expect_not_linter: Require usage of expect_false(x) over expect_true(!x)
Description
testthat::expect_false() exists specifically for testing that an output is
FALSE. testthat::expect_true() can also be used for such tests by
negating the output, but it is better to use the tailored function instead.
The reverse is also true -- use expect_false(A) instead of
expect_true(!A).
# will produce lintslint(
text = "expect_true(!x)",
linters = expect_not_linter()
)
# okaylint(
text = "expect_false(x)",
linters = expect_not_linter()
)