testthat (version 0.6)

is_true: Expectation: is the object true?

Description

This is a fall-back expectation 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)

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.

See Also

is_false for complement

Other expectations: equals, expect_equal, expect_equivalent, expect_error, expect_false, expect_identical, expect_is, expect_match, expect_message, expect_output, expect_warning, gives_warning, is_a, is_equivalent_to, is_false, is_identical_to, matches, prints_text, shows_message, takes_less_than, throws_error

Examples

expect_that(2 == 2, is_true())
expect_true(2 == 2)
# Failed expectations will throw an error
expect_that(2 != 2, is_true())
expect_that(!(2 != 2), is_true())
# or better:
expect_that(2 != 2, is_false())

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