Lib/test/test_runpy.py

# Test the runpy module
import unittest
import os
import os.path
import sys
import tempfile
from test.support import verbose, run_unittest, forget
from runpy import _run_code, _run_module_code, run_module

# Note: This module can't safely test _run_module_as_main as it
# runs its tests in the current process, which would mess with the
# real __main__ module (usually test.regrtest)
# See test_cmd_line_script for a test that executes that code path

# Set up the test code and expected results

class RunModuleCodeTest(unittest.TestCase):

    expected_result = ["Top level assignment", "Lower level reference"]
    test_source = (
        "# Check basic code execution\n"
        "result = ['Top level assignment']\n"
        "def f():\n"
        "    result.append('Lower level reference')\n"
        "f()\n"
        "# Check the sys module\n"
        "import sys\n"
        "run_argv0 = sys.argv[0]\n"
        "run_name_in_sys_modules = __name__ in sys.modules\n"
        "if run_name_in_sys_modules:\n"
        "   module_in_sys_modules = globals() is sys.modules[__name__].__dict__\n"
        "# Check nested operation\n"
        "import runpy\n"
        "nested = runpy._run_module_code('x=1\\n', mod_name='<run>')\n"
    )

    def test_run_code(self):
        saved_argv0 = sys.argv[0]
        d = _run_code(self.test_source, {})
        self.failUnless(d["result"] == self.expected_result)
        self.failUnless(d["__name__"] is None)
        self.failUnless(d["__file__"] is None)
        self.failUnless(d["__loader__"] is None)
        self.failUnless(d["__package__"] is None)
        self.failUnless(d["run_argv0"] is saved_argv0)
        self.failUnless("run_name" not in d)
        self.failUnless(sys.argv[0] is saved_argv0)

    def test_run_module_code(self):
        initial = object()
        name = "<Nonsense>"
        file = "Some other nonsense"
        loader = "Now you're just being silly"
        package = '' # Treat as a top level module
        d1 = dict(initial=initial)
        saved_argv0 = sys.argv[0]
        d2 = _run_module_code(self.test_source,
                              d1,
                              name,
                              file,
                              loader,
                              package)
        self.failUnless("result" not in d1)
        self.failUnless(d2["initial"] is initial)
        self.assertEqual(d2["result"], self.expected_result)
        self.assertEqual(d2["nested"]["x"], 1)
        self.failUnless(d2["__name__"] is name)
        self.failUnless(d2["run_name_in_sys_modules"])
        self.failUnless(d2["module_in_sys_modules"])
        self.failUnless(d2["__file__"] is file)
        self.failUnless(d2["run_argv0"] is file)
        self.failUnless(d2["__loader__"] is loader)
        self.failUnless(d2["__package__"] is package)
        self.failUnless(sys.argv[0] is saved_argv0)
        self.failUnless(name not in sys.modules)


class RunModuleTest(unittest.TestCase):

    def expect_import_error(self, mod_name):
        try:
            run_module(mod_name)
        except ImportError:
            pass
        else:
            self.fail("Expected import error for " + mod_name)

    def test_invalid_names(self):
        # Builtin module
        self.expect_import_error("sys")
        # Non-existent modules
        self.expect_import_error("sys.imp.eric")
        self.expect_import_error("os.path.half")
        self.expect_import_error("a.bee")
        self.expect_import_error(".howard")
        self.expect_import_error("..eaten")
        # Package
        self.expect_import_error("logging")

    def test_library_module(self):
        run_module("runpy")

    def _add_pkg_dir(self, pkg_dir):
        os.mkdir(pkg_dir)
        pkg_fname = os.path.join(pkg_dir, "__init__.py")
        pkg_file = open(pkg_fname, "w")
        pkg_file.close()
        return pkg_fname

    def _make_pkg(self, source, depth):
        pkg_name = "__runpy_pkg__"
        test_fname = "runpy_test.py"
        pkg_dir = sub_dir = tempfile.mkdtemp()
        if verbose: print("  Package tree in:", sub_dir)
        sys.path.insert(0, pkg_dir)
        if verbose: print("  Updated sys.path:", sys.path[0])
        for i in range(depth):
            sub_dir = os.path.join(sub_dir, pkg_name)
            pkg_fname = self._add_pkg_dir(sub_dir)
            if verbose: print("  Next level in:", sub_dir)
            if verbose: print("  Created:", pkg_fname)
        mod_fname = os.path.join(sub_dir, test_fname)
        mod_file = open(mod_fname, "w")
        mod_file.write(source)
        mod_file.close()
        if verbose: print("  Created:", mod_fname)
        mod_name = (pkg_name+".")*depth + "runpy_test"
        return pkg_dir, mod_fname, mod_name

