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## Overview
MSpec is a specialized framework that is syntax-compatible with RSpec 2 for
basic things like `describe`, `it` blocks and `before`, `after` actions.
MSpec contains additional features that assist in writing specs for
Ruby implementations in [ruby/spec](https://github.com/ruby/spec).
MSpec attempts to use the simplest Ruby language features so that beginning
Ruby implementations can run the Ruby specs. For example, no file from the
standard library or RubyGems is necessary to run MSpec.
MSpec is not intended as a replacement for RSpec. MSpec attempts to provide a
subset of RSpec's features in some cases and a superset in others. It does not
provide all the matchers, for instance.
However, MSpec provides several extensions to facilitate writing the Ruby
specs in a manner compatible with multiple Ruby implementations.
1. MSpec offers a set of guards to control execution of the specs. These
guards not only enable or disable execution but also annotate the specs
with additional information about why they are run or not run.
2. MSpec provides a different shared spec implementation specifically
designed to ease writing specs for the numerous aliased methods in Ruby.
3. MSpec provides various helper methods to simplify some specs, for
example, creating temporary file names.
4. MSpec has several specialized runner scripts that includes a
configuration facility with a default project file and user-specific
overrides.
5. MSpec support "tagging", that is excluding specs known as failing on
a particular Ruby implementation, and automatically adding and removing tags
while running the specs.
## Requirements
MSpec requires Ruby 2.5 or more recent.
## Bundler
A Gemfile is provided. Use Bundler to install gem dependencies. To install
Bundler, run the following:
```bash
gem install bundler
```
To install the gem dependencies with Bundler, run the following:
```bash
ruby -S bundle install
```
## Development
Use RSpec to run the MSpec specs. There are no plans currently to make the
MSpec specs runnable by MSpec: https://github.com/ruby/mspec/issues/19.
After installing the gem dependencies, the specs can be run as follows:
```bash
ruby -S bundle exec rspec
```
To run an individual spec file, use the following example:
```bash
ruby -S bundle exec rspec spec/helpers/ruby_exe_spec.rb
```
## Documentation
See [CONTRIBUTING.md](https://github.com/ruby/spec/blob/master/CONTRIBUTING.md) in ruby/spec
for a list of matchers and how to use `mspec`.
## Source Code
See https://github.com/ruby/mspec
## License
See the LICENSE in the source code.
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