testthat (version 3.3.0)

extract_test: Extract a reprex from a failed expectation

Description

extract_test() creates a minimal reprex for a failed expectation. It extracts all non-test code before the failed expectation as well as all code inside the test up to and including the failed expectation.

This is particularly useful when you're debugging test failures in someone else's package.

Usage

extract_test(location, path = stdout(), package = Sys.getenv("TESTTHAT_PKG"))

Value

This function is called for its side effect of rendering a reprex to path. This function will never error: if extraction fails, the error message will be written to path.

Arguments

location

A string giving the location in the form FILE:LINE[:COLUMN].

path

Path to write the reprex to. Defaults to stdout().

package

If supplied, will be used to construct a test environment for the extracted code.

Examples

# If you see a test failure like this:
# -- Failure (test-extract.R:46:3): errors if can't find test -------------
# Expected FALSE to be TRUE.
# Differences:
# `actual`:   FALSE
# `expected`: TRUE

# You can run this:
if (FALSE) extract_test("test-extract.R:46:3")
# to see just the code needed to reproduce the failure