context("Callback") test_that("request callback", { f <- function(req) req$url old <- set_callback("request", f) on.exit(set_callback("request", old)) expect_identical(GET("foo.bar"), "foo.bar") expect_identical(f, get_callback("request")) expect_identical(f, set_callback("request", old)) expect_identical(old, get_callback("request")) })
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