LogarithmPlotter/runtime-pyside6/tests/test_latex.py

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"""
* LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
* Copyright (C) 2021-2024 Ad5001
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
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import pytest
from tempfile import TemporaryDirectory
from shutil import which
from os.path import exists
from re import match
from PySide6.QtGui import QColor
from LogarithmPlotter.util import latex
latex.SHOW_GUI_MESSAGES = False
@pytest.fixture()
def latex_obj():
directory = TemporaryDirectory()
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obj = latex.Latex(directory.name)
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if not obj.checkLatexInstallation():
raise Exception("Cannot run LaTeX tests without a proper LaTeX installation. Make sure to install a LaTeX distribution, DVIPNG, and the calligra package, and run the tests again.")
yield obj
directory.cleanup()
class TestLatex:
def test_check_install(self, latex_obj: latex.Latex) -> None:
assert latex_obj.latexSupported == True
assert latex_obj.checkLatexInstallation() == True
bkp = [latex.DVIPNG_PATH, latex.LATEX_PATH]
# Check what happens when one is missing.
latex.DVIPNG_PATH = None
assert latex_obj.latexSupported == False
assert latex_obj.checkLatexInstallation() == False
latex.DVIPNG_PATH = bkp[0]
latex.LATEX_PATH = None
assert latex_obj.latexSupported == False
assert latex_obj.checkLatexInstallation() == False
# Reset
[latex.DVIPNG_PATH, latex.LATEX_PATH] = bkp
def test_render_sync(self, latex_obj: latex.Latex) -> None:
result = latex_obj.renderSync(r"\frac{d\sqrt{\mathrm{f}(x \times 2.3)}}{dx}", 14, QColor(0, 0, 0, 255))
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# Ensure result format
assert type(result) == str
[path, width, height] = result.split(",")
assert exists(path)
assert match(r"\d+", width)
assert match(r"\d+", height)
# Ensure it returns errors on invalid latex.
with pytest.raises(latex.RenderError):
latex_obj.renderSync(r"\nonexistant", 14, QColor(0, 0, 0, 255))
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# Replace latex bin with one that returns errors
bkp = latex.LATEX_PATH
latex.LATEX_PATH = which("false")
with pytest.raises(latex.RenderError):
latex_obj.renderSync(r"\mathrm{f}(x)", 14, QColor(0, 0, 0, 255))
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latex.LATEX_PATH = bkp
def test_prerendered(self, latex_obj: latex.Latex) -> None:
args = [r"\frac{d\sqrt{\mathrm{f}(x \times 2.3)}}{dx}", 14, QColor(0, 0, 0, 255)]
latex_obj.renderSync(*args)
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prerendered = latex_obj.findPrerendered(*args)
assert type(prerendered) == str
[path, width, height] = prerendered.split(",")
assert exists(path)
assert match(r"\d+", width)
assert match(r"\d+", height)
prerendered2 = latex_obj.findPrerendered(args[0], args[1]+2, args[2])
assert prerendered2 == ""