Add parser round trip test to CI

.github/workflows/ci.yml

@@ -63,6 +63,22 @@ jobs:
         bundler-cache: true
         ruby-version: ${{ matrix.ruby }}
     - run: bundle exec bin/corpus
+  ruby-integration-spec:
+    name: Parser Round Trip Tests
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ruby-2.6, ruby-2.7, ruby-3.0]
+        os: [macos-latest, ubuntu-latest]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+        ruby-version: ${{ matrix.ruby }}
+    - run: bundle exec ruby bin/parser-round-trip-test
   ruby-rubocop:
     name: Rubocop
     runs-on: ${{ matrix.os }}

Changelog.md

@@ -4,6 +4,10 @@
 
 * Fix emit of of `match_pattern` vs `match_pattern_p`
 
+[#298](https://github.com/mbj/unparser/pull/298)
+
+* Add round trip tests dynamically derived from the `parser` gems test suite to CI
+
 # v0.6.3 2022-01-16
 
 [#290](https://github.com/mbj/unparser/pull/290)

test/run-parser-tests.rb → bin/parser-round-trip-test

@@ -1,6 +1,8 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
 require 'unparser'
 
-$: << __dir__
+$: << Pathname.new(__dir__).parent.join('test')
 
 testBuilder = Class.new(Parser::Builders::Default)
 testBuilder.modernize
@@ -26,8 +28,6 @@ class Test
     :rubies
   )
 
-  TARGET_RUBIES = %w[2.6 2.7]
-
   EXPECT_FAILURE = {}.freeze
 
   def legacy_attributes
@@ -56,7 +56,7 @@ def expect_failure?
   end
 
   def allow_ruby?
-    rubies.empty? || rubies.any?(TARGET_RUBIES.method(:include?))
+    rubies.empty? || rubies.include?(RUBY_VERSION)
   end
 
   def right(value)
@@ -65,7 +65,9 @@ def right(value)
 
   def validation
     identification   = name.to_s
+
     generated_source = Unparser.unparse_either(node)
+      .fmap { |string| string.dup.force_encoding(parser_source.encoding).freeze }
 
     generated_node = generated_source.lmap{ |_value| }.bind do |source|
       parse_either(source, identification)