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# Testing Ruby

All the commands below assume that you’re running them from the `build/` directory made during Building Ruby.

Most commands below should work with GNU make (the default on Linux and macOS), BSD make and NMAKE, except where indicated otherwise.

## Test suites

There are several test suites in the Ruby codebase:

We can run any of the make scripts in parallel to speed them up.

1. bootstraptest/

   This is a small test suite that runs on Miniruby. We can run it with:

       make btest

   To run individual bootstrap tests, we can either specify a list of filenames or use the `--sets` flag in the variable `BTESTS`:

       make btest BTESTS="../bootstraptest/test_string.rb ../bootstraptest/test_class.rb"
       make btest BTESTS="--sets=string,class"

   To run these tests with verbose logging, we can add `-v` to the `OPTS`:

       make btest OPTS="--sets=string,class -v"

   If we want to run the bootstrap test suite on Ruby (not Miniruby), we can use:

       make test

   To run these tests with verbose logging, we can add `-v` to the `OPTS`:

       make test OPTS=-v

   (GNU make only) To run a specific file, we can use:

       make ../test/ruby/test_string.rb

   You can use the `-n` test option to run a specific test with a regex:

       make ../test/ruby/test_string.rb TESTOPTS="-n /test_.*_to_s/"

2. test/

   This is a more comprehensive test suite that runs on Ruby. We can run it with:

       make test-all

   We can run a specific test file or directory in this suite using the `TESTS` option, for example:

       make test-all TESTS="../test/ruby/"
       make test-all TESTS="../test/ruby/test_string.rb"

   We can run a specific test in this suite using the `TESTS` option, specifying first the file name, and then the test name, prefixed with `--name`. For example:

       make test-all TESTS="../test/ruby/test_string.rb --name=TestString#test_to_s"

   To run these tests with verbose logging, we can add `-v` to `TESTS`:

       make test-all TESTS=-v

   We can display the help of the `TESTS` option:

       make test-all TESTS=--help

   We can run all the tests in `test/`, `bootstraptest/` and `spec/` (the `spec/` is explained in a later section) all together with:

       make check

3. spec/ruby

   This is a test suite defined in the Ruby spec repository, and is periodically mirrored into the `spec/ruby` directory of this repository. It tests the behavior of the Ruby programming language. We can run this using:

       make test-spec

   We can run a specific test file or directory in this suite using the `SPECOPTS` option, for example:

       make test-spec SPECOPTS="../spec/ruby/core/string/"
       make test-spec SPECOPTS="../spec/ruby/core/string/to_s_spec.rb"

   To run a specific test, we can use the `--example` flag to match against the test name:

       make test-spec SPECOPTS="../spec/ruby/core/string/to_s_spec.rb --example='returns self when self.class == String'"

   To run these specs with verbose logging, we can add `-v` to the `SPECOPTS`:

       make test-spec SPECOPTS="../spec/ruby/core/string/to_s_spec.rb -Vfs"

   (GNU make only) To run a ruby-spec file or directory, we can use

       make ../spec/ruby/core/string/to_s_spec.rb

4. spec/bundler

   The bundler test suite is defined in the RubyGems repository, and is periodically mirrored into the `spec/ruby` directory of this repository. We can run this using:

       make test-bundler

   To run a specific bundler spec file, we can use `BUNDLER_SPECS` as follows:

       make test-bundler BUNDLER_SPECS=commands/exec_spec.rb

## Troubleshooting

### Running test suites on s390x CPU Architecture

If we see failing tests related to the zlib library on s390x CPU architecture, we can run the test suites with `DFLTCC=0` to pass:

    DFLTCC=0 make check

The failures can happen with the zlib library applying the patch madler/zlib#410 to enable the deflate algorithm producing a different compressed byte stream. We manage this issue at [ruby-core:114942][Bug #19909].