Add small interactive test scripts

test_scripts/display_attr_text_widget.py

@@ -0,0 +1,20 @@
+import urwid
+import urwid.curses_display
+
+import cheuph
+from cheuph import AT, AttributedTextWidget
+
+
+class TestWidget(urwid.WidgetWrap):
+    def __init__(self):
+        text = AT("Hello world!\nThis is some text.\nThird line.")
+        self.text = AttributedTextWidget(text)
+        self.filler = urwid.Filler(self.text)
+        super().__init__(self.filler)
+
+def main():
+    screen = urwid.curses_display.Screen()
+    loop = urwid.MainLoop(TestWidget(), screen=screen)
+    loop.run()
+
+main()