Change meta examples to allow specifying N types

lib/mutant/meta.rb

@@ -18,9 +18,9 @@ module Mutant
       # @return [undefined]
       #
       # rubocop:disable Performance/Caller
-      def self.add(type, &block)
+      def self.add(*types, &block)
         file = caller.first.split(':in', 2).first
-        ALL << DSL.call(file, type, block)
+        ALL << DSL.call(file, Set.new(types), block)
       end
 
       Pathname.glob(Pathname.new(__dir__).parent.parent.join('meta', '*.rb'))

lib/mutant/meta/example.rb

@@ -3,7 +3,7 @@
 module Mutant
   module Meta
     class Example
-      include Adamantium, Anima.new(:file, :node, :node_type, :expected)
+      include Adamantium, Anima.new(:file, :node, :types, :expected)
 
       # Verification instance for example
       #

lib/mutant/meta/example/dsl.rb

@@ -9,9 +9,12 @@ module Mutant
 
         # Run DSL on block
         #
+        # @param [Pathname] file
+        # @param [Set<Symbol>] types
+        #
         # @return [Example]
-        def self.call(file, type, block)
-          instance = new(file, type)
+        def self.call(file, types, block)
+          instance = new(file, types)
           instance.instance_eval(&block)
           instance.example
         end
@@ -21,9 +24,9 @@ module Mutant
         # Initialize object
         #
         # @return [undefined]
-        def initialize(file, type)
+        def initialize(file, types)
           @file     = file
-          @type     = type
+          @types    = types
           @node     = nil
           @expected = []
         end
@@ -37,10 +40,10 @@ module Mutant
         def example
           fail 'source not defined' unless @node
           Example.new(
-            file:      @file,
-            node:      @node,
-            node_type: @type,
-            expected:  @expected
+            file:     @file,
+            node:     @node,
+            types:    @types,
+            expected: @expected
           )
         end
 

meta/regexp.rb

@@ -80,10 +80,3 @@ Pathname
   .glob(Pathname.new(__dir__).join('regexp', '*.rb'))
   .sort
   .each(&Kernel.public_method(:require))
-
-# Re-register examples for all regular expression nodes for node_type `:regexp`
-Mutant::Meta::Example::ALL.each do |example|
-  next unless example.node_type.to_s.start_with?('regexp_')
-
-  Mutant::Meta::Example::ALL << example.with(node_type: :regexp)
-end

meta/regexp/character_types.rb

@@ -12,7 +12,7 @@ mutations = {
 mutations = mutations.merge(mutations.invert)
 
 mutations.each do |(source_type, source_mutation), (_, regexp_mutation)|
-  Mutant::Meta::Example.add source_type do
+  Mutant::Meta::Example.add :regexp, source_type do
     source(source_mutation)
 
     singleton_mutations

spec/unit/mutant/meta/example/dsl_spec.rb

@@ -2,19 +2,19 @@
 
 RSpec.describe Mutant::Meta::Example::DSL do
   describe '.call' do
-    subject { described_class.call(file, type, block) }
+    subject { described_class.call(file, types, block) }
 
-    let(:file)     { 'foo.rb'  }
-    let(:node)     { s(:false) }
-    let(:type)     { node.type }
-    let(:expected) { []        }
+    let(:file)     { 'foo.rb'             }
+    let(:node)     { s(:false)            }
+    let(:types)    { Set.new([node.type]) }
+    let(:expected) { []                   }
 
     let(:expected_example) do
       Mutant::Meta::Example.new(
-        file:      file,
-        node:      node,
-        node_type: type,
-        expected:  expected
+        file:     file,
+        node:     node,
+        types:    types,
+        expected: expected
       )
     end
 

spec/unit/mutant/meta/example/verification_spec.rb

@@ -5,10 +5,10 @@ RSpec.describe Mutant::Meta::Example::Verification do
 
   let(:example) do
     Mutant::Meta::Example.new(
-      file:      'foo.rb',
-      node:      s(:true),
-      node_type: :true,
-      expected:  expected_nodes
+      file:     'foo.rb',
+      node:     s(:true),
+      types:    [:true],
+      expected: expected_nodes
     )
   end
 

spec/unit/mutant/meta/example_spec.rb

@@ -3,10 +3,10 @@
 RSpec.describe Mutant::Meta::Example do
   let(:object) do
     described_class.new(
-      file:      file,
-      node:      node,
-      node_type: node.type,
-      expected:  mutation_nodes
+      file:     file,
+      node:     node,
+      types:    [node.type],
+      expected: mutation_nodes
     )
   end
 

spec/unit/mutant/mutator/node_spec.rb

@@ -1,15 +1,20 @@
 # frozen_string_literal: true
 
-Mutant::Meta::Example::ALL.each.group_by(&:node_type).each do |type, examples|
-  RSpec.describe Mutant::Mutator::REGISTRY.lookup(type) do
-    toplevel_nodes = examples.map { |example| example.node.type }.uniq
+aggregate = Hash.new { |hash, key| hash[key] = [] }
 
-    it "generates the correct mutations on #{toplevel_nodes} toplevel examples" do
+Mutant::Meta::Example::ALL
+  .each_with_object(aggregate) do |example, agg|
+    example.types.each do |type|
+      agg[Mutant::Mutator::REGISTRY.lookup(type)] << example
+    end
+  end
+
+aggregate.each do |mutator, examples|
+  RSpec.describe mutator do
+    it 'generates expected mutations' do
       examples.each do |example|
         verification = example.verification
-        unless verification.success?
-          fail verification.error_report
-        end
+        fail verification.error_report unless verification.success?
       end
     end
   end