tests/testthat/_snaps/expect-inheritance.md

In testthat: Unit Testing for R

expect_s[34]_class can check not S3/S4

factor() is an S3 object

A() is an S4 object

test_s4_class respects class hierarchy

C() inherits from 'C'/'A'/'B'/'list'/'vector' not 'D'.

test_s3_class respects class hierarchy

`x` inherits from 'a'/'b' not 'c'.

`x` inherits from 'a'/'b' not 'c'/'d'.

checks its inputs

Code
  expect_s7_class(1, 1)
Condition
  Error in `expect_s7_class()`:
  ! `class` must be an S7 class object, not the number 1.

can check with actual class

Foo() inherits from <Foo> not <Bar>.

Baz() inherits from <Baz>/<Foo> not <Bar>.

testthat documentation built on April 4, 2025, 1:08 a.m.