coverage.py / tests / test_process.py

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"""Tests for process behavior of coverage.py."""

import glob, os, sys, textwrap
from nose.plugins.skip import SkipTest
import coverage

from tests.coveragetest import CoverageTest

here = os.path.dirname(__file__)

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 test_save_on_exit(self):
        self.make_file("mycode.py", """\
            h = "Hello"
            w = "world"
            """)

        self.assert_doesnt_exist(".coverage")
        self.run_command("coverage -x mycode.py")
        self.assert_exists(".coverage")

    def test_environment(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.assert_doesnt_exist(".coverage")
        out = self.run_command("coverage -x mycode.py")
        self.assert_exists(".coverage")
        self.assertEqual(out, 'done\n')

    def test_combine_parallel_data(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.assert_doesnt_exist(".coverage")

        out = self.run_command("coverage -x -p b_or_c.py c")
        self.assertEqual(out, 'done\n')
        self.assert_doesnt_exist(".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.assert_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_parallel_data_in_two_steps(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.assert_doesnt_exist(".coverage")
        self.assertEqual(self.number_of_data_files(), 1)

        # Combine the (one) parallel coverage data file into .coverage .
        self.run_command("coverage -c")
        self.assert_exists(".coverage")
        self.assertEqual(self.number_of_data_files(), 1)

        out = self.run_command("coverage -x -p b_or_c.py c")
        self.assertEqual(out, 'done\n')
        self.assert_exists(".coverage")
        self.assertEqual(self.number_of_data_files(), 2)

        # Combine the parallel coverage data files into .coverage .
        self.run_command("coverage -c")
        self.assert_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.assert_doesnt_exist(".coverage")

        out = self.run_command("coverage run b_or_c.py c")
        self.assertEqual(out, 'done\n')
        self.assert_doesnt_exist(".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.assert_exists(".coverage")
        self.assert_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   Miss  Cover
            ----------------------------
            b_or_c       7      0   100%
            """))

    def test_combine_with_aliases(self):
        self.make_file("d1/x.py", """\
            a = 1
            b = 2
            print("%s %s" % (a, b))
            """)

        self.make_file("d2/x.py", """\
            # 1
            # 2
            # 3
            c = 4
            d = 5
            print("%s %s" % (c, d))
            """)

        self.make_file(".coveragerc", """\
            [run]
            parallel = True

            [paths]
            source =
                src
                */d1
                */d2
            """)

        out = self.run_command("coverage run " + os.path.normpath("d1/x.py"))
        self.assertEqual(out, '1 2\n')
        out = self.run_command("coverage run " + os.path.normpath("d2/x.py"))
        self.assertEqual(out, '4 5\n')

        self.assertEqual(self.number_of_data_files(), 2)

        self.run_command("coverage combine")
        self.assert_exists(".coverage")

        # After combining, there should be only the .coverage file.
        self.assertEqual(self.number_of_data_files(), 1)

        # Read the coverage data file and see that the two different x.py
        # files have been combined together.
        data = coverage.CoverageData()
        data.read_file(".coverage")
        summary = data.summary(fullpath=True)
        self.assertEqual(len(summary), 1)
        actual = os.path.normcase(os.path.abspath(list(summary.keys())[0]))
        expected = os.path.normcase(os.path.abspath('src/x.py'))
        self.assertEqual(actual, expected)
        self.assertEqual(list(summary.values())[0], 6)

    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.assertNotIn("Traceback", 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.assertNotIn("Traceback", 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.assertNotIn("raceback", out)
        self.assertNotIn("rror", 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")
        if '__pypy__' in sys.builtin_module_names:
            # Pypy has an extra frame in the traceback for some reason
            lines2 = out2.splitlines()
            out2 = "".join(l+"\n" for l in lines2 if "toplevel" not in l)
        self.assertMultiLineEqual(out, out2)

        # But also make sure that the output is what we expect.
        self.assertIn('File "throw.py", line 5, in f2', out)
        self.assertIn('raise Exception("hey!")', out)
        self.assertNotIn('coverage', 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)

    def test_code_exits_no_arg(self):
        self.make_file("exit_none.py", """\
            import sys
            def f1():
                print("about to exit quietly..")
                sys.exit()

            f1()
            """)
        status, out = self.run_command_status("coverage run exit_none.py", 0)
        status2, out2 = self.run_command_status("python exit_none.py", 0)
        self.assertMultiLineEqual(out, out2)
        self.assertMultiLineEqual(out, "about to exit quietly..\n")
        self.assertEqual(status, status2)
        self.assertEqual(status, 0)

    def test_coverage_run_is_like_python(self):
        tryfile = os.path.join(here, "try_execfile.py")
        self.make_file("run_me.py", open(tryfile).read())
        out_cov = self.run_command("coverage run run_me.py")
        out_py = self.run_command("python run_me.py")
        self.assertMultiLineEqual(out_cov, out_py)

    def test_coverage_run_dashm_is_like_python_dashm(self):
        # These -m commands assume the coverage tree is on the path.
        out_cov = self.run_command("coverage run -m tests.try_execfile")
        out_py = self.run_command("python -m tests.try_execfile")
        self.assertMultiLineEqual(out_cov, out_py)

