test_that("stop_on_error stops on error", {
expect_error(stop_on_error(exit_code = 0), NA)
expect_error(stop_on_error(exit_code = -1), NA)
expect_error(stop_on_error(exit_code = 1), "error")
expect_error(stop_on_error(exit_code = 99), "error")
})
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