Adds Wait Until Page Does Not Contain method

Author: deiga

src/Selenium2Library/keywords/_waiting.py

@@ -45,6 +45,27 @@ def wait_until_page_contains(self, text, timeout=None, error=None):
             error = "Text '%s' did not appear in <TIMEOUT>" % text
         self._wait_until(timeout, error, self._is_text_present, text)
 
+    def wait_until_page_does_not_contain(self, text, timeout=None, error=None):
+        """Waits until `text` disappears from current page.
+
+        Fails if `timeout` expires before the `text` disappears. See
+        `introduction` for more information about `timeout` and its
+        default value.
+
+        `error` can be used to override the default error message.
+
+        See also `Wait Until Page Contains`, `Wait For Condition`,
+        `Wait Until Element Is Visible` and BuiltIn keyword `Wait Until
+        Keyword Succeeds`.
+        """
+        def check_present():
+            present = self._is_text_present(text)
+            if not present:
+                return
+            else:
+                return error or "Text '%s' did not disappear in %s" % (text, self._format_timeout(timeout))
+        self._wait_until_no_error(timeout, check_present)
+
     def wait_until_page_contains_element(self, locator, timeout=None, error=None):
         """Waits until element specified with `locator` appears on current page.