Make quoting consistent in the new tests

IPython/html/tests/widgets/widget.js

@@ -183,29 +183,29 casper.notebook_test(function () {
         '    try:',
         '        y = memoryview(x)',
         '    except TypeError:',
-        "        # in python 2, arrays don't support the new buffer protocol",
+        '        # in python 2, arrays do not support the new buffer protocol',
         '        y = memoryview(buffer(x))',
-        "    return y, {'serialization': ('floatArray', 'TestWidget')}",
+        '    return y, {"serialization": ("floatArray", "TestWidget")}',
         'def _memoryview_to_array(x):',
-        "    return array('d', x.tobytes())",
+        '    return array("d", x.tobytes())',
         'arrays_binary = {',
-        "    'from_json': _memoryview_to_array,",
-        "    'to_json': _array_to_memoryview",
+        '    "from_json": _memoryview_to_array,',
+        '    "to_json": _array_to_memoryview',
         '}',
         '',
         'def _array_to_list(x):',
         '    if x is None: return None, {}',
-        "    return list(x), {'serialization': ('floatList', 'TestWidget')}",
+        '    return list(x), {"serialization": ("floatList", "TestWidget")}',
         'def _list_to_array(x):',
-        "    return array('d',x)",
+        '    return array("d",x)',
         'arrays_list = {',
-        "    'from_json': _list_to_array,",
-        "    'to_json': _array_to_list",
+        '    "from_json": _list_to_array,',
+        '    "to_json": _array_to_list',
         '}',
         '',
         'class TestWidget(widgets.DOMWidget):',
-        "    _view_module = Unicode('TestWidget', sync=True)",
-        "    _view_name = Unicode('TestWidget', sync=True)",
+        '    _view_module = Unicode("TestWidget", sync=True)',
+        '    _view_name = Unicode("TestWidget", sync=True)',
         '    array_binary = Instance(array, sync=True, **arrays_binary)',
         '    array_list = Instance(array, sync=True, **arrays_list)',
         '    msg = {}',