context("formula") # Creation ---------------------------------------------------------------- test_that("env must be an environment", { expect_error(f_new(quote(a), env = list()), "must be an environment") }) test_that("equivalent to ~", { f1 <- ~abc f2 <- f_new(quote(abc)) expect_identical(f1, f2) }) test_that("is_formula works", { expect_true(is_formula(~10)) expect_false(is_formula(10)) }) # Getters ----------------------------------------------------------------- test_that("throws errors for bad inputs", { expect_error(f_rhs(1), "not a formula") expect_error(f_rhs(`~`()), "Invalid formula") expect_error(f_rhs(`~`(1, 2, 3)), "Invalid formula") expect_error(f_lhs(1), "not a formula") expect_error(f_lhs(`~`()), "Invalid formula") expect_error(f_lhs(`~`(1, 2, 3)), "Invalid formula") expect_error(f_env(1), "not a formula") }) test_that("extracts call, name, or scalar", { expect_identical(f_rhs(~ x), quote(x)) expect_identical(f_rhs(~ f()), quote(f())) expect_identical(f_rhs(~ 1L), 1L) }) # Setters ----------------------------------------------------------------- test_that("can replace RHS of one-sided formula", { f <- ~ x1 f_rhs(f) <- quote(x2) expect_equal(f, ~ x2) }) test_that("can replace both sides of two-sided formula", { f <- x1 ~ y1 f_lhs(f) <- quote(x2) f_rhs(f) <- quote(y2) expect_equal(f, x2 ~ y2) }) test_that("can remove lhs of two-sided formula", { f <- x ~ y f_lhs(f) <- NULL expect_equal(f, ~ y) }) test_that("can modify environment", { f <- x ~ y env <- new.env() f_env(f) <- env expect_equal(f_env(f), env) })
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