Nothing
test_that("ts_default works", {
df0 <- ts_df(ts_c(mdeaths, fdeaths))
# non-default colnames
colnames(df0) <- c("id", "date", "count")
# switch back to default colnames
df <- ts_default(df0)
expect_identical(colnames(df), c("id", "time", "value"))
})
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