Add configuration of corpus test integrations

spec/integration/mutant/corpus_spec.rb

@@ -8,7 +8,7 @@ RSpec.describe 'Mutant on ruby corpus', mutant: false do
   end
 
   MutantSpec::Corpus::Project::ALL.select(&:mutation_coverage).each do |project|
-    specify "#{project.name} does have expected mutation coverage" do
+    specify "#{project.name} (#{project.integration}) does have expected mutation coverage" do
       project.verify_mutation_coverage
     end
   end

spec/integrations.yml

@@ -3,6 +3,7 @@
   namespace: Rubyspec
   repo_uri: 'https://github.com/ruby/rubyspec.git'
   repo_ref: 'origin/master'
+  integration: mspec
   ruby_glob_pattern: '**/*_spec.rb'
   mutation_coverage: false
   mutation_generation: true
@@ -24,6 +25,7 @@
   namespace: Regexp
   repo_uri: 'https://github.com/ammar/regexp_parser.git'
   repo_ref: 'v1.2.0'
+  integration: rspec
   ruby_glob_pattern: '**/*.rb'
   mutation_coverage: false
   mutation_generation: true
@@ -34,6 +36,7 @@
   repo_uri: 'https://github.com/mbj/auom.git'
   repo_ref: 'origin/master'
   ruby_glob_pattern: '**/*.rb'
+  integration: rspec
   mutation_coverage: true
   mutation_generation: true
   expected_errors: {}
@@ -43,6 +46,7 @@
   repo_uri: 'https://github.com/dkubb/axiom.git'
   repo_ref: 'origin/master'
   ruby_glob_pattern: '**/*.rb'
+  integration: rspec
   mutation_coverage: false
   mutation_generation: true
   expected_errors: {}

spec/support/corpus.rb

@@ -37,6 +37,7 @@ module MutantSpec
         :expected_errors,
         :mutation_coverage,
         :mutation_generation,
+        :integration,
         :name,
         :namespace,
         :repo_uri,
@@ -59,7 +60,7 @@ module MutantSpec
             system(
               %W[
                 bundle exec mutant
-                --use rspec
+                --use #{integration}
                 --include lib
                 --require #{name}
                 #{namespace}*
@@ -315,6 +316,7 @@ module MutantSpec
                 s(:key_symbolize, :ruby_glob_pattern,   s(:guard, s(:primitive, String))),
                 s(:key_symbolize, :name,                s(:guard, s(:primitive, String))),
                 s(:key_symbolize, :namespace,           s(:guard, s(:primitive, String))),
+                s(:key_symbolize, :integration,         s(:guard, s(:primitive, String))),
                 s(:key_symbolize, :mutation_coverage,
                   s(:guard, s(:or, s(:primitive, TrueClass), s(:primitive, FalseClass)))),
                 s(:key_symbolize, :mutation_generation,