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test_that("can subset with regexps", {
x <- c("a", "b", "c")
expect_equal(str_subset(x, "a|c"), c("a", "c"))
expect_equal(str_subset(x, "a|c", negate = TRUE), "b")
})
test_that("can subset with fixed patterns", {
expect_equal(str_subset(c("i", "I"), fixed("i")), "i")
expect_equal(
str_subset(c("i", "I"), fixed("i", ignore_case = TRUE)),
c("i", "I")
)
# negation works
expect_equal(str_subset(c("i", "I"), fixed("i"), negate = TRUE), "I")
})
test_that("str_which is equivalent to grep", {
expect_equal(
str_which(head(letters), "[aeiou]"),
grep("[aeiou]", head(letters))
)
# negation works
expect_equal(
str_which(head(letters), "[aeiou]", negate = TRUE),
grep("[aeiou]", head(letters), invert = TRUE)
)
})
test_that("can use fixed() and coll()", {
expect_equal(str_subset(c("x", "."), fixed(".")), ".")
expect_equal(str_subset(c("i", "\u0131"), turkish_I()), "\u0131")
})
test_that("can't use boundaries", {
expect_snapshot(error = TRUE, {
str_subset(c("a", "b c"), "")
str_subset(c("a", "b c"), boundary())
})
})
test_that("keep names", {
fruit <- c(A = "apple", B = "banana", C = "pear", D = "pineapple")
expect_identical(names(str_subset(fruit, "b")), "B")
expect_identical(names(str_subset(fruit, "p")), c("A", "C", "D"))
expect_identical(names(str_subset(fruit, "x")), as.character())
})
test_that("str_subset() preserves names of retained elements", {
x <- c(C = "3", B = "2", A = "1")
out <- str_subset(x, "[12]")
expect_equal(names(out), c("B", "A"))
})
test_that("str_subset() never matches missing values", {
expect_equal(str_subset(c("a", NA, "b"), "."), c("a", "b"))
expect_identical(str_subset(NA_character_, "."), character(0))
})
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