tests/testthat/test-options.R

In stressaddition: Modelling Tri-Phasic Concentration-Response Relationships

# Copyright (C) 2020  Helmholtz-Zentrum fuer Umweltforschung GmbH - UFZ
# See file inst/COPYRIGHTS for details.
#
# This file is part of the R package stressaddition.
#
# stressaddition 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/>.


test_that("user options are not permanently changed by ecxsys()", {
    # drc::drm() messes with the options and fails to return them to their
    # previous values. And options are temporarily modified in ecxsys(). This
    # test checks if all options are returned to their values from before
    # calling ecxsys().

    # This problem becomes visible only if the user changes the default options:
    options(show.error.messages = FALSE)  #  default is TRUE
    options(warn = 1)  # default is 0
    on.exit(options(warn = 0))

    original_options <- options()
    model <- ecxsys(
        concentration = c(0, 0.05, 0.5, 5, 30),
        hormesis_concentration = 0.5,
        survival_tox_observed = c(90, 81, 92, 28, 0),
        survival_tox_env_observed = c(29, 27, 33, 5, 0)
    )
    new_options <- options()

    # When doing devtools::check() some additional options may get added while
    # running the model. So limit the equality testing to the option names which
    # were there originally.
    expect_identical(original_options, new_options[names(original_options)])
})