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textual/tests/snapshot_tests/test_snapshots.py
Dave Pearson 97a5478bd0 Add ContentSwitcher (#1983) 
* Add the basic ContentSwitcher widget

* Docstring tidy

* Add a visible_content property to the ContentSwitcher

* Clarify that children of ContentSwitcher with no IDs get ignored

* Simplify setting the display value

* Add the start of an example ContentSwitcher for the docs

* Tweak the example layout to better fit in small spaces

* Add the content switcher to the API docs

* Add a guide entry for the ContentSwitcher

This one is a wee bit more involved than most other widget entries in the
guide in that it doesn't obviously do anything itself, but needs
developer-input to make it do something useful. As such the outline here
isn't as clean as it could be, but I think it conveys everything necessary
without getting too complicated.

* Add the reactive attribute table to the ContentSwitcher guide

* Update the README

* Add a refresh after everything has been flipped in the switcher

As noted in the code, this should not be necessary and I don't believe it
has anything to do with this code. I would suspect some lower-level issue
with flipping between different widgets within a container. I need to find a
way to make an isolated reproduction that isn't about this particular
widget. Meanwhile though this works with the refresh().

* Swap current from var to reactive

This solves the explicit refresh issue, but only because the refresh is
implied due to the use of a reactive over a var. As such this sort of
addresses #1979 by ignoring the issue rather than diving into it.

I still suspect that I shouldn't need to do this, and that perhaps there's a
refresh issue when you flip display. So I'll keep #1979 kicking around and
at some point see if I can recreate in isolation.

* Add unit tests for the content switcher

* Add snapshot tests for the ContentSwitcher

* Clarify that an exception can be thrown on a bad ID

* Try and help other Pythons

* Add a pause at the end of the second switcher snapshot test

I'm getting a lot of fails in CI; none of them are actual problems.
Hopefully this will cure it.

* Paaaaaaaaause

More of a test than anything else really. My particular snapshot test is
failing but kinda randomly in each environment each time -- sometimes
Windows, sometimes GNU/Linux, different Python versions.

So... yeah, let's try this and see if it makes it through; otherwise I may
need to rethink this.

* New pause

So it turns out that _ doesn't do anything any more; and instead there's a
"wait:<n>" syntax! So let's give that a try.

* Learning my alphabet...

* Fix a typo in the docs.

Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>

* Add missing full stop.

Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>

* Add a missing word

Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>

* Try a longer wait on the switcher

I'm starting to suspect that this doesn't come down to a timing issue;
especially given that the snapshot report seems to be showing some oddity in
the length of the vertical scrollbar. But... I want to be as sure as
possible so let's double the length of the wait.

Bit a bit of me is starting to wonder if I've somehow managed to create the
perfect storm for scrollbars and you don't always get the same result every
time.

Seems unlikely, but if it's not timing it's that or lots of cosmic rays.

* Test a longer pause on the content switcher test

The idea here being that it takes 200ms for the button to pop again.

* Refresh the snapshots

This time. THIS TIME!

* Experiment: is the issue the same name for two tests?

* Experiment: drop the different source files, try terminal size

Having got over the issue of the button not ending up in the same state,
we're stuck with the scrollbar having different sizes. Having tried other
options let's go with tweaking the terminal size.

* Do a little less work when changing current

Rather than set everything invisible then the new one visible, every time
current is changed, instead just make sure everything is invisible up front
and then just swap the affected children each time.

This does mean that if someone messes with the children under the hood they
may see oddness happening, but less work while being less defensive seems
fair here.

