A test encapsulates a series of expectations about a small, self-contained
set of functionality. Each test lives in a file and contains multiple
expectations, like `expect_equal()`

or `expect_error()`

.

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

## Arguments

- desc
Test name. Names should be brief, but evocative. They are only used by humans, so do you

- code
Test code containing expectations. Braces (

`{}`

) should always be used in order to get accurate location data for test failures.

## 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)
})
#> Test passed 🌈
if (FALSE) {
test_that("trigonometric functions match identities", {
expect_equal(sin(pi / 4), 1)
})
}
```