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When you need to test your code for thread safety, what do you do?
That's right, you just don't test it.
That's [wrong](https://www.yegor256.com/2018/03/27/how-to-test-thread-safety.html)!
This simple gem helps you test your code with just two additional lines of code.

First, install it:

```bash
$ gem install threads
```

Then, use it like this, to test your code from multiple concurrently running threads:

```ruby
require 'threads'
Threads.new(5).assert do |i|
  puts "Hello from the thread no.#{i}"
end
```

You can put whatever you want into the block. The code will be executed from five threads, concurrently.
You can also make sure the code block runs only a specific number of times
specifying the argument in the `assert` method (it can't be smaller than the amount of threads):

```ruby
require 'threads'
Threads.new(5).assert(20) do |i, r|
  puts "Hello from the thread no.#{i}, repetition no.#{r}"
end
```

That's it.

# How to contribute

Read [these guidelines](https://www.yegor256.com/2014/04/15/github-guidelines.html).
Make sure you build is green before you contribute
your pull request. You will need to have [Ruby](https://www.ruby-lang.org/en/) 2.3+ and
[Bundler](https://bundler.io/) installed. Then:

```
$ bundle update
$ rake
```

If it's clean and you don't see any error messages, submit your pull request.

# License

(The MIT License)

Copyright (c) 2018 Yegor Bugayenko

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the 'Software'), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.