Mock functions in a package. — with

with_mock() and local_mock() are superseded in favour of with_mocked_bindings() and local_mocked_bindings().

These works by using some C code to temporarily modify the mocked function in place. This is abusive of R's internals, which makes it dangerous, and no longer recommended.

Usage

with_mock(..., .env = topenv())

local_mock(..., .env = topenv(), .local_envir = parent.frame())

Arguments

...: named parameters redefine mocked functions, unnamed parameters will be evaluated after mocking the functions
.env: the environment in which to patch the functions, defaults to the top-level environment. A character is interpreted as package name.
.local_envir: Environment in which to add exit handler. For expert use only.

Value

The result of the last unnamed parameter

3rd edition

with_mock() and local_mock() are deprecated in the third edition.