R: Expectation: is the object true/false?

is_true {testthat}

R Documentation

Expectation: is the object true/false?

Description

These are fall-back expectations that you can use when none of the other more specific expectations apply. The disadvantage is that you may get a less informative error message.

Usage

is_true()

expect_true(object, info = NULL, label = NULL)

is_false()

expect_false(object, info = NULL, label = NULL)

Arguments

`object`	object to test
`info`	extra information to be included in the message (useful when writing tests in loops).
`label`	object label. When `NULL`, computed from deparsed object.

Details

Attributes are ignored.

Other expectations: equals_reference, expect_equal_to_reference; equals, expect_equal; expect-compare, expect_less_than, expect_more_than, is_less_than, is_more_than; expect_equivalent, is_equivalent_to; expect_error, throws_error; expect_identical, is_identical_to; expect_is, is_a; expect_match, matches; expect_message, shows_message; expect_named, has_names; expect_null, is_null; expect_output, prints_text; expect_warning, gives_warning; takes_less_than

Examples

expect_true(2 == 2)
# Failed expectations will throw an error
## Not run: 
expect_true(2 != 2)

## End(Not run)
expect_true(!(2 != 2))
# or better:
expect_false(2 != 2)

a <- 1:3
expect_true(length(a) == 3)
# but better to use more specific expectation, if available
expect_equal(length(a), 3)