text: # 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 coverage.py's API."""
  
  import fnmatch
  import glob
  import io
  import os
  import os.path
  import re
  import shutil
  import sys
  import textwrap
  
  import pytest
  
  import coverage
  from coverage import env
  from coverage.data import line_counts
  from coverage.exceptions import CoverageException
  from coverage.files import abs_file, relative_filename
  from coverage.misc import import_local_file
  
  from tests.coveragetest import CoverageTest, TESTS_DIR, UsingModulesMixin
  from tests.helpers import assert_count_equal, assert_coverage_warnings, change_dir, nice_file
  
  
  class ApiTest(CoverageTest):
      """Api-oriented tests for coverage.py."""
  
      def clean_files(self, files, pats):
          """Remove names matching `pats` from `files`, a list of file names."""
          good = []
          for f in files:
              for pat in pats:
                  if fnmatch.fnmatch(f, pat):
                      break
              else:
                  good.append(f)
          return good
  
      def assertFiles(self, files):
          """Assert that the files here are `files`, ignoring the usual junk."""
          here = os.listdir(".")
          here = self.clean_files(here, ["*.pyc", "__pycache__", "*$py.class"])
          assert_count_equal(here, files)
  
      def test_unexecuted_file(self):
          cov = coverage.Coverage()
  
          self.make_file("mycode.py", """\
              a = 1
              b = 2
              if b == 3:
                  c = 4
              d = 5
              """)
  
          self.make_file("not_run.py", """\
              fooey = 17
              """)
  
          # Import the Python file, executing it.
          self.start_import_stop(cov, "mycode")
  
          _, statements, missing, _ = cov.analysis("not_run.py")
          assert statements == [1]
          assert missing == [1]
  
      def test_filenames(self):
  
          self.make_file("mymain.py", """\
              import mymod
              a = 1
              """)
  
          self.make_file("mymod.py", """\
              fooey = 17
              """)
  
          # Import the Python file, executing it.
          cov = coverage.Coverage()
          self.start_import_stop(cov, "mymain")
  
          filename, _, _, _ = cov.analysis("mymain.py")
          assert os.path.basename(filename) == "mymain.py"
          filename, _, _, _ = cov.analysis("mymod.py")
          assert os.path.basename(filename) == "mymod.py"
  
          filename, _, _, _ = cov.analysis(sys.modules["mymain"])
          assert os.path.basename(filename) == "mymain.py"
          filename, _, _, _ = cov.analysis(sys.modules["mymod"])
          assert os.path.basename(filename) == "mymod.py"
  
          # Import the Python file, executing it again, once it's been compiled
          # already.
          cov = coverage.Coverage()
          self.start_import_stop(cov, "mymain")
  
          filename, _, _, _ = cov.analysis("mymain.py")
          assert os.path.basename(filename) == "mymain.py"
          filename, _, _, _ = cov.analysis("mymod.py")
          assert os.path.basename(filename) == "mymod.py"
  
          filename, _, _, _ = cov.analysis(sys.modules["mymain"])
          assert os.path.basename(filename) == "mymain.py"
          filename, _, _, _ = cov.analysis(sys.modules["mymod"])
          assert os.path.basename(filename) == "mymod.py"
  
      def test_ignore_stdlib(self):
          self.make_file("mymain.py", """\
              import colorsys
              a = 1
              hls = colorsys.rgb_to_hls(1.0, 0.5, 0.0)
              """)
  
          # Measure without the stdlib.
          cov1 = coverage.Coverage()
          assert cov1.config.cover_pylib is False
          self.start_import_stop(cov1, "mymain")
  
          # some statements were marked executed in mymain.py
          _, statements, missing, _ = cov1.analysis("mymain.py")
          assert statements != missing
          # but none were in colorsys.py
          _, statements, missing, _ = cov1.analysis("colorsys.py")
          assert statements == missing
  
          # Measure with the stdlib.
          cov2 = coverage.Coverage(cover_pylib=True)
          self.start_import_stop(cov2, "mymain")
  
          # some statements were marked executed in mymain.py
          _, statements, missing, _ = cov2.analysis("mymain.py")
          assert statements != missing
          # and some were marked executed in colorsys.py
          _, statements, missing, _ = cov2.analysis("colorsys.py")
          assert statements != missing
  
      def test_include_can_measure_stdlib(self):
          self.make_file("mymain.py", """\
              import colorsys, random
              a = 1
              r, g, b = [random.random() for _ in range(3)]
              hls = colorsys.rgb_to_hls(r, g, b)
              """)
  
          # Measure without the stdlib, but include colorsys.
          cov1 = coverage.Coverage(cover_pylib=False, include=["*/colorsys.py"])
          self.start_import_stop(cov1, "mymain")
  
