In my Elixir/Phoenix app, when I run
mix test
I get output like:
$ mix test
....
Finished in 0.09 seconds
4 tests, 0 failures
with dots for each test that succeeded.
How do I output the names of the tests that succeed instead?
In Rails with rspec I used to do this with a .rspec file in the directory that looked like:
$ cat .rspec
--color
-fd
--tty
Is there an equivalent in Elixir?
To print the names of the passing tests, you can pass --trace argument to mix test. For example, here's the output of mix test --trace on the current master branch of httpoison package:
$ mix test --trace
HTTPoisonTest
Starting HTTParrot on port 8080
Starting HTTParrot on port 8433 (SSL)
Starting HTTParrot on unix socket httparrot.sock
* test post binary body (97.1ms)
* test https scheme (57.8ms)
* test option follow redirect relative url (4.0ms)
* test option follow redirect absolute url (2.6ms)
* test put (0.6ms)
* test request headers as a map (0.5ms)
* test get (1.5ms)
* test head (0.5ms)
* test delete (1.5ms)
* test asynchronous redirected get request (2.3ms)
* test send cookies (4.9ms)
* test post charlist body (0.7ms)
* test patch (0.5ms)
* test post form data (0.6ms)
* test exception (6.0ms)
* test get with params (2.8ms)
* test asynchronous request (0.5ms)
* test explicit http scheme (0.5ms)
* test put without body (0.8ms)
* test multipart upload (8.5ms)
* test options (0.5ms)
* test basic_auth hackney option (1.6ms)
* test http+unix scheme (4.4ms)
* test asynchronous request with explicit streaming using [async: :once] (304.1ms)
* test cached request (2.1ms)
* test post streaming body (3.8ms)
* test char list URL (0.7ms)
HTTPoisonBaseTest
* test request body using ExampleDefp (124.1ms)
* test passing ssl option (110.9ms)
* test passing connect_timeout option (109.9ms)
* test passing recv_timeout option (103.4ms)
* test passing proxy option (106.6ms)
* test passing follow_redirect option (105.3ms)
* test passing proxy option with proxy_auth (106.9ms)
* test request raises error tuple (104.9ms)
* test passing max_redirect option (115.6ms)
* test request body using Example (111.6ms)
Finished in 2.0 seconds
37 tests, 0 failures
Randomized with seed 264353
You can also set this option to true by default by changing the ExUnit.start line in test_helper.exs:
ExUnit.start(trace: true)
If you want completely custom output, you can implement your own formatter (see https://github.com/elixir-lang/elixir/blob/master/lib/ex_unit/lib/ex_unit/cli_formatter.ex for an example; that's the default formatter) and configure ExUnit to use it:
ExUnit.start(formatters: [YourFormatterModule])
--trace is the option you're looking for: https://hexdocs.pm/mix/Mix.Tasks.Test.html
Hope that helps!
