"""
This example demonstrates how to test a simple application using UI Tester.

The GUI being tested is written in the demo under the same name (minus the
preceding 'test') in the outer directory.
"""

import os
import runpy
import unittest

from traitsui.testing.api import (
    DisplayedText, KeyClick, KeySequence, MouseClick, UITester
)

#: Filename of the demo script
FILENAME = "converter.py"

#: Path of the demo script
DEMO_PATH = os.path.join(os.path.dirname(__file__), "..", FILENAME)


class TestConverter(unittest.TestCase):
    def test_converter(self):
        demo = runpy.run_path(DEMO_PATH)["popup"]
        tester = UITester()
        with tester.create_ui(demo) as ui:
            input_amount = tester.find_by_name(ui, "input_amount")
            output_amount = tester.find_by_name(ui, "output_amount")
            for _ in range(4):
                input_amount.perform(KeyClick("Backspace"))
            input_amount.perform(KeySequence("14.0"))
            self.assertEqual(
                output_amount.inspect(DisplayedText())[:4],
                "1.16",
            )
            tester.find_by_id(ui, "Undo").perform(MouseClick())
            self.assertEqual(
                output_amount.inspect(DisplayedText()),
                "1.0",
            )


# Run the test(s)
unittest.TextTestRunner().run(
    unittest.TestLoader().loadTestsFromTestCase(TestConverter)
)
