Move constant above class body

lib/mutant/runner/config.rb

@@ -5,6 +5,9 @@ module Mutant
     # Runner for object config
     class Config < self
 
+      # The expected coverage precision
+      COVERAGE_PRECISION = 1
+
       register Mutant::Config
 
       # Run runner for object
@@ -40,8 +43,6 @@ module Mutant
       end
       memoize :failed_subjects
 
-      COVERAGE_PRECISION = 1
-
       # Test if run was successful
       #
       # @return [true]