tests/testthat/test-is_almost_constant.R

In nuggets: Extensible Framework for Data Pattern Exploration

#######################################################################
# nuggets: An R framework for exploration of patterns in data
# Copyright (C) 2025 Michal Burda
#
# 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/>.
#######################################################################


test_that("is_almost_constant", {
    expect_true(is_almost_constant(logical(0), na_rm = FALSE))
    expect_true(is_almost_constant(logical(0), na_rm = TRUE))
    expect_true(is_almost_constant(1, na_rm = FALSE))
    expect_true(is_almost_constant(1, na_rm = TRUE))
    expect_true(is_almost_constant("x", na_rm = FALSE))
    expect_true(is_almost_constant("x", na_rm = TRUE))
    expect_true(is_almost_constant(NA, na_rm = FALSE))
    expect_true(is_almost_constant(NA, na_rm = TRUE))

    expect_true(is_almost_constant(rep(TRUE, 5), na_rm = FALSE))
    expect_true(is_almost_constant(rep(TRUE, 5), na_rm = TRUE))
    expect_true(is_almost_constant(rep("x", 5), na_rm = FALSE))
    expect_true(is_almost_constant(rep("x", 5), na_rm = TRUE))
    expect_true(is_almost_constant(rep(1, 5), na_rm = FALSE))
    expect_true(is_almost_constant(rep(1, 5), na_rm = TRUE))
    expect_true(is_almost_constant(rep(NA, 5), na_rm = FALSE))
    expect_true(is_almost_constant(rep(NA, 5), na_rm = TRUE))

    expect_false(is_almost_constant(factor(letters[1:5]), na_rm = FALSE))
    expect_true(is_almost_constant(factor(rep("x", 10), levels = letters), na_rm = FALSE))

    expect_false(is_almost_constant(1:2, na_rm = FALSE))
    expect_false(is_almost_constant(1:2, na_rm = TRUE))
    expect_false(is_almost_constant(1:12, na_rm = FALSE))
    expect_false(is_almost_constant(1:12, na_rm = TRUE))

    expect_false(is_almost_constant(c(rep("x", 5), rep(NA, 5)), na_rm = FALSE))
    expect_true(is_almost_constant(c(rep("x", 5), rep(NA, 5)), na_rm = TRUE))

    expect_true(is_almost_constant(c(rep("x", 11), rep("y", 1)), threshold = 0.9, na_rm = FALSE))
    expect_true(is_almost_constant(c(rep("x", 11), rep("y", 1)), threshold = 0.9, na_rm = TRUE))
    expect_false(is_almost_constant(c(rep("x", 10), rep("y", 2)), threshold = 0.9, na_rm = FALSE))
    expect_false(is_almost_constant(c(rep("x", 10), rep("y", 2)), threshold = 0.9, na_rm = TRUE))

    expect_true(is_almost_constant(c(rep("x", 11), rep(NA, 1)), threshold = 0.9, na_rm = FALSE))
    expect_true(is_almost_constant(c(rep("x", 11), rep(NA, 1)), threshold = 0.9, na_rm = TRUE))
    expect_false(is_almost_constant(c(rep("x", 10), rep(NA, 2)), threshold = 0.9, na_rm = FALSE))
    expect_true(is_almost_constant(c(rep("x", 10), rep(NA, 2)), threshold = 0.9, na_rm = TRUE))

    expect_true(is_almost_constant(c(rep(NA, 11), rep("y", 1)), threshold = 0.9, na_rm = FALSE))
    expect_true(is_almost_constant(c(rep(NA, 11), rep("y", 1)), threshold = 0.9, na_rm = TRUE))
    expect_false(is_almost_constant(c(rep(NA, 10), rep("y", 2)), threshold = 0.9, na_rm = FALSE))
    expect_true(is_almost_constant(c(rep(NA, 10), rep("y", 2)), threshold = 0.9, na_rm = TRUE))

    expect_true(is_almost_constant(c(rep(NA, 10), "x", "y"), threshold = 0.8, na_rm = FALSE))
    expect_false(is_almost_constant(c(rep(NA, 10), "x", "y"), threshold = 0.8, na_rm = TRUE))
})