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test_that("default extracts last var from data frame", {
df <- memdb_frame(x = 1:3, z = 4:6)
expect_equal(pull(df), 4:6)
})
test_that("can extract by name, or positive/negative position", {
x <- 1:3
df <- memdb_frame(x = x, y = 4:6)
expect_equal(pull(df, x), x)
expect_equal(pull(df, 1L), x)
expect_equal(pull(df, 1), x)
expect_equal(pull(df, -2), x)
expect_equal(pull(df, -2L), x)
})
test_that("extracts correct column from grouped tbl", {
mf <- memdb_frame(id = "a", value = 42)
gf <- mf %>% group_by(id)
expect_equal(pull(mf, value), 42)
})
test_that("doesn't unnecessarily select", {
mf <- memdb_frame(x = c(3, 1, 2))
# no warning about select after arrange
expect_warning(out <- mf %>% arrange(x) %>% pull(), NA)
expect_equal(out, 1:3)
})
test_that("can extract named vectors", {
x <- 1:3
y <- letters[x]
df <- memdb_frame(x = x, y = y)
xn <- set_names(x, y)
expect_equal(pull(df, x), x)
expect_equal(pull(df, x, y), xn)
expect_equal(pull(df, 1, 2), xn)
expect_equal(names(pull(df, x, y)), y)
})
test_that("ungroup() produces nice error messages", {
expect_snapshot(error = TRUE, {
memdb_frame(x = 1) %>% pull(non_existent)
memdb_frame(x = 1) %>% pull("non_existent")
memdb_frame(x = 1) %>% pull(1000)
memdb_frame(x = 1) %>% pull(x, "name_non_existent")
})
})
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