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# ert-async.el
This library provides the function `ert-deftest-async`, which works
just like `ert-deftest`, except that it works for async tests.
## Installation
Add this to get font locking for `ert-deftest-async`:
```lisp
(remove-hook 'emacs-lisp-mode-hook 'ert--activate-font-lock-keywords)
(add-hook 'emacs-lisp-mode-hook 'ert-async-activate-font-lock-keywords)
```
## Usage
The function `ert-deftest-async` works just like `ert-deftest`, except
that the `callbacks` argument is a list of callback functions. Unless
all functions has been called before `ert-async-timeout` seconds, the
test fails.
An example. When the function `async-call` callbacks, the functions
`done-1` and `done-2` are called.
```lisp
(ert-deftest-async my-async-test (done-1 done-2)
(async-call-1 done-1)
(async-call-2 done-2))
```
Note that if a callback function is called with a string as argument,
the test will fail with that error string. So if the function
`async-call` above callbacks with an argument, the test would have to
be written as:
```lisp
(ert-deftest-async my-async-test (done-1 done-2)
(async-call-1 (lambda () (funcall done-1)))
(async-call-2 (lambda () (funcall done-2))))
```
Passing a string as argument to a callback function can be useful when
you don't want a function to callback, for example:
```lisp
(ert-deftest-async my-async-test (done)
(async-call
(lambda ()
(funcall done "should not callback, but did")))
(funcall done))
```
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