          # some statements were marked executed in colorsys.py
          _, statements, missing, _ = cov1.analysis("colorsys.py")
          assert statements != missing
          # but none were in random.py
          _, statements, missing, _ = cov1.analysis("random.py")
          assert statements == missing
  
      def test_exclude_list(self):
          cov = coverage.Coverage()
          cov.clear_exclude()
          assert cov.get_exclude_list() == []
          cov.exclude("foo")
          assert cov.get_exclude_list() == ["foo"]
          cov.exclude("bar")
          assert cov.get_exclude_list() == ["foo", "bar"]
          assert cov._exclude_regex('exclude') == "(?:foo)|(?:bar)"
          cov.clear_exclude()
          assert cov.get_exclude_list() == []
  
      def test_exclude_partial_list(self):
          cov = coverage.Coverage()
          cov.clear_exclude(which='partial')
          assert cov.get_exclude_list(which='partial') == []
          cov.exclude("foo", which='partial')
          assert cov.get_exclude_list(which='partial') == ["foo"]
          cov.exclude("bar", which='partial')
          assert cov.get_exclude_list(which='partial') == ["foo", "bar"]
          assert cov._exclude_regex(which='partial') == "(?:foo)|(?:bar)"
          cov.clear_exclude(which='partial')
          assert cov.get_exclude_list(which='partial') == []
  
      def test_exclude_and_partial_are_separate_lists(self):
          cov = coverage.Coverage()
          cov.clear_exclude(which='partial')
          cov.clear_exclude(which='exclude')
          cov.exclude("foo", which='partial')
          assert cov.get_exclude_list(which='partial') == ['foo']
          assert cov.get_exclude_list(which='exclude') == []
          cov.exclude("bar", which='exclude')
          assert cov.get_exclude_list(which='partial') == ['foo']
          assert cov.get_exclude_list(which='exclude') == ['bar']
          cov.exclude("p2", which='partial')
          cov.exclude("e2", which='exclude')
          assert cov.get_exclude_list(which='partial') == ['foo', 'p2']
          assert cov.get_exclude_list(which='exclude') == ['bar', 'e2']
          cov.clear_exclude(which='partial')
          assert cov.get_exclude_list(which='partial') == []
          assert cov.get_exclude_list(which='exclude') == ['bar', 'e2']
          cov.clear_exclude(which='exclude')
          assert cov.get_exclude_list(which='partial') == []
          assert cov.get_exclude_list(which='exclude') == []
  
      def test_datafile_default(self):
          # Default data file behavior: it's .coverage
          self.make_file("datatest1.py", """\
              fooey = 17
              """)
  
          self.assertFiles(["datatest1.py"])
          cov = coverage.Coverage()
          self.start_import_stop(cov, "datatest1")
          cov.save()
          self.assertFiles(["datatest1.py", ".coverage"])
  
      def test_datafile_specified(self):
          # You can specify the data file name.
          self.make_file("datatest2.py", """\
              fooey = 17
              """)
  
          self.assertFiles(["datatest2.py"])
          cov = coverage.Coverage(data_file="cov.data")
          self.start_import_stop(cov, "datatest2")
          cov.save()
          self.assertFiles(["datatest2.py", "cov.data"])
  
      def test_datafile_and_suffix_specified(self):
          # You can specify the data file name and suffix.
          self.make_file("datatest3.py", """\
              fooey = 17
              """)
  
          self.assertFiles(["datatest3.py"])
          cov = coverage.Coverage(data_file="cov.data", data_suffix="14")
          self.start_import_stop(cov, "datatest3")
          cov.save()
          self.assertFiles(["datatest3.py", "cov.data.14"])
  
      def test_datafile_from_rcfile(self):
          # You can specify the data file name in the .coveragerc file
          self.make_file("datatest4.py", """\
              fooey = 17
              """)
          self.make_file(".coveragerc", """\
              [run]
              data_file = mydata.dat
              """)
  
          self.assertFiles(["datatest4.py", ".coveragerc"])
          cov = coverage.Coverage()
          self.start_import_stop(cov, "datatest4")
          cov.save()
          self.assertFiles(["datatest4.py", ".coveragerc", "mydata.dat"])
  
      def test_deep_datafile(self):
          self.make_file("datatest5.py", "fooey = 17")
          self.assertFiles(["datatest5.py"])
          cov = coverage.Coverage(data_file="deep/sub/cov.data")
          self.start_import_stop(cov, "datatest5")
          cov.save()
          self.assertFiles(["datatest5.py", "deep"])
          self.assert_exists("deep/sub/cov.data")
  
      def test_datafile_none(self):
          cov = coverage.Coverage(data_file=None)
  
          def f1():       # pragma: nested
              a = 1       # pylint: disable=unused-variable
  
          one_line_number = f1.__code__.co_firstlineno + 1
          lines = []
  
          def run_one_function(f):
              cov.erase()
              cov.start()
              f()
              cov.stop()
  
              fs = cov.get_data().measured_files()
              lines.append(cov.get_data().lines(list(fs)[0]))
  
          run_one_function(f1)
          run_one_function(f1)
          run_one_function(f1)
          assert lines == [[one_line_number]] * 3
          self.assert_doesnt_exist(".coverage")
          assert os.listdir(".") == []
  
      def test_empty_reporting(self):
          # empty summary reports raise exception, just like the xml report
          cov = coverage.Coverage()
          cov.erase()
          with pytest.raises(CoverageException, match="No data to report."):
              cov.report()
  
