Fix maximum line length rule

config/mutant.yml

@@ -1,7 +1,6 @@
 ---
 name: yardstick
 namespace: Yardstick
-expect_coverage: 2365/2366
 ignore_subjects:
 # sometimes creates a neutral failure
 - Yardstick::Rake::Measurement#define

lib/yardstick/rules/summary.rb

@@ -34,9 +34,9 @@ def valid?
       # Checks that method summary length doesn't go over 80 characters
       #
       class Length < Rule
-        MAXIMUM_LINE_LENGTH = 80
+        MAXIMUM_LINE_LENGTH = 79
 
-        self.description = 'The method summary should be less than 80 characters in length'
+        self.description = 'The method summary should be less than or equal to 79 characters in length'
 
         # @see class description
         #

spec/integration/yardstick/processor/process_string_spec.rb

@@ -10,7 +10,7 @@
 
   let(:valid_method) do
     (<<-RUBY)
-      # This is a method summary that is the maximum --- exactly 80 characters in length
+      # This is a method summary that is the maximum -- exactly 79 characters in length
       #
       # @example
       #   test('Hello World')  # => nil
@@ -83,21 +83,21 @@ def measurement(description)
     end
   end
 
-  describe 'with a method summary that is 80 characters in length' do
+  describe 'with a method summary that is 79 characters in length' do
     let(:method) { valid_method }
 
     it { should be_kind_of(Yardstick::MeasurementSet) }
 
     it 'has a correct measurement' do
-      expect(measurement('The method summary should be less than 80 characters in length'))
+      expect(measurement('The method summary should be less than or equal to 79 characters in length'))
         .to be_ok
     end
   end
 
   describe 'with a method summary that is 81 characters in length' do
     let(:method) do
       (<<-RUBY)
-        # This is a method summary greater than the maximum - it is 81 characters in length
+        # This is a method summary greater than the maximum - it is precisely 80 characters
         def test(value)
         end
       RUBY
@@ -106,7 +106,7 @@ def test(value)
     it { should be_kind_of(Yardstick::MeasurementSet) }
 
     it 'has an incorrect measurement' do
-      expect(measurement('The method summary should be less than 80 characters in length'))
+      expect(measurement('The method summary should be less than or equal to 79 characters in length'))
         .to_not be_ok
     end
   end