with_mock: Mock functions in a package.

In testthat: Unit Testing for R

Mock functions in a package.

Description

with_mock() and local_mock() are now defunct, and can be replaced by with_mocked_bindings() and local_mocked_bindings(). These functions only worked by abusing of R's internals.

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.

testthat documentation built on Nov. 25, 2025, 5:09 p.m.