      def test_completely_zero_reporting(self):
          # https://github.com/nedbat/coveragepy/issues/884
          # If nothing was measured, the file-touching didn't happen properly.
          self.make_file("foo/bar.py", "print('Never run')")
          self.make_file("test.py", "assert True")
          with pytest.warns(Warning) as warns:
              cov = coverage.Coverage(source=["foo"])
              self.start_import_stop(cov, "test")
              cov.report()
          assert_coverage_warnings(warns, "No data was collected. (no-data-collected)")
          # Name         Stmts   Miss  Cover
          # --------------------------------
          # foo/bar.py       1      1     0%
          # --------------------------------
          # TOTAL            1      1     0%
  
          last = self.last_line_squeezed(self.stdout())
          assert "TOTAL 1 1 0%" == last
  
      def test_cov4_data_file(self):
          cov4_data = (
              "!coverage.py: This is a private format, don't read it directly!"
              '{"lines":{"/private/tmp/foo.py":[1,5,2,3]}}'
          )
          self.make_file(".coverage", cov4_data)
          cov = coverage.Coverage()
          with pytest.raises(CoverageException, match="Looks like a coverage 4.x data file"):
              cov.load()
          cov.erase()
  
      def make_code1_code2(self):
          """Create the code1.py and code2.py files."""
          self.make_file("code1.py", """\
              code1 = 1
              """)
          self.make_file("code2.py", """\
              code2 = 1
              code2 = 2
              """)
  
      def check_code1_code2(self, cov):
          """Check the analysis is correct for code1.py and code2.py."""
          _, statements, missing, _ = cov.analysis("code1.py")
          assert statements == [1]
          assert missing == []
          _, statements, missing, _ = cov.analysis("code2.py")
          assert statements == [1, 2]
          assert missing == []
  
      def test_start_stop_start_stop(self):
          self.make_code1_code2()
          cov = coverage.Coverage()
          self.start_import_stop(cov, "code1")
          cov.save()
          self.start_import_stop(cov, "code2")
          self.check_code1_code2(cov)
  
      def test_start_save_stop(self):
          self.make_code1_code2()
          cov = coverage.Coverage()
          cov.start()
          import_local_file("code1")                                     # pragma: nested
          cov.save()                                                     # pragma: nested
          import_local_file("code2")                                     # pragma: nested
          cov.stop()                                                     # pragma: nested
          self.check_code1_code2(cov)
  
      def test_start_save_nostop(self):
          self.make_code1_code2()
          cov = coverage.Coverage()
          cov.start()
          import_local_file("code1")                                     # pragma: nested
          cov.save()                                                     # pragma: nested
          import_local_file("code2")                                     # pragma: nested
          self.check_code1_code2(cov)                                    # pragma: nested
          # Then stop it, or the test suite gets out of whack.
          cov.stop()                                                     # pragma: nested
  
      def test_two_getdata_only_warn_once(self):
          self.make_code1_code2()
          cov = coverage.Coverage(source=["."], omit=["code1.py"])
          cov.start()
          import_local_file("code1")                                     # pragma: nested
          cov.stop()                                                     # pragma: nested
          # We didn't collect any data, so we should get a warning.
          with self.assert_warnings(cov, ["No data was collected"]):
              cov.get_data()
          # But calling get_data a second time with no intervening activity
          # won't make another warning.
          with self.assert_warnings(cov, []):
              cov.get_data()
  
      def test_two_getdata_warn_twice(self):
          self.make_code1_code2()
          cov = coverage.Coverage(source=["."], omit=["code1.py", "code2.py"])
          cov.start()
          import_local_file("code1")                                     # pragma: nested
          # We didn't collect any data, so we should get a warning.
          with self.assert_warnings(cov, ["No data was collected"]):     # pragma: nested
              cov.save()                                                 # pragma: nested
          import_local_file("code2")                                     # pragma: nested
          # Calling get_data a second time after tracing some more will warn again.
          with self.assert_warnings(cov, ["No data was collected"]):     # pragma: nested
              cov.get_data()                                             # pragma: nested
          # Then stop it, or the test suite gets out of whack.
          cov.stop()                                                     # pragma: nested
  
      def make_good_data_files(self):
          """Make some good data files."""
          self.make_code1_code2()
          cov = coverage.Coverage(data_suffix=True)
          self.start_import_stop(cov, "code1")
          cov.save()
  
          cov = coverage.Coverage(data_suffix=True)
          self.start_import_stop(cov, "code2")
          cov.save()
          self.assert_file_count(".coverage.*", 2)
  
      def test_combining_corrupt_data(self):
          # If you combine a corrupt data file, then you will get a warning,
          # and the file will remain.
          self.make_good_data_files()
          self.make_file(".coverage.foo", """La la la, this isn't coverage data!""")
          cov = coverage.Coverage()
          warning_regex = (
              r"Couldn't use data file '.*\.coverage\.foo': file (is encrypted or )?is not a database"
          )
          with self.assert_warnings(cov, [warning_regex]):
              cov.combine()
  