    def _del_pkg(self, top, depth, mod_name):
        for entry in list(sys.modules):
            if entry.startswith("__runpy_pkg__"):
                del sys.modules[entry]
        if verbose: print("  Removed sys.modules entries")
        del sys.path[0]
        if verbose: print("  Removed sys.path entry")
        for root, dirs, files in os.walk(top, topdown=False):
            for name in files:
                try:
                    os.remove(os.path.join(root, name))
                except OSError as ex:
                    if verbose: print(ex) # Persist with cleaning up
            for name in dirs:
                fullname = os.path.join(root, name)
                try:
                    os.rmdir(fullname)
                except OSError as ex:
                    if verbose: print(ex) # Persist with cleaning up
        try:
            os.rmdir(top)
            if verbose: print("  Removed package tree")
        except OSError as ex:
            if verbose: print(ex) # Persist with cleaning up

    def _check_module(self, depth):
        pkg_dir, mod_fname, mod_name = (
               self._make_pkg("x=1\n", depth))
        forget(mod_name)
        try:
            if verbose: print("Running from source:", mod_name)
            d1 = run_module(mod_name) # Read from source
            self.failUnless("x" in d1)
            self.assertEqual(d1["x"], 1)
            del d1 # Ensure __loader__ entry doesn't keep file open
            __import__(mod_name)
            os.remove(mod_fname)
            if verbose: print("Running from compiled:", mod_name)
            d2 = run_module(mod_name) # Read from bytecode
            self.failUnless("x" in d2)
            self.assertEqual(d2["x"], 1)
            del d2 # Ensure __loader__ entry doesn't keep file open
        finally:
            self._del_pkg(pkg_dir, depth, mod_name)
        if verbose: print("Module executed successfully")

    def _add_relative_modules(self, base_dir, source, depth):
        if depth <= 1:
            raise ValueError("Relative module test needs depth > 1")
        pkg_name = "__runpy_pkg__"
        module_dir = base_dir
        for i in range(depth):
            parent_dir = module_dir
            module_dir = os.path.join(module_dir, pkg_name)
        # Add sibling module
        sibling_fname = os.path.join(module_dir, "sibling.py")
        sibling_file = open(sibling_fname, "w")
        sibling_file.close()
        if verbose: print("  Added sibling module:", sibling_fname)
        # Add nephew module
        uncle_dir = os.path.join(parent_dir, "uncle")
        self._add_pkg_dir(uncle_dir)
        if verbose: print("  Added uncle package:", uncle_dir)
        cousin_dir = os.path.join(uncle_dir, "cousin")
        self._add_pkg_dir(cousin_dir)
        if verbose: print("  Added cousin package:", cousin_dir)
        nephew_fname = os.path.join(cousin_dir, "nephew.py")
        nephew_file = open(nephew_fname, "w")
        nephew_file.close()
        if verbose: print("  Added nephew module:", nephew_fname)

    def _check_relative_imports(self, depth, run_name=None):
        contents = r"""\
from __future__ import absolute_import
from . import sibling
from ..uncle.cousin import nephew
"""
        pkg_dir, mod_fname, mod_name = (
               self._make_pkg(contents, depth))
        try:
            self._add_relative_modules(pkg_dir, contents, depth)
            pkg_name = mod_name.rpartition('.')[0]
            if verbose: print("Running from source:", mod_name)
            d1 = run_module(mod_name, run_name=run_name) # Read from source
            self.failUnless("__package__" in d1)
            self.failUnless(d1["__package__"] == pkg_name)
            self.failUnless("sibling" in d1)
            self.failUnless("nephew" in d1)
            del d1 # Ensure __loader__ entry doesn't keep file open
            __import__(mod_name)
            os.remove(mod_fname)
            if verbose: print("Running from compiled:", mod_name)
            d2 = run_module(mod_name, run_name=run_name) # Read from bytecode
            self.failUnless("__package__" in d2)
            self.failUnless(d2["__package__"] == pkg_name)
            self.failUnless("sibling" in d2)
            self.failUnless("nephew" in d2)
            del d2 # Ensure __loader__ entry doesn't keep file open
        finally:
            self._del_pkg(pkg_dir, depth, mod_name)
        if verbose: print("Module executed successfully")

    def test_run_module(self):
        for depth in range(4):
            if verbose: print("Testing package depth:", depth)
            self._check_module(depth)

    def test_explicit_relative_import(self):
        for depth in range(2, 5):
            if verbose: print("Testing relative imports at depth:", depth)
            self._check_relative_imports(depth)

    def test_main_relative_import(self):
        for depth in range(2, 5):
            if verbose: print("Testing main relative imports at depth:", depth)
            self._check_relative_imports(depth, "__main__")


def test_main():
    run_unittest(RunModuleCodeTest)
    run_unittest(RunModuleTest)

if __name__ == "__main__":
    test_main()