    def test_coverage_run_dashm_is_like_python_dashm_off_path(self):
        # https://bitbucket.org/ned/coveragepy/issue/242
        tryfile = os.path.join(here, "try_execfile.py")
        self.make_file("sub/__init__.py", "")
        self.make_file("sub/run_me.py", open(tryfile).read())
        out_cov = self.run_command("coverage run -m sub.run_me")
        out_py = self.run_command("python -m sub.run_me")
        self.assertMultiLineEqual(out_cov, out_py)

    if sys.version_info >= (2, 7):
        # Coverage isn't bug-for-bug compatible in the behavior of -m for
        # Pythons < 2.7
        def test_coverage_run_dashm_is_like_python_dashm_with__main__207(self):
            # https://bitbucket.org/ned/coveragepy/issue/207
            self.make_file("package/__init__.py", "print('init')")
            self.make_file("package/__main__.py", "print('main')")
            out_cov = self.run_command("coverage run -m package")
            out_py = self.run_command("python -m package")
            self.assertMultiLineEqual(out_cov, out_py)

    if hasattr(os, 'fork'):
        def test_fork(self):
            self.make_file("fork.py", """\
                import os

                def child():
                    print('Child!')

                def main():
                    ret = os.fork()

                    if ret == 0:
                        child()
                    else:
                        os.waitpid(ret, 0)

                main()
                """)

            out = self.run_command("coverage run -p fork.py")
            self.assertEqual(out, 'Child!\n')
            self.assert_doesnt_exist(".coverage")

            # After running the forking program, 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.assert_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()['fork.py'], 9)

    def test_warnings(self):
        self.make_file("hello.py", """\
            import sys, os
            print("Hello")
            """)
        out = self.run_command("coverage run --source=sys,xyzzy,quux hello.py")

        self.assertIn("Hello\n", out)
        self.assertIn(textwrap.dedent("""\
            Coverage.py warning: Module sys has no Python source.
            Coverage.py warning: Module xyzzy was never imported.
            Coverage.py warning: Module quux was never imported.
            Coverage.py warning: No data was collected.
            """), out)

    def test_warnings_during_reporting(self):
        # While fixing issue #224, the warnings were being printed far too
        # often.  Make sure they're not any more.
        self.make_file("hello.py", """\
            import sys, os, the_other
            print("Hello")
            """)
        self.make_file("the_other.py", """\
            print("What?")
            """)
        self.make_file(".coveragerc", """\
            [run]
            source =
                .
                xyzzy
            """)

        self.run_command("coverage run hello.py")
        out = self.run_command("coverage html")
        self.assertEqual(out.count("Module xyzzy was never imported."), 0)

    def test_warnings_if_never_run(self):
        out = self.run_command("coverage run i_dont_exist.py")
        self.assertIn("No file to run: 'i_dont_exist.py'", out)
        self.assertNotIn("warning", out)
        self.assertNotIn("Exception", out)

        out = self.run_command("coverage run -m no_such_module")
        self.assertTrue(
            ("No module named no_such_module" in out) or
            ("No module named 'no_such_module'" in out)
            )
        self.assertNotIn("warning", out)
        self.assertNotIn("Exception", out)

    def test_warnings_trace_function_changed_with_threads(self):
        # https://bitbucket.org/ned/coveragepy/issue/164
        self.make_file("bug164.py", """\
            import threading
            import time

            class MyThread (threading.Thread):
                def run(self):
                    print("Hello")

            thr = MyThread()
            thr.start()
            thr.join()
            """)
        out = self.run_command("coverage run --timid bug164.py")

        self.assertIn("Hello\n", out)
        self.assertNotIn("warning", out)

    def test_warning_trace_function_changed(self):
        self.make_file("settrace.py", """\
            import sys
            print("Hello")
            sys.settrace(None)
            print("Goodbye")
            """)
        out = self.run_command("coverage run --timid settrace.py")
        self.assertIn("Hello\n", out)
        self.assertIn("Goodbye\n", out)

        if hasattr(sys, "gettrace"):
            self.assertIn("Trace function changed", out)

    if sys.version_info >= (3, 0):   # This only works on 3.x for now.
        # It only works with the C tracer,
        c_tracer = os.getenv('COVERAGE_TEST_TRACER', 'c') == 'c'
        # and if we aren't measuring ourselves.
        metacov = os.getenv('COVERAGE_COVERAGE', '') != ''
        if c_tracer and not metacov:        # pragma: not covered
            def test_fullcoverage(self):
                # fullcoverage is a trick to get stdlib modules measured from
                # the very beginning of the process. Here we import os and
                # then check how many lines are measured.
                self.make_file("getenv.py", """\
                    import os
                    print("FOOEY == %s" % os.getenv("FOOEY"))
                    """)

                fullcov = os.path.join(
                    os.path.dirname(coverage.__file__), "fullcoverage"
                    )
                self.set_environ("FOOEY", "BOO")
                self.set_environ("PYTHONPATH", fullcov)
                out = self.run_command("python -m coverage run -L getenv.py")
                self.assertEqual(out, "FOOEY == BOO\n")
                data = coverage.CoverageData()
                data.read_file(".coverage")
                # The actual number of executed lines in os.py when it's
                # imported is 120 or so.  Just running os.getenv executes
                # about 5.
                self.assertGreater(data.summary()['os.py'], 50)


class AliasedCommandTest(CoverageTest):
    """Tests of the version-specific command aliases."""

