Validate that certain conditions are true.
validate_that is an alternative to the function
assert_that, that returns a
character vector. This
makes them easier to use within S4
unnamed expressions that describe the
conditions to be tested. Rather than combining
(advanced use only) the environment in which to evaluate the assertions.
character vector if the assertion is false, or
if the assertion is true.
assert_that, which returns an error if the condition
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