Add relational operator mutations

[fix #205]

Changelog.md

@@ -4,7 +4,11 @@
 * Add -j, --jobs flag to control concurrency.
 * Fix blind spots on send with block.
 * Add mutation from `foo { bar }` to `bar`
-* Add mutation from `reverse_merge` to `merge`
+* Add mutation from `#reverse_merge` to `#merge`
+* Add mutation from `#<=` to `#<`, `#==`, `#eql?`, `#equal?`
+* Add mutation from `#>=` to `#>`, `#==`, `#eql?`, `#equal?`
+* Add mutation from `#>` to `#==`, `#eql?`, `#equal?`
+* Add mutation from `#<` to `#==`, `#eql?`, `#equal?`
 * Fix reporting of diff errors to include context [tjchambers]
 
 # v0.5.26 2014-07-07

lib/mutant/mutator/node/send.rb

@@ -23,7 +23,11 @@ module Mutant
           to_s:          [:to_str],
           to_i:          [:to_int],
           to_a:          [:to_ary],
-          :== =>         [:eql?, :equal?]
+          :== =>         [:eql?, :equal?],
+          :>= =>         [:>, :==, :eql?, :equal?],
+          :<= =>         [:<, :==, :eql?, :equal?],
+          :> =>          [:==, :eql?, :equal?],
+          :< =>          [:==, :eql?, :equal?],
         )
 
       private

meta/send.rb

@@ -1,5 +1,67 @@
 # encoding: utf-8
 
+Mutant::Meta::Example.add do
+  source 'a > b'
+
+  singleton_mutations
+  mutation 'a == b'
+  mutation 'a.eql?(b)'
+  mutation 'a.equal?(b)'
+  mutation 'nil > b'
+  mutation 'self > b'
+  mutation 'a > nil'
+  mutation 'a > self'
+  mutation 'a'
+  mutation 'b'
+end
+
+Mutant::Meta::Example.add do
+  source 'a >= b'
+
+  singleton_mutations
+  mutation 'a > b'
+  mutation 'a == b'
+  mutation 'a.eql?(b)'
+  mutation 'a.equal?(b)'
+  mutation 'nil >= b'
+  mutation 'self >= b'
+  mutation 'a >= nil'
+  mutation 'a >= self'
+  mutation 'a'
+  mutation 'b'
+end
+
+Mutant::Meta::Example.add do
+  source 'a <= b'
+
+  singleton_mutations
+  mutation 'a < b'
+  mutation 'a == b'
+  mutation 'a.eql?(b)'
+  mutation 'a.equal?(b)'
+  mutation 'nil <= b'
+  mutation 'self <= b'
+  mutation 'a <= nil'
+  mutation 'a <= self'
+  mutation 'a'
+  mutation 'b'
+end
+
+Mutant::Meta::Example.add do
+  source 'a < b'
+
+  singleton_mutations
+  mutation 'a == b'
+  mutation 'a.eql?(b)'
+  mutation 'a.equal?(b)'
+  mutation 'nil < b'
+  mutation 'self < b'
+  mutation 'a < nil'
+  mutation 'a < self'
+  mutation 'a'
+  mutation 'b'
+end
+
 Mutant::Meta::Example.add do
   source 'reverse_each'
 
@@ -319,7 +381,7 @@ Mutant::Meta::Example.add do
   mutation 'self[*bar]'
 end
 
-(Mutant::AST::Types::BINARY_METHOD_OPERATORS - [:==, :eql?]).each do |operator|
+(Mutant::AST::Types::BINARY_METHOD_OPERATORS - [:<=, :>=, :<, :>, :==, :eql?]).each do |operator|
   Mutant::Meta::Example.add do
     source "true #{operator} false"