Fix typo.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 102a187..0c179bb 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -752,7 +752,7 @@
 
    .. method:: skipTest(reason)
 
-      Calling this during the a test method or :meth:`setUp` skips the current
+      Calling this during a test method or :meth:`setUp` skips the current
       test.  See :ref:`unittest-skipping` for more information.
 
       .. versionadded:: 2.7