Ausgabe der neuen DB Einträge

venv/lib/python3.9/site-packages/twisted/internet/test/test_glibbase.py

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+# Copyright (c) Twisted Matrix Laboratories.
+# See LICENSE for details.
+
+"""
+Tests for twisted.internet.glibbase.
+"""
+
+from __future__ import division, absolute_import
+
+import sys
+from twisted.trial.unittest import TestCase
+from twisted.internet._glibbase import ensureNotImported
+
+
+
+class EnsureNotImportedTests(TestCase):
+    """
+    L{ensureNotImported} protects against unwanted past and future imports.
+    """
+
+    def test_ensureWhenNotImported(self):
+        """
+        If the specified modules have never been imported, and import
+        prevention is requested, L{ensureNotImported} makes sure they will not
+        be imported in the future.
+        """
+        modules = {}
+        self.patch(sys, "modules", modules)
+        ensureNotImported(["m1", "m2"], "A message.",
+                          preventImports=["m1", "m2", "m3"])
+        self.assertEqual(modules, {"m1": None, "m2": None, "m3": None})
+
+
+    def test_ensureWhenNotImportedDontPrevent(self):
+        """
+        If the specified modules have never been imported, and import
+        prevention is not requested, L{ensureNotImported} has no effect.
+        """
+        modules = {}
+        self.patch(sys, "modules", modules)
+        ensureNotImported(["m1", "m2"], "A message.")
+        self.assertEqual(modules, {})
+
+
+    def test_ensureWhenFailedToImport(self):
+        """
+        If the specified modules have been set to L{None} in C{sys.modules},
+        L{ensureNotImported} does not complain.
+        """
+        modules = {"m2": None}
+        self.patch(sys, "modules", modules)
+        ensureNotImported(["m1", "m2"], "A message.", preventImports=["m1", "m2"])
+        self.assertEqual(modules, {"m1": None, "m2": None})
+
+
+    def test_ensureFailsWhenImported(self):
+        """
+        If one of the specified modules has been previously imported,
+        L{ensureNotImported} raises an exception.
+        """
+        module = object()
+        modules = {"m2": module}
+        self.patch(sys, "modules", modules)
+        e = self.assertRaises(ImportError, ensureNotImported,
+                              ["m1", "m2"], "A message.",
+                              preventImports=["m1", "m2"])
+        self.assertEqual(modules, {"m2": module})
+        self.assertEqual(e.args, ("A message.",))