    run_in_temp_dir = False

    def test_major_version_works(self):
        # "coverage2" works on py2
        cmd = "coverage%d" % sys.version_info[0]
        out = self.run_command(cmd)
        self.assertIn("Code coverage for Python", out)

    def test_wrong_alias_doesnt_work(self):
        # "coverage3" doesn't work on py2
        badcmd = "coverage%d" % (5 - sys.version_info[0])
        out = self.run_command(badcmd)
        self.assertNotIn("Code coverage for Python", out)

    def test_specific_alias_works(self):
        # "coverage-2.7" works on py2.7
        cmd = "coverage-%d.%d" % sys.version_info[:2]
        out = self.run_command(cmd)
        self.assertIn("Code coverage for Python", out)


class PydocTest(CoverageTest):
    """Test that pydoc can get our information."""

    run_in_temp_dir = False

    def assert_pydoc_ok(self, name, thing):
        """Check that pydoc of `name` finds the docstring from `thing`."""
        # Run pydoc.
        out = self.run_command("python -m pydoc " + name)
        # It should say "Help on..", and not have a traceback
        self.assert_starts_with(out, "Help on ")
        self.assertNotIn("Traceback", out)

        # All of the lines in the docstring should be there somewhere.
        for line in thing.__doc__.splitlines():
            self.assertIn(line.strip(), out)

    def test_pydoc_coverage(self):
        self.assert_pydoc_ok("coverage", coverage)

    def test_pydoc_coverage_coverage(self):
        self.assert_pydoc_ok("coverage.coverage", coverage.coverage)


class FailUnderTest(CoverageTest):
    """Tests of the --fail-under switch."""

    def setUp(self):
        super(FailUnderTest, self).setUp()
        self.make_file("fifty.py", """\
            # I have 50% coverage!
            a = 1
            if a > 2:
                b = 3
                c = 4
            """)
        st, _ = self.run_command_status("coverage run fifty.py", 0)
        self.assertEqual(st, 0)

    def test_report(self):
        st, _ = self.run_command_status("coverage report --fail-under=50", 0)
        self.assertEqual(st, 0)
        st, _ = self.run_command_status("coverage report --fail-under=51", 2)
        self.assertEqual(st, 2)

    def test_html_report(self):
        st, _ = self.run_command_status("coverage html --fail-under=50", 0)
        self.assertEqual(st, 0)
        st, _ = self.run_command_status("coverage html --fail-under=51", 2)
        self.assertEqual(st, 2)

    def test_xml_report(self):
        st, _ = self.run_command_status("coverage xml --fail-under=50", 0)
        self.assertEqual(st, 0)
        st, _ = self.run_command_status("coverage xml --fail-under=51", 2)
        self.assertEqual(st, 2)


class ProcessStartupTest(CoverageTest):
    """Test that we can measure coverage in subprocesses."""

    def setUp(self):
        super(ProcessStartupTest, self).setUp()
        # Find a place to put a .pth file.
        pth_contents = "import coverage; coverage.process_startup()\n"
        for d in sys.path:                          # pragma: part covered
            g = glob.glob(os.path.join(d, "*.pth"))
            if g:
                pth_path = os.path.join(d, "subcover.pth")
                with open(pth_path, "w") as pth:
                    try:
                        pth.write(pth_contents)
                        self.pth_path = pth_path
                        break
                    except (IOError, OSError):          # pragma: not covered
                        pass
        else:                                           # pragma: not covered
            raise Exception("Couldn't find a place for the .pth file")

    def tearDown(self):
        super(ProcessStartupTest, self).tearDown()
        # Clean up the .pth file we made.
        os.remove(self.pth_path)

    def test_subprocess_with_pth_files(self):           # pragma: not covered
        if os.environ.get('COVERAGE_COVERAGE', ''):
            raise SkipTest(
                "Can't test subprocess pth file suppport during metacoverage"
                )

        # Main will run sub.py
        self.make_file("main.py", """\
            import os, os.path, sys
            ex = os.path.basename(sys.executable)
            os.system(ex + " sub.py")
            """)
        # sub.py will write a few lines.
        self.make_file("sub.py", """\
            f = open("out.txt", "w")
            f.write("Hello, world!\\n")
            f.close()
            """)
        self.make_file("coverage.ini", """\
            [run]
            data_file = .mycovdata
            """)
        self.set_environ("COVERAGE_PROCESS_START", "coverage.ini")
        import main             # pylint: disable=F0401,W0612

        self.assertEqual(open("out.txt").read(), "Hello, world!\n")

        # Read the data from .coverage
        self.assert_exists(".mycovdata")
        data = coverage.CoverageData()
        data.read_file(".mycovdata")
        self.assertEqual(data.summary()['sub.py'], 3)
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