How to create expectations in testthat?

Question

How to create expectations in testthat?

A naive approach to writing custom expectations from existing expectations:

expect_between <- function (x, lo, hi) {
    expect_lte(lo, x)
    expect_lte(x, hi)
}

but that doesn't work with expect_failure

since it expect_failure

captures the first wait.

expect_between(0.5, 0, 1)                  # PASSES
expect_between(-99, 0, 1)                  # FAILS
expect_between(99, 0, 1)                   # FAILS
expect_failure(expect_between(-99, 0, 1))  # PASSES
expect_failure(expect_between(99, 0, 1))   # FAILS <--- the problem

What is the correct way to make expectations when writing custom expectations so that they still play well with expect_failure

?

+3

r testthat

fritzo 06 jul. 17 at 17:47

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How to create expectations in testthat?

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