          # We got the results from code1 and code2 properly.
          self.check_code1_code2(cov)
  
          # The bad file still exists, but it's the only parallel data file left.
          self.assert_exists(".coverage.foo")
          self.assert_file_count(".coverage.*", 1)
  
      def test_combining_twice(self):
          self.make_good_data_files()
          cov1 = coverage.Coverage()
          cov1.combine()
          assert self.stdout() == ""
          cov1.save()
          self.check_code1_code2(cov1)
          self.assert_file_count(".coverage.*", 0)
          self.assert_exists(".coverage")
  
          cov2 = coverage.Coverage()
          with pytest.raises(CoverageException, match=r"No data to combine"):
              cov2.combine(strict=True, keep=False)
  
          cov3 = coverage.Coverage()
          cov3.combine()
          assert self.stdout() == ""
          # Now the data is empty!
          _, statements, missing, _ = cov3.analysis("code1.py")
          assert statements == [1]
          assert missing == [1]
          _, statements, missing, _ = cov3.analysis("code2.py")
          assert statements == [1, 2]
          assert missing == [1, 2]
  
      def test_combining_with_a_used_coverage(self):
          # Can you use a coverage object to run one shard of a parallel suite,
          # and then also combine the data?
          self.make_code1_code2()
          cov = coverage.Coverage(data_suffix=True)
          self.start_import_stop(cov, "code1")
          cov.save()
  
          cov = coverage.Coverage(data_suffix=True)
          self.start_import_stop(cov, "code2")
          cov.save()
  
          cov.combine()
          assert self.stdout() == ""
          self.check_code1_code2(cov)
  
      def test_ordered_combine(self):
          # https://github.com/nedbat/coveragepy/issues/649
          # The order of the [paths] setting matters
          def make_data_file():
              data = coverage.CoverageData(".coverage.1")
              data.add_lines({abs_file('ci/girder/g1.py'): dict.fromkeys(range(10))})
              data.add_lines({abs_file('ci/girder/plugins/p1.py'): dict.fromkeys(range(10))})
              data.write()
  
          def get_combined_filenames():
              cov = coverage.Coverage()
              cov.combine()
              assert self.stdout() == ""
              cov.save()
              data = cov.get_data()
              filenames = {relative_filename(f).replace("\\", "/") for f in data.measured_files()}
              return filenames
  
          # Case 1: get the order right.
          make_data_file()
          self.make_file(".coveragerc", """\
              [paths]
              plugins =
                  plugins/
                  ci/girder/plugins/
              girder =
                  girder/
                  ci/girder/
              """)
          assert get_combined_filenames() == {'girder/g1.py', 'plugins/p1.py'}
  
          # Case 2: get the order wrong.
          make_data_file()
          self.make_file(".coveragerc", """\
              [paths]
              girder =
                  girder/
                  ci/girder/
              plugins =
                  plugins/
                  ci/girder/plugins/
              """)
          assert get_combined_filenames() == {'girder/g1.py', 'girder/plugins/p1.py'}
  
      def test_warnings(self):
          self.make_file("hello.py", """\
              import sys, os
              print("Hello")
              """)
          with pytest.warns(Warning) as warns:
              cov = coverage.Coverage(source=["sys", "xyzzy", "quux"])
              self.start_import_stop(cov, "hello")
              cov.get_data()
  
          assert "Hello\n" == self.stdout()
          assert_coverage_warnings(
              warns,
              "Module sys has no Python source. (module-not-python)",
              "Module xyzzy was never imported. (module-not-imported)",
              "Module quux was never imported. (module-not-imported)",
              "No data was collected. (no-data-collected)",
              )
  
      def test_warnings_suppressed(self):
          self.make_file("hello.py", """\
              import sys, os
              print("Hello")
              """)
          self.make_file(".coveragerc", """\
              [run]
              disable_warnings = no-data-collected, module-not-imported
              """)
          with pytest.warns(Warning) as warns:
              cov = coverage.Coverage(source=["sys", "xyzzy", "quux"])
              self.start_import_stop(cov, "hello")
              cov.get_data()
  
          assert "Hello\n" == self.stdout()
          assert_coverage_warnings(warns, "Module sys has no Python source. (module-not-python)")
          # No "module-not-imported" in warns
          # No "no-data-collected" in warns
  
      def test_warn_once(self):
          with pytest.warns(Warning) as warns:
              cov = coverage.Coverage()
              cov.load()
              cov._warn("Warning, warning 1!", slug="bot", once=True)
              cov._warn("Warning, warning 2!", slug="bot", once=True)
  
          assert_coverage_warnings(warns, "Warning, warning 1! (bot)")
          # No "Warning, warning 2!" in warns
  
      def test_source_and_include_dont_conflict(self):
          # A bad fix made this case fail: https://github.com/nedbat/coveragepy/issues/541
          self.make_file("a.py", "import b\na = 1")
          self.make_file("b.py", "b = 1")
          self.make_file(".coveragerc", """\
              [run]
              source = .
              """)
  
          # Just like: coverage run a.py
          cov = coverage.Coverage()
          self.start_import_stop(cov, "a")
          cov.save()
  
          # Run the equivalent of: coverage report --include=b.py
          cov = coverage.Coverage(include=["b.py"])
          cov.load()
          # There should be no exception. At one point, report() threw:
          # CoverageException: --include and --source are mutually exclusive
          cov.report()
          expected = textwrap.dedent("""\
              Name    Stmts   Miss  Cover
              ---------------------------
              b.py        1      0   100%
              ---------------------------
              TOTAL       1      0   100%
              """)
          assert expected == self.stdout()
  
      def make_test_files(self):
          """Create a simple file representing a method with two tests.
  
