Allow to unset more than one env var at once.

Author: picnixz

Doc/library/test.rst

@@ -1435,9 +1435,12 @@ The :mod:`test.support.os_helper` module provides support for os tests.
    ``value``.
 
 
-.. method:: EnvironmentVarGuard.unset(envvar)
+.. method:: EnvironmentVarGuard.unset(envvar, *others)
 
-   Temporarily unset the environment variable ``envvar``.
+   Temporarily unset one or more environment variables.
+
+   .. versionchanged:: next
+      More than one environment variable can be unset.
 
 
 .. function:: can_symlink()

Lib/test/support/os_helper.py

@@ -720,9 +720,10 @@ def temp_umask(umask):
 
 
 class EnvironmentVarGuard(collections.abc.MutableMapping):
+    """Class to help protect the environment variable properly.
 
-    """Class to help protect the environment variable properly.  Can be used as
-    a context manager."""
+    Can be used as a context manager.
+    """
 
     def __init__(self):
         self._environ = os.environ
@@ -756,8 +757,10 @@ def __len__(self):
     def set(self, envvar, value):
         self[envvar] = value
 
-    def unset(self, envvar):
-        del self[envvar]
+    def unset(self, envvar, /, *envvars):
+        """Unset one or more known environment variables."""
+        for ev in (envvar, *envvars):
+            del self[ev]
 
     def copy(self):
         # We do what os.environ.copy() does.