expect_length_linter: Require usage of 'expect_length(x, n)' over...

In lintr: A 'Linter' for R Code

Require usage of expect_length(x, n) over expect_equal(length(x), n)

Description

testthat::expect_length() exists specifically for testing the length() of an object. testthat::expect_equal() can also be used for such tests, but it is better to use the tailored function instead.

Usage

expect_length_linter()

Tags

best_practices, package_development, pkg_testthat, readability

See Also

linters for a complete list of linters available in lintr.

Examples

# will produce lints
lint(
  text = "expect_equal(length(x), 2L)",
  linters = expect_length_linter()
)

# okay
lint(
  text = "expect_length(x, 2L)",
  linters = expect_length_linter()
)

lintr documentation built on April 12, 2025, 1:42 a.m.