          Returns absolute path to the file.
          """
          self.make_file("testsuite.py", """\
              def timestwo(x):
                  return x*2
  
              def test_multiply_zero():
                  assert timestwo(0) == 0
  
              def test_multiply_six():
                  assert timestwo(6) == 12
              """)
  
      def test_switch_context_testrunner(self):
          # This test simulates a coverage-aware test runner,
          # measuring labeled coverage via public API
          self.make_test_files()
  
          # Test runner starts
          cov = coverage.Coverage()
          cov.start()
  
          if "pragma: nested":
              # Imports the test suite
              suite = import_local_file("testsuite")
  
              # Measures test case 1
              cov.switch_context('multiply_zero')
              suite.test_multiply_zero()
  
              # Measures test case 2
              cov.switch_context('multiply_six')
              suite.test_multiply_six()
  
              # Runner finishes
              cov.save()
              cov.stop()
  
          # Labeled data is collected
          data = cov.get_data()
          assert ['', 'multiply_six', 'multiply_zero'] == sorted(data.measured_contexts())
  
          filenames = self.get_measured_filenames(data)
          suite_filename = filenames['testsuite.py']
  
          data.set_query_context("multiply_six")
          assert [2, 8] == sorted(data.lines(suite_filename))
          data.set_query_context("multiply_zero")
          assert [2, 5] == sorted(data.lines(suite_filename))
  
      def test_switch_context_with_static(self):
          # This test simulates a coverage-aware test runner,
          # measuring labeled coverage via public API,
          # with static label prefix.
          self.make_test_files()
  
          # Test runner starts
          cov = coverage.Coverage(context="mysuite")
          cov.start()
  
          if "pragma: nested":
              # Imports the test suite
              suite = import_local_file("testsuite")
  
              # Measures test case 1
              cov.switch_context('multiply_zero')
              suite.test_multiply_zero()
  
              # Measures test case 2
              cov.switch_context('multiply_six')
              suite.test_multiply_six()
  
              # Runner finishes
              cov.save()
              cov.stop()
  
          # Labeled data is collected
          data = cov.get_data()
          expected = ['mysuite', 'mysuite|multiply_six', 'mysuite|multiply_zero']
          assert expected == sorted(data.measured_contexts())
  
          filenames = self.get_measured_filenames(data)
          suite_filename = filenames['testsuite.py']
  
          data.set_query_context("mysuite|multiply_six")
          assert [2, 8] == sorted(data.lines(suite_filename))
          data.set_query_context("mysuite|multiply_zero")
          assert [2, 5] == sorted(data.lines(suite_filename))
  
      def test_dynamic_context_conflict(self):
          cov = coverage.Coverage(source=["."])
          cov.set_option("run:dynamic_context", "test_function")
          cov.start()
          with pytest.warns(Warning) as warns:
              # Switch twice, but only get one warning.
              cov.switch_context("test1")                                 # pragma: nested
              cov.switch_context("test2")                                 # pragma: nested
          cov.stop()                                                      # pragma: nested
          assert_coverage_warnings(warns, "Conflicting dynamic contexts (dynamic-conflict)")
  
      def test_switch_context_unstarted(self):
          # Coverage must be started to switch context
          msg = "Cannot switch context, coverage is not started"
          cov = coverage.Coverage()
          with pytest.raises(CoverageException, match=msg):
              cov.switch_context("test1")
  
          cov.start()
          cov.switch_context("test2")                                     # pragma: nested
  
          cov.stop()                                                      # pragma: nested
          with pytest.raises(CoverageException, match=msg):
              cov.switch_context("test3")
  
      def test_config_crash(self):
          # The internal '[run] _crash' setting can be used to artificially raise
          # exceptions from inside Coverage.
          cov = coverage.Coverage()
          cov.set_option("run:_crash", "test_config_crash")
          with pytest.raises(Exception, match="Crashing because called by test_config_crash"):
              cov.start()
  
      def test_config_crash_no_crash(self):
          # '[run] _crash' really checks the call stack.
          cov = coverage.Coverage()
          cov.set_option("run:_crash", "not_my_caller")
          cov.start()
          cov.stop()
  
      def test_run_debug_sys(self):
          # https://github.com/nedbat/coveragepy/issues/907
          cov = coverage.Coverage()
          cov.start()
          d = dict(cov.sys_info())        # pragma: nested
          cov.stop()                      # pragma: nested
          assert d['data_file'].endswith(".coverage")
  
  
  class CurrentInstanceTest(CoverageTest):
      """Tests of Coverage.current()."""
  
      run_in_temp_dir = False
  
      def assert_current_is_none(self, current):
          """Assert that a current we expect to be None is correct."""
          # During meta-coverage, the None answers will be wrong because the
          # overall coverage measurement will still be on the current-stack.
          # Since we know they will be wrong, and we have non-meta test runs
          # also, don't assert them.
          if not env.METACOV:
              assert current is None
  
      def test_current(self):
          cur0 = coverage.Coverage.current()
          self.assert_current_is_none(cur0)
          # Making an instance doesn't make it current.
          cov = coverage.Coverage()
          cur1 = coverage.Coverage.current()
          self.assert_current_is_none(cur1)
          assert cur0 is cur1
          # Starting the instance makes it current.
          cov.start()
          if "# pragma: nested":
              cur2 = coverage.Coverage.current()
              assert cur2 is cov
              # Stopping the instance makes current None again.
              cov.stop()
  
          cur3 = coverage.Coverage.current()
          self.assert_current_is_none(cur3)
          assert cur0 is cur3
  
  
  class NamespaceModuleTest(UsingModulesMixin, CoverageTest):
      """Test PEP-420 namespace modules."""
  
