Nothing

```
# library(testthat); devtools::load_all()
context("environments")
test_that("grow() loads from an environment", {
expect_error(1 %myfun% 1)
expect_equal(functions(), character(0))
e = new.env()
expect_equal(functions(e), character(0))
e$myfun = function(x, y) x + y
expect_equal(functions(e), "myfun")
expect_equal(bunch(e), character(0))
expect_warning(grow(myfun))
expect_error(1 %myfun% 1)
grow(myfun, from = e)
expect_equal(1 %myfun% 1, 2)
grow(myfun, from = e, to = e)
expect_equal(functions(e), "myfun")
expect_equal(bunch(e), "%myfun%")
})
test_that("grow() assigns in an environment", {
expect_error(1 %myfun% 1)
e = new.env()
e$x = "some_object"
e$y = new.env()
e$myfun = function(x, y) x + y
expect_warning(grow(myfun))
expect_error(1 %myfun% 1)
e2 = new.env()
e2$z = "nope"
expect_equal(ls(e2), "z")
grow(myfun, from = e, to = e2)
expect_equal(ls(e2), c("%myfun%", "z"))
out = eval(parse(text = "1 %myfun% 1"), envir = e2)
expect_equal(out, 2)
expect_equal(functions(e), "myfun")
expect_equal(bunch(e), character(0))
expect_equal(functions(e2), character(0))
expect_equal(bunch(e2), "%myfun%")
})
```

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