Allow to set a string value instead of a list on Browser.displayValue.

CHANGES.rst

@@ -17,6 +17,8 @@ CHANGES
 
 - Restore the ability to use parts of the actually displayed select box titles.
 
+- Allow to set a string value instead of a list on `Browser.displayValue`.
+
 - Fix setting empty values on a select control.
 
 

src/zope/testbrowser/browser.py

@@ -21,6 +21,7 @@
 from contextlib import contextmanager
 
 from six.moves import urllib_robotparser
+from six import string_types
 
 from zope.interface import implementer
 from zope.cachedescriptors.property import Lazy
@@ -845,6 +846,8 @@ def displayValue(self, value):
         if self._browser_counter != self.browser._counter:
             raise interfaces.ExpiredError
 
+        if isinstance(value, string_types):
+            value = [value]
         values = []
         for key, titles in self._getOptions():
             if any(v in t

src/zope/testbrowser/tests/test_browser.py

@@ -111,6 +111,11 @@ def test_displayValue_partial_title(self):
         self.control.displayValue = ['erna']
         self.assertEqual(self.control.displayValue, ['Alternative'])
 
+    def test_displayValue_handles_set_of_string(self):
+        self.assertEqual(self.control.displayValue, ['Turn'])
+        self.control.displayValue = 'erna'
+        self.assertEqual(self.control.displayValue, ['Alternative'])
+
 
 def test_relative_redirect(self):
     """