R: Create a test.

test_that {testthat} | R Documentation

## Create a test.

### Description

A test encapsulates a series of expectations about small, self-contained set of functionality. Each test is contained in a context and contains multiple expectations.

### Usage

    test_that(desc, code)

### Arguments

`desc` | test name. Names should be kept as brief as possible, as they are often used as line prefixes.
`code` | test code containing expectations

### Details

Tests are evaluated in their own environments, and should not affect global state.

When run from the command line, tests return `NULL` if all expectations are met, otherwise it raises an error.

### Examples

    test_that("trigonometric functions match identities", {
      expect_equal(sin(pi / 4), 1 / sqrt(2))
      expect_equal(cos(pi / 4), 1 / sqrt(2))
      expect_equal(tan(pi / 4), 1)
    })
    # Failing test:
    ## Not run:
    test_that("trigonometric functions match identities", {
      expect_equal(sin(pi / 4), 1)
    })

    ## End(Not run)

[Package testthat version 2.0.1 Index]