      def test_explicit_namespace_module(self):
          self.make_file("main.py", "import namespace_420\n")
  
          cov = coverage.Coverage()
          self.start_import_stop(cov, "main")
  
          with pytest.raises(CoverageException, match=r"Module .* has no file"):
              cov.analysis(sys.modules['namespace_420'])
  
      def test_bug_572(self):
          self.make_file("main.py", "import namespace_420\n")
  
          # Use source=namespace_420 to trigger the check that used to fail,
          # and use source=main so that something is measured.
          cov = coverage.Coverage(source=["namespace_420", "main"])
          with self.assert_warnings(cov, []):
              self.start_import_stop(cov, "main")
              cov.report()
  
  
  class IncludeOmitTestsMixin(UsingModulesMixin, CoverageTest):
      """Test methods for coverage methods taking include and omit."""
  
      def filenames_in(self, summary, filenames):
          """Assert the `filenames` are in the keys of `summary`."""
          for filename in filenames.split():
              assert filename in summary
  
      def filenames_not_in(self, summary, filenames):
          """Assert the `filenames` are not in the keys of `summary`."""
          for filename in filenames.split():
              assert filename not in summary
  
      def test_nothing_specified(self):
          result = self.coverage_usepkgs()
          self.filenames_in(result, "p1a p1b p2a p2b othera otherb osa osb")
          self.filenames_not_in(result, "p1c")
          # Because there was no source= specified, we don't search for
          # unexecuted files.
  
      def test_include(self):
          result = self.coverage_usepkgs(include=["*/p1a.py"])
          self.filenames_in(result, "p1a")
          self.filenames_not_in(result, "p1b p1c p2a p2b othera otherb osa osb")
  
      def test_include_2(self):
          result = self.coverage_usepkgs(include=["*a.py"])
          self.filenames_in(result, "p1a p2a othera osa")
          self.filenames_not_in(result, "p1b p1c p2b otherb osb")
  
      def test_include_as_string(self):
          result = self.coverage_usepkgs(include="*a.py")
          self.filenames_in(result, "p1a p2a othera osa")
          self.filenames_not_in(result, "p1b p1c p2b otherb osb")
  
      def test_omit(self):
          result = self.coverage_usepkgs(omit=["*/p1a.py"])
          self.filenames_in(result, "p1b p2a p2b")
          self.filenames_not_in(result, "p1a p1c")
  
      def test_omit_2(self):
          result = self.coverage_usepkgs(omit=["*a.py"])
          self.filenames_in(result, "p1b p2b otherb osb")
          self.filenames_not_in(result, "p1a p1c p2a othera osa")
  
      def test_omit_as_string(self):
          result = self.coverage_usepkgs(omit="*a.py")
          self.filenames_in(result, "p1b p2b otherb osb")
          self.filenames_not_in(result, "p1a p1c p2a othera osa")
  
      def test_omit_and_include(self):
          result = self.coverage_usepkgs(include=["*/p1*"], omit=["*/p1a.py"])
          self.filenames_in(result, "p1b")
          self.filenames_not_in(result, "p1a p1c p2a p2b")
  
  
  class SourceIncludeOmitTest(IncludeOmitTestsMixin, CoverageTest):
      """Test using `source`, `include`, and `omit` when measuring code."""
  
      def coverage_usepkgs(self, **kwargs):
          """Run coverage on usepkgs and return the line summary.
  
          Arguments are passed to the `coverage.Coverage` constructor.
  
          """
          cov = coverage.Coverage(**kwargs)
          cov.start()
          import usepkgs  # pragma: nested   # pylint: disable=import-error, unused-import
          cov.stop()      # pragma: nested
          data = cov.get_data()
          summary = line_counts(data)
          for k, v in list(summary.items()):
              assert k.endswith(".py")
              summary[k[:-3]] = v
          return summary
  
      def test_source_include_exclusive(self):
          cov = coverage.Coverage(source=["pkg1"], include=["pkg2"])
          with self.assert_warnings(cov, ["--include is ignored because --source is set"]):
              cov.start()
          cov.stop()      # pragma: nested
  
      def test_source_package_as_package(self):
          assert not os.path.isdir("pkg1")
          lines = self.coverage_usepkgs(source=["pkg1"])
          self.filenames_in(lines, "p1a p1b")
          self.filenames_not_in(lines, "p2a p2b othera otherb osa osb")
          # Because source= was specified, we do search for unexecuted files.
          assert lines['p1c'] == 0
  
      def test_source_package_as_dir(self):
          os.chdir(nice_file(TESTS_DIR, "modules"))
          assert os.path.isdir("pkg1")
          lines = self.coverage_usepkgs(source=["pkg1"])
          self.filenames_in(lines, "p1a p1b")
          self.filenames_not_in(lines, "p2a p2b othera otherb osa osb")
          # Because source= was specified, we do search for unexecuted files.
          assert lines['p1c'] == 0
  
