* begin implementing ui.get to query elements

* type hinting, getting all elements and __repr__

* set style, classes, props with ui.get()

* introduce .within filter

* more stable test

* element.keys(..) + ui.get(key=...)

* allow setting multiple keys for ui.get

* allow filtering ui.get(..).within(key=..)

* allow multiple keys in ui.get

* testing ui.get with TextElement

* allow filtering with `ui.get(text=...)`

* ui.get(..).exclude(type=..., key=..., text=...)

* introduce ui.get().not_within(...)

* add documentation page and use_local_scope param

* fixed default

* ui.get within elements

* Enhance test example to show how to test with routing.
Also rename pytest example to integration_tests to not have name-collisions

* first proof of concept for simulated screen

* demo async test

* fix click in simulated screen

* simulated screen can now handle async pages

* do module reloading through pytest marker

* determine whether to use simulation screen or selenium screen

* rename Screen to SeleniumScreen to better pair it with SimulatedScreen

* docstrings

* custom marker

* first concept of detecting failures on event loop

* checking exceptions in other thread

* use same event loop for tests and app which simplifies things a lot

* show content of simulated screen on failure

* simulating sio handshake to test for connection

* notes

* provide pytest plugin and ensure SimulatedScreen does not load Selenium fixtures

* remove pytest.ini

* better description for pytest marker

* ensure fixtures are run when using screen

* ensure loop is closed

* cleanup

* fixed async warning by making selenium_screen fixture non-async

* start testing the chat app example

* test typing into chat app

* fix test

* cleanup

* ignore test_ files when building link examples

* python 3.8 compatibility

* re-adding tests/conftest.py because nicegui itself does not benefit from the newly provided pytest plugin

* for testing we need to manage multiple clients in the same asyncio task

* use __init__.py and relative import to get right main module

* element tests without screen need to explicitly reset globals

* keep original stack behaviour if we do not simulate

* rename ui.get to ui.find

* rename element.tags to element.markers

* refactored ui.find into ElementFilter which serves as  foundation for new user.should_see(...)

* better naming and fixed documentation

* cleanup

* increased is-displayed delay

* do multiple checks for visibility

* adapt tests to use SeleniumScreen

* use configurable url

* allow subclasses of screen fixtures

* clear urls and reset on_air for each test

* cleanup

* registering signals does not work in pytests

* user.should_see is now async

* warn if its not a nicegui page

* print markers

* provide check if code is executed in pytest

* support storage in simulated screen

* dropped simulated screen concept to make one user visit multiple pages (for example via ui.navigate.to)

* re-add typing capabilities

* check for notifications

* fix ui.navigate.to for simulation

* renaming

* fix excluding_text test

* make conftest generally available (like the examples)

* cleanup

* fix usage of context

* support for auto-index-pages

* click checkbox toggles value in simulation

* fix "Self" import

* make fixtures available via pytest plugin

* adapted new tests to new structure

* ensure utf-8

* try latest pytest

* use newly named screen class

* update dependencies

* restore original ui.navigate.to after we exit simulated user

* fix logging and types

* fix type hint for python 3.8

* fix users fixture in combination with ui.navigate.to

* try with longer timeout

* only prepare auto index client for simulation if the user fixture is chosen

* analyze core.loop issue with failing tests

* Revert "analyze core.loop issue with failing tests"

This reverts commit 725965c.

* only assert loop is closed if it has been created
because some tests may exit without calling screen.open()

* better naming

* renaming function and files

* renaming

* cleanup

* add user.should_not_see and user.trigger methods

* add integration tests for todo list example

* icon prop is content

* fix typing

* return self

* add integration tests for authentication example
this uncovered the need to get new context in every retry to handle page changes

* allow clicking on links in user simulation

* always stop server

* add link to example

* remove accidentally commited env file

* renaming

* improve check if we are running as pytest

* add typehint

* remove obsolete try/except

* remove obsolete code (may have been here due to bad merge conflict resolving)

