
# After two runs, there should be two .coverage.machine.123 files.
self.assertEqual(self.number_of_data_files(), 2)
# Combine the parallel coverage data files into .coverage .
self.run_command("coverage combine")
self.assertTrue(os.path.exists(".coverage"))
self.assertTrue(os.path.exists(".coveragerc"))
# After combining, there should be only the .coverage file.
self.assertEqual(self.number_of_data_files(), 1)
# Read the coverage file and see that b_or_c.py has all 7 lines
# executed.
data = coverage.CoverageData()
data.read_file(".coverage")
self.assertEqual(data.summary()['b_or_c.py'], 7)
# Reporting should still work even with the .rc file
out = self.run_command("coverage report")
self.assertMultiLineEqual(out, textwrap.dedent("""\
Name Stmts Exec Cover
----------------------------
b_or_c 7 7 100%
"""))
def test_missing_source_file(self):
# Check what happens if the source is missing when reporting happens.
self.make_file("fleeting.py", """\
s = 'goodbye, cruel world!'
""")
self.run_command("coverage run fleeting.py")
os.remove("fleeting.py")
out = self.run_command("coverage html -d htmlcov")
self.assertRegexpMatches(out, "No source for code: '.*fleeting.py'")
self.assertFalse("Traceback" in out)
# It happens that the code paths are different for *.py and other
# files, so try again with no extension.
self.make_file("fleeting", """\
s = 'goodbye, cruel world!'
""")
self.run_command("coverage run fleeting")
os.remove("fleeting")
status, out = self.run_command_status("coverage html -d htmlcov", 1)
self.assertRegexpMatches(out, "No source for code: '.*fleeting'")
self.assertFalse("Traceback" in out)
self.assertEqual(status, 1)
def test_running_missing_file(self):
status, out = self.run_command_status("coverage run xyzzy.py", 1)
self.assertRegexpMatches(out, "No file to run: .*xyzzy.py")
self.assertFalse("Traceback" in out)
self.assertEqual(status, 1)
def test_code_throws(self):
self.make_file("throw.py", """\
def f1():
raise Exception("hey!")
def f2():
f1()
f2()
""")
# The important thing is for "coverage run" and "python" to report the
# same traceback.
status, out = self.run_command_status("coverage run throw.py", 1)
out2 = self.run_command("python throw.py")
self.assertMultiLineEqual(out, out2)
# But also make sure that the output is what we expect.
self.assertTrue('File "throw.py", line 5, in f2' in out)
self.assertTrue('raise Exception("hey!")' in out)
self.assertFalse('coverage' in out)
self.assertEqual(status, 1)
def test_code_exits(self):
self.make_file("exit.py", """\
import sys
def f1():
print("about to exit..")
sys.exit(17)
def f2():
f1()
f2()
""")
# The important thing is for "coverage run" and "python" to have the
# same output. No traceback.
status, out = self.run_command_status("coverage run exit.py", 17)
status2, out2 = self.run_command_status("python exit.py", 17)
self.assertMultiLineEqual(out, out2)
self.assertMultiLineEqual(out, "about to exit..\n")
self.assertEqual(status, status2)
self.assertEqual(status, 17)
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