How to use the coverage.misc.NoSource function in coverage

def test_filereporter():
    from covimerage.coveragepy import FileReporter

    f = FileReporter('/doesnotexist')
    assert repr(f) == ""

    with pytest.raises(coverage.misc.NoSource) as excinfo:
        f.lines()
    assert excinfo.value.args == (
        "[Errno 2] No such file or directory: '/doesnotexist'",)

def test_directory_without_main(self):
        self.make_file("without_main/__init__.py", "")
        with self.assertRaisesRegex(NoSource, "Can't find '__main__' module in 'without_main'"):
            run_python_file(["without_main"])

def make_code_from_py(filename):
    """Get source from `filename` and make a code object of it."""
    # Open the source file.
    try:
        source = get_python_source(filename)
    except (IOError, NoSource):
        raise NoSource("No file to run: '%s'" % filename)

    code = compile_unicode(source, filename, "exec")
    return code

`config` is a CoverageConfig instance.

        """
        self.find_code_units(morfs, config)

        if not self.code_units:
            raise CoverageException("No data to report.")

        self.directory = directory
        if self.directory and not os.path.exists(self.directory):
            os.makedirs(self.directory)

        for cu in self.code_units:
            try:
                report_fn(cu, self.coverage._analyze(cu))
            except (NoSource, NotPython):
                if not self.ignore_errors:
                    raise

def find_module(modulename):
        """Find the module named `modulename`.

        Returns the file path of the module, the name of the enclosing
        package, and the spec.
        """
        try:
            spec = importlib_util_find_spec(modulename)
        except ImportError as err:
            raise NoSource(str(err))
        if not spec:
            raise NoSource("No module named %r" % (modulename,))
        pathname = spec.origin
        packagename = spec.name
        if spec.submodule_search_locations:
            mod_main = modulename + ".__main__"
            spec = importlib_util_find_spec(mod_main)
            if not spec:
                raise NoSource(
                    "No module named %s; "
                    "%r is a package and cannot be directly executed"
                    % (mod_main, modulename)
                )
            pathname = spec.origin
            packagename = spec.name
        packagename = packagename.rpartition(".")[0]
        return pathname, packagename, spec
else:

for ext in exts:
        try_filename = base + ext
        if os.path.exists(try_filename):
            # A regular text file: open it.
            source = read_python_source(try_filename)
            break

        # Maybe it's in a zip file?
        source = get_zip_bytes(try_filename)
        if source is not None:
            break
    else:
        # Couldn't find source.
        exc_msg = "No source for code: '%s'.\n" % (filename,)
        exc_msg += "Aborting report output, consider using -i."
        raise NoSource(exc_msg)

    # Replace \f because of http://bugs.python.org/issue19035
    source = source.replace(b'\f', b' ')
    source = source.decode(source_encoding(source), "replace")

    # Python code should always end with a line with a newline.
    if source and source[-1] != '\n':
        source += '\n'

    return source

# Complain if this is a magic non-file module.
            if openfile is None and pathname is None:
                raise NoSource(
                    "module does not live in a file: %r" % modulename
                    )

            # If `modulename` is actually a package, not a mere module, then we
            # pretend to be Python 2.7 and try running its __main__.py script.
            if openfile is None:
                packagename = modulename
                name = '__main__'
                package = __import__(packagename, glo, loc, ['__path__'])
                searchpath = package.__path__
                openfile, pathname, _ = imp.find_module(name, searchpath)
        except ImportError as err:
            raise NoSource(str(err))
        finally:
            if openfile:
                openfile.close()

        return pathname, packagename, None

def __init__(self, cov, code_unit):
        self.coverage = cov
        self.code_unit = code_unit

        self.filename = self.code_unit.filename
        ext = os.path.splitext(self.filename)[1]
        source = None
        if ext == '.py':
            if not os.path.exists(self.filename):
                source = self.coverage.file_locator.get_zip_data(self.filename)
                if not source:
                    raise NoSource("No source for code: %r" % self.filename)

        self.parser = CodeParser(
            text=source, filename=self.filename,
            exclude=self.coverage._exclude_regex('exclude')
            )
        self.statements, self.excluded = self.parser.parse_source()

        # Identify missing statements.
        executed = self.coverage.data.executed_lines(self.filename)
        exec1 = self.parser.first_lines(executed)
        self.missing = sorted(set(self.statements) - set(exec1))

        if self.coverage.data.has_arcs():
            self.no_branch = self.parser.lines_matching(
                join_regex(self.coverage.config.partial_list),
                join_regex(self.coverage.config.partial_always_list)

"Remove --{} from the command line.".format(opt_name)
                    )
                    return ERR

        runner = PyRunner(args, as_module=bool(options.module))
        runner.prepare()

        if options.append:
            self.coverage.load()

        # Run the script.
        self.coverage.start()
        code_ran = True
        try:
            runner.run()
        except NoSource:
            code_ran = False
            raise
        finally:
            self.coverage.stop()
            if code_ran:
                self.coverage.save()

        return OK