* cleanup

* reload run module between tests to fix it on GitHub Action

* introduction of UserFocus to trigger events

* using non-async user.focus to simplify API

* add user.focus(...).click()

* updated tests to use new user.focus for interaction

* formatting

* reset to main version

* adapted auth tests

* make Self available for lower python versions

* provide overloaded methods to simplify API

* renaming and more simplifications

* better imports

* fix import Self

* renaming

* code review

* add back requirements.txt

* code review

* rework str output shown on a failing test

* fix some typing issues

* remove obsolete test

* simplify test_multiple_pages

* update element filter tests to use User instead of Screen

* fix tests by resetting default attributes for elements

* Use ui.notification for ui.notify to simplify user simulation tests (#3369)

* use ui.notification for ui.notify to simplify user simulation tests

* code review

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* Use `Set` in user._gather_elements and improve typing (#3370)

* use set in user._gather_elements and improve typing

* code review

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* code review for Element.__str__

* simplify mark()

* Fix typing for ElementFilter and User (#3381)

* improve typing and naming

* fix typing

* reverted "kind" and type T of ElementFilter

* fix element filter type inference

* fix typing in __next__

* ignore typing where it can not be matched

* open page

* code review

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* Implement full `ui.navigate` functionality for user simulation (#3382)

* make ui.navigate an object of a replaceable class to simplify and improve user simulation

* provide ui.navigate.reload for user simulation

* code review

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* Make combining multiple content filters more robust (#3383)

* make ui.navigate an object of a replaceable class to simplify and improve user simulation

* provide ui.navigate.reload for user simulation

* make combining multiple content filters more robust

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* fix problem with `ui.navigate` on documentation page

* move element filter documentation to styling and appearance

* fix ui.open

* pylint

* try removing explicit response.encoding

* add user interaction with ui.switch, ui.editor and ui.codemirror

* Improve iteration of elements (#3385)

* make ui.navigate an object of a replaceable class to simplify and improve user simulation

* provide ui.navigate.reload for user simulation

* make combining multiple content filters more robust

* introduce element.ancestors and element.descendants

* rewrite __iter__ (tests still failing)

* fix typo

* improve filter

* fix another condition

* fix deletion of elements

* replace tee with list for efficiency

* add some more tests and fix conditions

* remove len and getitem

---------

Co-authored-by: Rodja Trappe <rodja@zauberzeug.com>

* improve type annotation

* extend docstring

* fix rule for ancestor kinds

* refactor element filter tests

* fix link to example folder

* more consistent rules

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* update filter rules and re-organize element filter tests

* add test which combines multiple "within" statements

* demonstrate validity of having multiple elements for a singe within clause

* pytest configuration & fixtures (#3411)

* remove pytest-prefix from plugin specification

* fix requirements and settings for pytests example

* rename screen and user with prefix nicegui_

* add conftest with renaming to pytests example

* add internal renaming of nicegui_screen to screen and nicegui_user to user

* remove unused pylint ignore

* fix rename in examples

* remove entry point

* remove renaming

* remove renaming in examples

* remove renaming fixtures and add example code

* double quotes

* reworked as described in docs (#3413)

* add pytest plugin loading to examples

* run the pytest examples as part of the test_startup.sh to avoid conflicts in setup

* renamed the pytest plugin from fixtures.py to plugin.py

* fix todo tests

* rename folder

---------

Co-authored-by: Rodja Trappe <rodja@zauberzeug.com>
Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* remove redundant test

* add multi-user navigation test

* Add documentation of pytest fixtures and pytest configuration (#3413)

* begin with documentation of fixtures and pytest setup

* code review

* also prepare simulation for screen fixture

* replace hacky docs.pytest and Demo.raw with generic docs.part

* better split of testing topics in the docs

* improve user docs

* add UserInteraction reference

* review

* simplify doc.part

* fix storage test

* web driver info

* review

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>

* add conftest.py for backward compatibility

* remove activate() and deactivate()

---------

Co-authored-by: Falko Schindler <falko@zauberzeug.com>
Co-authored-by: Paula Kammler <paula@zauberzeug.com>