tests/testthat/test-window.R In dplyr: A Grammar of Data Manipulation

```context("Window functions")

test_that("If n = 0, lead and lag return x", {
expect_equal(lag(1:2, 0), 1:2)
})

test_that("If n = length(x), returns all missing", {
miss <- rep(NA_integer_, 2)

expect_equal(lag(1:2, 2), miss)
})

test_that("cumany and cumall handle NAs consistently (#408, #3749, #4132)", {
batman <- c(NA, NA, NA, NA, NA)
expect_true(all(is.na(cumany(batman))))
expect_true(all(is.na(cumall(batman))))

# normal usecases
expect_identical(
cumall(c(TRUE, NA, FALSE, NA)),
c(TRUE, NA, FALSE, FALSE)
)

expect_identical(
cumall(c(FALSE, NA, TRUE)),
c(FALSE, FALSE, FALSE)
)

expect_identical(
cumall(c(NA, TRUE)),
c(NA, NA)
)

expect_identical(
cumall(c(NA, FALSE)),
c(NA, FALSE)
)

expect_identical(
cumany(c(TRUE, NA, FALSE)),
c(TRUE, TRUE, TRUE)
)

expect_identical(
cumany(c(FALSE, NA, TRUE)),
c(FALSE, NA, TRUE)
)

# scalars
expect_true(is.na(cumall(NA)))
expect_true(is.na(cumany(NA)))
expect_true(cumall(TRUE))
expect_false(cumall(FALSE))
expect_true(cumany(TRUE))
expect_false(cumany(FALSE))

# degenerate cases
expect_identical(
cumall(logical()),
logical()
)

expect_identical(
cumany(logical()),
logical()
)

# behaviour of degenerate logical vectors mimics that of base R functions
x <- as.raw(c(2L, 9L, 0L))
class(x) <- "logical"
expect_identical(cumall(x), x == TRUE)
expect_identical(cumany(x), c(TRUE, TRUE, TRUE))
})

test_that("percent_rank ignores NAs (#1132)", {
expect_equal(percent_rank(c(1:3, NA)), c(0, 0.5, 1, NA))
})

test_that("cume_dist ignores NAs (#1132)", {
expect_equal(cume_dist(c(1:3, NA)), c(1 / 3, 2 / 3, 1, NA))
})

test_that("cummean is not confused by FP error (#1387)", {
a <- rep(99, 9)
expect_true(all(cummean(a) == a))
})

test_that("order_by() returns correct value", {
expected <- int(15, 14, 12, 9, 5)
expect_identical(order_by(5:1, cumsum(1:5)), expected)

x <- 5:1
y <- 1:5
expect_identical(order_by(x, cumsum(y)), expected)
})

test_that("order_by() works in arbitrary envs (#2297)", {
env <- child_env("base")
expect_equal(
with_env(env, dplyr::order_by(5:1, cumsum(1:5))),
rev(cumsum(rev(1:5)))
)
expect_equal(
order_by(5:1, cumsum(1:5)),
rev(cumsum(rev(1:5)))
)
})

test_that("order_by() fails when not supplied a call (#3065)", {
expect_error(order_by(NULL, !!1L), "`call` must be a function call, not an integer vector")
})
```

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dplyr documentation built on July 4, 2019, 5:08 p.m.