TST: Add tests to check the actual output on the console.

IPython/frontend/qt/console/tests/test_console_widget.py

@@ -0,0 +1,40 b''
+# Standard library imports
+import unittest
+
+# System library imports
+from IPython.external.qt import QtGui
+
+# Local imports
+from IPython.frontend.qt.console.console_widget import ConsoleWidget
+
+
+class TestConsoleWidget(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        """ Create the application for the test case.
+        """
+        cls._app = QtGui.QApplication([])
+        cls._app.setQuitOnLastWindowClosed(False)
+
+    @classmethod
+    def tearDownClass(cls):
+        """ Exit the application.
+        """
+        QtGui.QApplication.quit()
+
+    def test_special_characters(self):
+        """ Are special characters displayed correctly?
+        """
+        w = ConsoleWidget()
+        cursor = w._get_prompt_cursor()
+
+        test_inputs = ['xyz\b\b=\n', 'foo\b\nbar\n', 'foo\b\nbar\r\n', 'abc\rxyz\b\b=']
+        expected_outputs = [u'x=z\u2029', u'foo\u2029bar\u2029', u'foo\u2029bar\u2029', 'x=z']
+        for i, text in enumerate(test_inputs):
+            w._insert_plain_text(cursor, text)
+            cursor.select(cursor.Document)
+            selection = cursor.selectedText()
+            self.assertEquals(expected_outputs[i], selection)
+            # clear all the text
+            cursor.insertText('')