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test_that("str_interp works with default env", {
subject <- "statistics"
number <- 7
floating <- 6.656
expect_equal(
str_interp("A ${subject}. B $[d]{number}. C $[.2f]{floating}."),
"A statistics. B 7. C 6.66."
)
expect_equal(
str_interp("Pi is approximately $[.5f]{pi}"),
"Pi is approximately 3.14159"
)
})
test_that("str_interp works with lists and data frames.", {
expect_equal(
str_interp(
"One value, ${value1}, and then another, ${value2*2}.",
list(value1 = 10, value2 = 20)
),
"One value, 10, and then another, 40."
)
expect_equal(
str_interp(
"Values are $[.2f]{max(Sepal.Width)} and $[.2f]{min(Sepal.Width)}.",
iris
),
"Values are 4.40 and 2.00."
)
})
test_that("str_interp works with nested expressions", {
amount <- 1337
expect_equal(
str_interp("Works with } nested { braces too: $[.2f]{{{2 + 2}*{amount}}}"),
"Works with } nested { braces too: 5348.00"
)
})
test_that("str_interp works in the absense of placeholders", {
expect_equal(
str_interp("A quite static string here."),
"A quite static string here."
)
})
test_that("str_interp fails when encountering nested placeholders", {
msg <- "This will never see the light of day"
num <- 1.2345
expect_snapshot(error = TRUE, {
str_interp("${${msg}}")
str_interp("$[.2f]{${msg}}")
})
})
test_that("str_interp fails when input is not a character string", {
expect_snapshot(str_interp(3L), error = TRUE)
})
test_that("str_interp wraps parsing errors", {
expect_snapshot(str_interp("This is a ${1 +}"), error = TRUE)
})
test_that("str_interp formats list independetly of other placeholders", {
a_list <- c("item1", "item2", "item3")
other <- "1"
extract <- function(text) regmatches(text, regexpr("xx[^x]+xx", text))
from_list <- extract(str_interp("list: xx${a_list}xx"))
from_both <- extract(str_interp("list: xx${a_list}xx, and another ${other}"))
expect_equal(from_list, from_both)
})
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