testbed/Textualize__textual/tests/renderables/test_text_opacity.py

import pytest
from rich.text import Text

from tests.utilities.render import render
from textual.renderables.text_opacity import TextOpacity

STOP = "\x1b[0m"


@pytest.fixture
def text():
    return Text("Hello, world!", style="#ff0000 on #00ff00", end="")


def test_simple_text_opacity(text):
    blended_red_on_green = "\x1b[38;2;127;127;0;48;2;0;255;0m"
    assert render(TextOpacity(text, opacity=.5)) == (
        f"{blended_red_on_green}Hello, world!{STOP}"
    )


def test_value_zero_doesnt_render_the_text(text):
    assert render(TextOpacity(text, opacity=0)) == (
        f"\x1b[48;2;0;255;0m             {STOP}"
    )


def test_text_opacity_value_of_one_noop(text):
    assert render(TextOpacity(text, opacity=1)) == render(text)


def test_ansi_colors_noop():
    ansi_colored_text = Text("Hello, world!", style="red on green", end="")
    assert render(TextOpacity(ansi_colored_text, opacity=.5)) == render(ansi_colored_text)


def test_text_opacity_no_style_noop():
    text_no_style = Text("Hello, world!", end="")
    assert render(TextOpacity(text_no_style, opacity=.2)) == render(text_no_style)


def test_text_opacity_only_fg_noop():
    text_only_fg = Text("Hello, world!", style="#ff0000", end="")
    assert render(TextOpacity(text_only_fg, opacity=.5)) == render(text_only_fg)


def test_text_opacity_only_bg_noop():
    text_only_bg = Text("Hello, world!", style="on #ff0000", end="")
    assert render(TextOpacity(text_only_bg, opacity=.5)) == render(text_only_bg)