[](https://hex.pm/packages/maxo_test_iex)
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[](https://hex.pm/packages/maxo_test_iex)
[](https://github.com/maxohq/maxo_test_iex/blob/main/LICENSE)
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# TestIex
TestIex is an interactive ExUnit test runner, that provides following features:
- Easy to learn:
- the public API consists of 3 functions:
- TestIex.run(matcher // "")
- TestIex.run(matcher, line)
- TestIex.watch(matcher // "")
- TestIex.watch(matcher, line)
- TestIex.unwatch()
- Rapid feedback:
- since there is no re-incurring cost of starting an OS process with Elixir + Mix + your code for every run
- With sensible defaults:
- you won't have to spend a lot of time to get it configured. Default configs provide great experience for the majority of Elixir projects
- Usable
- File event de-duplication during watch mode means you only run tests once, even if there are rapid multiple consecutive file events for a single file
- Robust
- it does code recompilation + loading of tests in a predictable manner
- Flexible:
- should you have some special needs, there are config options to tune.
- they are all conveniently kept in a single module [TestIex.Config](https://github.com/maxohq/maxo_test_iex/blob/main/lib/test_iex/config.ex).
- heck, you could even swap the TestIex.Core module, if desired! It exposes only 3 public functions:
- start()
- test(files)
- test(file, line)
- Inspectable
- you can turn on debug logs to see what happens
- this helps you to narrow down issues with your configuration
- Support for test file co-location:
- it comes with support for co-located ExUnit tests out of the box!
- Examples of real-life projects using co-located test files
- https://github.com/maxohq/maxo_adapt/blob/main/lib/maxo_adapt_test.exs
- To configure co-located test you'll need to adjust following files
- https://github.com/maxohq/maxo_adapt/blob/main/mix.exs (test_paths, test_pattern)
- create a test helper in `lib`: https://github.com/maxohq/maxo_adapt/blob/main/lib/test_helper.exs
- Now you're running!
- This pattern is very common in Golang / JS / TypeScript and we think it should be also more common in the Elixir community.
- Low - tech:
- it does not require a particular editor extension or similar. Just simple Elixir + ExUnit in your terminal.
- your workflow wont have to change in future, since the foundation for TestIex is very stable:
- ExUnit + file system watching + Iex
- Maintainable:
- since it requires very little code, it's very easy to maintain and adjust on new Elixir releases
- the core is in [TestIex.Core](https://github.com/maxohq/maxo_test_iex/blob/main/lib/test_iex/core.ex).
- It is less than 40 lines of Elixir code with lots of docs.
- besides it does not have any hairy GenServer logic and also has no ambitions to grow more features and become more complex
- by not supporting umbrella projects, we keep the code complexity much lower
- every Elixir project is considered to be in a single root folder with
following directories under it:
- `lib`
- `test`
Please give it a try and see if you like it!
## Usage
```elixir
$ MIX_ENV=test iex -S mix
# Run all tests
iex> TestIex.run
# Run all matching files
iex> TestIex.run("word")
# Run test on line 45 for the first matching file
iex> TestIex.run("word", 45)
# Run test on line 45 for the first matching file
iex> TestIex.run("users_test.exs:45")
# Run test on line 45 for the first matching file
iex> TestIex.run("users:45")
# Watching on file changes and re-running tests.
# Currently only .ex / .exs files in `lib` or `test` folders trigger a re-run.
iex> TestIex.watch("users:45")
# Reset watching
iex> TestIex.unwatch()
```
## Configuration
```elixir
# in config/runtime.exs
import Config
if config_env() == :test do
# for default values look into:
# - https://github.com/maxohq/maxo_test_iex/blob/main/lib/test_iex/config.ex
# NO need to watch for tests on CI
if System.get_env("CI"), do: config :maxo_test_iex, watcher_enable: false
# how long multiple consecutive events on the same file should be considered duplicates?
config :maxo_test_iex, watcher_dedup_timeout: 500
# which file changes should trigger a test re-run?
config :maxo_test_iex, watcher_args: [dirs: ["lib/", "test/"], latency: 0]
# which file extensions are relevant to trigger a test re-run?
config :maxo_test_iex, watcher_extensions: [".ex", ".exs"]
# should we log debug messages?
config :maxo_test_iex, debug: false
end
```
## Installation
```elixir
def deps do
[
{:maxo_test_iex, "~> 0.1", only: [:test]},
]
end
```
## Alternatives
- https://hex.pm/packages/test_iex (the core is take from this project and was extended / improved)
- https://hex.pm/packages/tix
- https://hex.pm/packages/mix_test_watch
- https://hex.pm/packages/mix_test_interactive
- https://github.com/marciol/mix_test_iex
- https://hex.pm/packages/mr_t
