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# Ruby Hacking Guide
This document gives some helpful instructions which should make your experience as a Ruby core developer easier.
## Configure Ruby
It's generally advisable to use a build directory.
./autogen.sh
mkdir build
cd build
../configure --prefix $HOME/.rubies/ruby-head
make -j16 install
### Without Documentation
If you are frequently building Ruby, this will reduce the time it takes to `make install`.
../configure --disable-install-doc
## Running Ruby
### Run Local Test Script
You can create a file in the Ruby source root called `test.rb`. You can build `miniruby` and execute this script:
make -j16 run
If you want more of the standard library, you can use `runruby` instead of `run`.
### Run Bootstrap Tests
There are a set of tests in `bootstraptest/` which cover most basic features of the core Ruby language.
make -j16 test
### Run Extensive Tests
There are extensive tests in `test/` which cover a wide range of features of the Ruby core language.
make -j16 test-all
You can run specific tests by specifying their path:
make -j16 test-all TESTS=../test/fiber/test_io.rb
### Run RubySpec Tests
RubySpec is a project to write a complete, executable specification for the Ruby programming language.
make -j16 test-all test-rubyspec
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