---------

Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>
2023-03-09 11:39:30 +00:00

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from os import terminal_size
from pathlib import Path
import pytest
from textual.widgets import Placeholder
# These paths should be relative to THIS directory.
WIDGET_EXAMPLES_DIR = Path("../../docs/examples/widgets")
LAYOUT_EXAMPLES_DIR = Path("../../docs/examples/guide/layout")
STYLES_EXAMPLES_DIR = Path("../../docs/examples/styles")
SNAPSHOT_APPS_DIR = Path("./snapshot_apps")
CLI_PREVIEWS_DIR = Path("../../src/textual/cli/previews")
# --- Layout related stuff ---
def test_grid_layout_basic(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "grid_layout1.py")
def test_grid_layout_basic_overflow(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "grid_layout2.py")
def test_grid_layout_gutter(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "grid_layout7_gutter.py")
def test_layers(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "layers.py")
def test_horizontal_layout(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "horizontal_layout.py")
def test_horizontal_layout_width_auto_dock(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "horizontal_auto_width.py")
def test_vertical_layout(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "vertical_layout.py")
def test_dock_layout_sidebar(snap_compare):
assert snap_compare(LAYOUT_EXAMPLES_DIR / "dock_layout2_sidebar.py")
# --- Widgets - rendering and basic interactions ---
# Each widget should have a canonical example that is display in the docs.
# When adding a new widget, ideally we should also create a snapshot test
# from these examples which test rendering and simple interactions with it.
def test_switches(snap_compare):
"""Tests switches but also acts a regression test for using
width: auto in a Horizontal layout context."""
press = [
"shift+tab",
"enter", # toggle off
"shift+tab",
"wait:20",
"enter", # toggle on
"wait:20",
]
assert snap_compare(WIDGET_EXAMPLES_DIR / "switch.py", press=press)
def test_input_and_focus(snap_compare):
press = [
"tab",
*"Darren", # Focus first input, write "Darren"
"tab",
*"Burns",
"_", # Tab focus to second input, write "Burns"
]
assert snap_compare(WIDGET_EXAMPLES_DIR / "input.py", press=press)
def test_buttons_render(snap_compare):
# Testing button rendering. We press tab to focus the first button too.
assert snap_compare(WIDGET_EXAMPLES_DIR / "button.py", press=["tab"])
def test_placeholder_render(snap_compare):
# Testing the rendering of the multiple placeholder variants and labels.
Placeholder.reset_color_cycle()
assert snap_compare(WIDGET_EXAMPLES_DIR / "placeholder.py")
def test_datatable_render(snap_compare):
press = ["tab", "down", "down", "right", "up", "left", "_"]
assert snap_compare(WIDGET_EXAMPLES_DIR / "data_table.py", press=press)
def test_datatable_row_cursor_render(snap_compare):
press = ["up", "left", "right", "down", "down", "_"]
assert snap_compare(SNAPSHOT_APPS_DIR / "data_table_row_cursor.py", press=press)
def test_datatable_column_cursor_render(snap_compare):
press = ["left", "up", "down", "right", "right", "_"]
assert snap_compare(SNAPSHOT_APPS_DIR / "data_table_column_cursor.py", press=press)
def test_datatable_sort_multikey(snap_compare):
press = ["down", "right", "s"] # Also checks that sort doesn't move cursor.
assert snap_compare(SNAPSHOT_APPS_DIR / "data_table_sort.py", press=press)
def test_datatable_labels_and_fixed_data(snap_compare):
# Ensure that we render correctly when there are fixed rows/cols and labels.
assert snap_compare(SNAPSHOT_APPS_DIR / "data_table_row_labels.py")
def test_footer_render(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "footer.py")
def test_header_render(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "header.py")
def test_list_view(snap_compare):
assert snap_compare(
WIDGET_EXAMPLES_DIR / "list_view.py", press=["tab", "down", "down", "up", "_"]
)
def test_textlog_max_lines(snap_compare):
assert snap_compare("snapshot_apps/textlog_max_lines.py", press=[*"abcde", "_"])
def test_fr_units(snap_compare):
assert snap_compare("snapshot_apps/fr_units.py")
def test_visibility(snap_compare):
assert snap_compare("snapshot_apps/visibility.py")
