textual/tests/input/test_input_validation.py

import pytest

from textual import on
from textual.app import App, ComposeResult
from textual.validation import Number, ValidationResult
from textual.widgets import Input


class InputApp(App):
    def __init__(self, validate_on=None):
        super().__init__()
        self.messages = []
        self.validator = Number(minimum=1, maximum=5)
        self.validate_on = validate_on

    def compose(self) -> ComposeResult:
        yield Input(
            validators=self.validator,
            validate_on=self.validate_on,
        )

    @on(Input.Changed)
    @on(Input.Submitted)
    def on_changed_or_submitted(self, event):
        self.messages.append(event)


async def test_input_changed_message_validation_failure():
    app = InputApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)
        input.value = "8"
        await pilot.pause()
        assert len(app.messages) == 1
        assert app.messages[0].validation_result == ValidationResult.failure(
            failures=[
                Number.NotInRange(
                    value="8",
                    validator=app.validator,
                    description="Must be between 1 and 5.",
                )
            ],
        )


async def test_input_changed_message_validation_success():
    app = InputApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)
        input.value = "3"
        await pilot.pause()
        assert len(app.messages) == 1
        assert app.messages[0].validation_result == ValidationResult.success()


async def test_input_submitted_message_validation_failure():
    app = InputApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)
        input.value = "8"
        await input.action_submit()
        await pilot.pause()
        assert len(app.messages) == 2
        assert app.messages[1].validation_result == ValidationResult.failure(
            failures=[
                Number.NotInRange(
                    value="8",
                    validator=app.validator,
                    description="Must be between 1 and 5.",
                )
            ],
        )


async def test_input_submitted_message_validation_success():
    app = InputApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)
        input.value = "3"
        await input.action_submit()
        await pilot.pause()
        assert len(app.messages) == 2
        assert app.messages[1].validation_result == ValidationResult.success()


async def test_on_blur_triggers_validation():
    app = InputApp()
    async with app.run_test() as pilot:
        input = app.query_one(Input)
        input.focus()
        input.value = "3"
        input.remove_class("-valid")
        app.set_focus(None)
        await pilot.pause()
        assert input.has_class("-valid")


@pytest.mark.parametrize(
    "validate_on",
    [
        set(),
        {"blur"},
        {"submitted"},
        {"blur", "submitted"},
        {"fried", "garbage"},
    ],
)
async def test_validation_on_changed_should_not_happen(validate_on):
    app = InputApp(validate_on)
    async with app.run_test() as pilot:
        # sanity checks
        assert len(app.messages) == 0
        input = app.query_one(Input)
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")

        input.value = "3"
        await pilot.pause()
        assert len(app.messages) == 1
        assert app.messages[-1].validation_result is None
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")


@pytest.mark.parametrize(
    "validate_on",
    [
        set(),
        {"blur"},
        {"changed"},
        {"blur", "changed"},
        {"fried", "garbage"},
    ],
)
async def test_validation_on_submitted_should_not_happen(validate_on):
    app = InputApp(validate_on)
    async with app.run_test() as pilot:
        # sanity checks
        assert len(app.messages) == 0
        input = app.query_one(Input)
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")

        await input.action_submit()
        await pilot.pause()
        assert len(app.messages) == 1
        assert app.messages[-1].validation_result is None
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")


@pytest.mark.parametrize(
    "validate_on",
    [
        set(),
        {"submitted"},
        {"changed"},
        {"submitted", "changed"},
        {"fried", "garbage"},
    ],
)
async def test_validation_on_blur_should_not_happen_unless_specified(validate_on):
    app = InputApp(validate_on)
    async with app.run_test() as pilot:
        # sanity checks
        input = app.query_one(Input)
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")

        input.focus()
        await pilot.pause()
        app.set_focus(None)
        await pilot.pause()
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")


async def test_none_validate_on_means_all_validations_happen():
    app = InputApp(None)
    async with app.run_test() as pilot:
        assert len(app.messages) == 0  # sanity checks
        input = app.query_one(Input)
        assert not input.has_class("-valid")
        assert not input.has_class("-invalid")

        input.value = "3"
        await pilot.pause()
        assert len(app.messages) == 1
        assert app.messages[-1].validation_result is not None
        assert input.has_class("-valid")

        input.remove_class("-valid")

        await input.action_submit()
        await pilot.pause()
        assert len(app.messages) == 2
        assert app.messages[-1].validation_result is not None
        assert input.has_class("-valid")

        input.remove_class("-valid")

        input.focus()
        await pilot.pause()
        app.set_focus(None)
        await pilot.pause()
        assert input.has_class("-valid")