Nothing

```
# library(testthat); devtools::load_all()
context("packages")
test_that("grow() loads from a package", {
expect_error(1 %knit_params% 2)
expect_error(knit_params(1, 2))
expect_error(ls("package:knitr"))
grow(knit_params, from = "knitr")
expect_equal(1 %knit_params% 2, knit_params(1, 2))
out = ls("package:knitr")
expect_true(length(out) > 0)
detach("package:knitr")
})
test_that("grow() can load everything from a package", {
expect_error(1 %knit_params% 2)
expect_equal(bunch(), character(0))
grow(from = "knitr")
expect_equal(1 %knit_params% 2, knit_params(1, 2))
expect_true(length(bunch()) > 2)
envir = as.environment("package:knitr")
expect_equal(intersect(bunch(), functions()), character(0))
expect_equal(intersect(bunch(), functions("knitr")), character(0))
expect_equal(intersect(bunch("knitr"), functions()), character(0))
expect_equal(intersect(bunch("knitr"), functions("knitr")), character(0))
for(op in bunch())
expect_true(is.function(environment()[[op]]))
for(f in functions("knitr"))
expect_true(is.function(envir[[f]]))
detach("package:knitr")
})
```

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