def test_tree_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "tree.py")
def test_markdown_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "markdown.py")
def test_markdown_viewer_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "markdown_viewer.py")
def test_checkbox_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "checkbox.py")
def test_radio_button_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "radio_button.py")
def test_radio_set_example(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "radio_set.py")
def test_content_switcher_example_initial(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "content_switcher.py")
def test_content_switcher_example_switch(snap_compare):
assert snap_compare(WIDGET_EXAMPLES_DIR / "content_switcher.py", press=[
"tab", "tab", "enter", "wait:500"
], terminal_size=(50, 50))
# --- CSS properties ---
# We have a canonical example for each CSS property that is shown in their docs.
# If any of these change, something has likely broken, so snapshot each of them.
PATHS = [
path.name
for path in (Path(__file__).parent / STYLES_EXAMPLES_DIR).iterdir()
if path.suffix == ".py"
]
@pytest.mark.parametrize("file_name", PATHS)
def test_css_property(file_name, snap_compare):
path_to_app = STYLES_EXAMPLES_DIR / file_name
Placeholder.reset_color_cycle()
assert snap_compare(path_to_app)
def test_multiple_css(snap_compare):
# Interaction between multiple CSS files and app-level/classvar CSS
assert snap_compare("snapshot_apps/multiple_css/multiple_css.py")
def test_order_independence(snap_compare):
assert snap_compare("snapshot_apps/layer_order_independence.py")
def test_order_independence_toggle(snap_compare):
assert snap_compare("snapshot_apps/layer_order_independence.py", press="t,_")
def test_columns_height(snap_compare):
# Interaction with height auto, and relative heights to make columns
assert snap_compare("snapshot_apps/columns_height.py")
def test_offsets(snap_compare):
"""Test offsets of containers"""
assert snap_compare("snapshot_apps/offsets.py")
def test_nested_auto_heights(snap_compare):
"""Test refreshing widget within a auto sized container"""
assert snap_compare("snapshot_apps/nested_auto_heights.py", press=["1", "2", "_"])
def test_programmatic_scrollbar_gutter_change(snap_compare):
"""Regression test for #1607 https://github.com/Textualize/textual/issues/1607
See also tests/css/test_programmatic_style_changes.py for other related regression tests.
"""
assert snap_compare(
"snapshot_apps/programmatic_scrollbar_gutter_change.py", press=["s"]
)
# --- CLI Preview Apps ---
# For our CLI previews e.g. `textual easing`, `textual colors` etc, we have snapshots
def test_borders_preview(snap_compare):
assert snap_compare(CLI_PREVIEWS_DIR / "borders.py", press=["tab", "enter"])
def test_colors_preview(snap_compare):
assert snap_compare(CLI_PREVIEWS_DIR / "colors.py")
def test_easing_preview(snap_compare):
assert snap_compare(CLI_PREVIEWS_DIR / "easing.py")
def test_keys_preview(snap_compare):
assert snap_compare(CLI_PREVIEWS_DIR / "keys.py", press=["a", "b"])
# --- Other ---
def test_key_display(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "key_display.py")
def test_demo(snap_compare):
"""Test the demo app (python -m textual)"""
assert snap_compare(
Path("../../src/textual/demo.py"),
press=["down", "down", "down"],
terminal_size=(100, 30),
)
def test_label_widths(snap_compare):
"""Test renderable widths are calculate correctly."""
assert snap_compare(SNAPSHOT_APPS_DIR / "label_widths.py")
def test_border_alpha(snap_compare):
"""Test setting a border alpha."""
assert snap_compare(SNAPSHOT_APPS_DIR / "border_alpha.py")
def test_auto_width_input(snap_compare):
assert snap_compare(
SNAPSHOT_APPS_DIR / "auto_width_input.py", press=["tab", *"Hello"]
)
def test_screen_switch(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "screen_switch.py", press=["a", "b"])
def test_disabled_widgets(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "disable_widgets.py")
def test_focus_component_class(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "focus_component_class.py", press=["tab"])
def test_line_api_scrollbars(snap_compare):
assert snap_compare(SNAPSHOT_APPS_DIR / "line_api_scrollbars.py", press=["_"])
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