      def test_source_package_dotted_sub(self):
          lines = self.coverage_usepkgs(source=["pkg1.sub"])
          self.filenames_not_in(lines, "p2a p2b othera otherb osa osb")
          # Because source= was specified, we do search for unexecuted files.
          assert lines['runmod3'] == 0
  
      def test_source_package_dotted_p1b(self):
          lines = self.coverage_usepkgs(source=["pkg1.p1b"])
          self.filenames_in(lines, "p1b")
          self.filenames_not_in(lines, "p1a p1c p2a p2b othera otherb osa osb")
  
      def test_source_package_part_omitted(self):
          # https://github.com/nedbat/coveragepy/issues/218
          # Used to be if you omitted something executed and inside the source,
          # then after it was executed but not recorded, it would be found in
          # the search for unexecuted files, and given a score of 0%.
  
          # The omit arg is by path, so need to be in the modules directory.
          os.chdir(nice_file(TESTS_DIR, "modules"))
          lines = self.coverage_usepkgs(source=["pkg1"], omit=["pkg1/p1b.py"])
          self.filenames_in(lines, "p1a")
          self.filenames_not_in(lines, "p1b")
          assert lines['p1c'] == 0
  
      def test_source_package_as_package_part_omitted(self):
          # https://github.com/nedbat/coveragepy/issues/638
          lines = self.coverage_usepkgs(source=["pkg1"], omit=["*/p1b.py"])
          self.filenames_in(lines, "p1a")
          self.filenames_not_in(lines, "p1b")
          assert lines['p1c'] == 0
  
      def test_ambiguous_source_package_as_dir(self):
          # pkg1 is a directory and a pkg, since we cd into tests/modules/ambiguous
          os.chdir(nice_file(TESTS_DIR, "modules", "ambiguous"))
          # pkg1 defaults to directory because tests/modules/ambiguous/pkg1 exists
          lines = self.coverage_usepkgs(source=["pkg1"])
          self.filenames_in(lines, "ambiguous")
          self.filenames_not_in(lines, "p1a p1b p1c")
  
      def test_ambiguous_source_package_as_package(self):
          # pkg1 is a directory and a pkg, since we cd into tests/modules/ambiguous
          os.chdir(nice_file(TESTS_DIR, "modules", "ambiguous"))
          lines = self.coverage_usepkgs(source_pkgs=["pkg1"])
          self.filenames_in(lines, "p1a p1b")
          self.filenames_not_in(lines, "p2a p2b othera otherb osa osb ambiguous")
          # Because source= was specified, we do search for unexecuted files.
          assert lines['p1c'] == 0
  
  
  class ReportIncludeOmitTest(IncludeOmitTestsMixin, CoverageTest):
      """Tests of the report include/omit functionality."""
  
      def coverage_usepkgs(self, **kwargs):
          """Try coverage.report()."""
          cov = coverage.Coverage()
          cov.start()
          import usepkgs  # pragma: nested   # pylint: disable=import-error, unused-import
          cov.stop()      # pragma: nested
          report = io.StringIO()
          cov.report(file=report, **kwargs)
          return report.getvalue()
  
  
  class XmlIncludeOmitTest(IncludeOmitTestsMixin, CoverageTest):
      """Tests of the XML include/omit functionality.
  
      This also takes care of the HTML and annotate include/omit, by virtue
      of the structure of the code.
  
      """
  
      def coverage_usepkgs(self, **kwargs):
          """Try coverage.xml_report()."""
          cov = coverage.Coverage()
          cov.start()
          import usepkgs  # pragma: nested   # pylint: disable=import-error, unused-import
          cov.stop()      # pragma: nested
          cov.xml_report(outfile="-", **kwargs)
          return self.stdout()
  
  
  class AnalysisTest(CoverageTest):
      """Test the numerical analysis of results."""
      def test_many_missing_branches(self):
          cov = coverage.Coverage(branch=True)
  
          self.make_file("missing.py", """\
              def fun1(x):
                  if x == 1:
                      print("one")
                  else:
                      print("not one")
                  print("done")           # pragma: nocover
  
              def fun2(x):
                  print("x")
  
              fun2(3)
              """)
  
          # Import the Python file, executing it.
          self.start_import_stop(cov, "missing")
  
          nums = cov._analyze("missing.py").numbers
          assert nums.n_files == 1
          assert nums.n_statements == 7
          assert nums.n_excluded == 1
          assert nums.n_missing == 3
          assert nums.n_branches == 2
          assert nums.n_partial_branches == 0
          assert nums.n_missing_branches == 2
  
  
  class TestRunnerPluginTest(CoverageTest):
      """Test that the API works properly the way various third-party plugins call it.
  
      We don't actually use the plugins, but these tests call the API the same
      way they do.
  
      """
      def pretend_to_be_nose_with_cover(self, erase=False, cd=False):
          """This is what the nose --with-cover plugin does."""
          self.make_file("no_biggie.py", """\
              a = 1
              b = 2
              if b == 1:
                  c = 4
              """)
          self.make_file("sub/hold.txt", "")
  
          cov = coverage.Coverage()
          if erase:
              cov.combine()
              cov.erase()
          cov.load()
          self.start_import_stop(cov, "no_biggie")
          if cd:
              os.chdir("sub")
          cov.combine()
          cov.save()
          cov.report(["no_biggie.py"], show_missing=True)
          assert self.stdout() == textwrap.dedent("""\
              Name           Stmts   Miss  Cover   Missing
              --------------------------------------------
              no_biggie.py       4      1    75%   4
              --------------------------------------------
              TOTAL              4      1    75%
              """)
          if cd:
              os.chdir("..")
  
      def test_nose_plugin(self):
          self.pretend_to_be_nose_with_cover()
  
      def test_nose_plugin_with_erase(self):
          self.pretend_to_be_nose_with_cover(erase=True)
  
      def test_nose_plugin_with_cd(self):
          # https://github.com/nedbat/coveragepy/issues/916
          self.pretend_to_be_nose_with_cover(cd=True)
  
      def pretend_to_be_pytestcov(self, append):
          """Act like pytest-cov."""
          self.make_file("prog.py", """\
              a = 1
              b = 2
              if b == 1:
                  c = 4
              """)
          self.make_file(".coveragerc", """\
              [run]
              parallel = True
              source = .
              """)
  
          cov = coverage.Coverage(source=None, branch=None, config_file='.coveragerc')
          if append:
              cov.load()
          else:
              cov.erase()
          self.start_import_stop(cov, "prog")
          cov.combine()
          cov.save()
          report = io.StringIO()
          cov.report(show_missing=None, ignore_errors=True, file=report, skip_covered=None,
                     skip_empty=None)
          assert report.getvalue() == textwrap.dedent("""\
              Name      Stmts   Miss  Cover
              -----------------------------
              prog.py       4      1    75%
              -----------------------------
              TOTAL         4      1    75%
              """)
          self.assert_file_count(".coverage", 0)
          self.assert_file_count(".coverage.*", 1)
  
      def test_pytestcov_parallel(self):
          self.pretend_to_be_pytestcov(append=False)
  
      def test_pytestcov_parallel_append(self):
          self.pretend_to_be_pytestcov(append=True)
  
  
  class ImmutableConfigTest(CoverageTest):
      """Check that reporting methods don't permanently change the configuration."""
      def test_config_doesnt_change(self):
          self.make_file("simple.py", "a = 1")
          cov = coverage.Coverage()
          self.start_import_stop(cov, "simple")
          assert cov.get_option("report:show_missing") is False
          cov.report(show_missing=True)
          assert cov.get_option("report:show_missing") is False
  
  
  class RelativePathTest(CoverageTest):
      """Tests of the relative_files setting."""
      def test_moving_stuff(self):
          # When using absolute file names, moving the source around results in
          # "No source for code" errors while reporting.
          self.make_file("foo.py", "a = 1")
          cov = coverage.Coverage(source=["."])
          self.start_import_stop(cov, "foo")
          res = cov.report()
          assert res == 100
  
          expected = re.escape("No source for code: '{}'.".format(abs_file("foo.py")))
          os.remove("foo.py")
          self.make_file("new/foo.py", "a = 1")
          shutil.move(".coverage", "new/.coverage")
          with change_dir("new"):
              cov = coverage.Coverage()
              cov.load()
              with pytest.raises(CoverageException, match=expected):
                  cov.report()
  
      def test_moving_stuff_with_relative(self):
          # When using relative file names, moving the source around is fine.
          self.make_file("foo.py", "a = 1")
          self.make_file(".coveragerc", """\
              [run]
              relative_files = true
              """)
          cov = coverage.Coverage(source=["."])
          self.start_import_stop(cov, "foo")
          res = cov.report()
          assert res == 100
  
          os.remove("foo.py")
          self.make_file("new/foo.py", "a = 1")
          shutil.move(".coverage", "new/.coverage")
          shutil.move(".coveragerc", "new/.coveragerc")
          with change_dir("new"):
              cov = coverage.Coverage()
              cov.load()
              res = cov.report()
              assert res == 100
  
      def test_combine_relative(self):
          self.make_file("dir1/foo.py", "a = 1")
          self.make_file("dir1/.coveragerc", """\
              [run]
              relative_files = true
              """)
          with change_dir("dir1"):
              cov = coverage.Coverage(source=["."], data_suffix=True)
              self.start_import_stop(cov, "foo")
              cov.save()
              shutil.move(glob.glob(".coverage.*")[0], "..")
  
          self.make_file("dir2/bar.py", "a = 1")
          self.make_file("dir2/.coveragerc", """\
              [run]
              relative_files = true
              """)
          with change_dir("dir2"):
              cov = coverage.Coverage(source=["."], data_suffix=True)
              self.start_import_stop(cov, "bar")
              cov.save()
              shutil.move(glob.glob(".coverage.*")[0], "..")
  
          self.make_file(".coveragerc", """\
              [run]
              relative_files = true
              """)
          cov = coverage.Coverage()
          cov.combine()
          cov.save()
  
          self.make_file("foo.py", "a = 1")
          self.make_file("bar.py", "a = 1")
  
          cov = coverage.Coverage()
          cov.load()
          files = cov.get_data().measured_files()
          assert files == {'foo.py', 'bar.py'}
          res = cov.report()
          assert res == 100
  