proper handling of snake_case feature files

Rakefile

@@ -11,7 +11,7 @@ end
 
 desc 'Publishes the Gem'
 task :push do
-  sh 'gem push gherkin_lint-0.4.4.gem'
+  sh 'gem push gherkin_lint-0.5.0.gem'
 end
 
 desc 'Checks ruby style'

features/file_name_differs_feature_name.feature

@@ -45,3 +45,31 @@ Feature: File Name Differs Feature Name
       | lint |
       | Lint |
       | LINT |
+
+  Scenario Outline: Valid Example for Snake Case
+    Given a file named "lint.rb" with:
+      """
+      $LOAD_PATH << '../../lib'
+      require 'gherkin_lint'
+
+      linter = GherkinLint::GherkinLint.new
+      linter.enable %w(FileNameDiffersFeatureName)
+      linter.analyze 'lint_test.feature'
+      exit linter.report
+
+      """
+    Given a file named "lint_test.feature" with:
+      """
+      Feature: <name>
+      """
+    When I run `ruby lint.rb lint_test.feature`
+    Then it should pass with exactly:
+      """
+
+      """
+
+    Examples: Valid Names
+      | name      |
+      | lint_test |
+      | lint-test |
+      | lint test |

gherkin_lint.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name        = 'gherkin_lint'
-  s.version     = '0.4.4'
-  s.date        = '2016-08-30'
+  s.version     = '0.5.0'
+  s.date        = '2016-08-31'
   s.summary     = 'Gherkin Lint'
   s.description = 'Lint Gherkin Files'
   s.authors     = ['Stefan Rohe']

lib/gherkin_lint/linter/file_name_differs_feature_name.rb

@@ -7,7 +7,7 @@ def lint
       features do |file, feature|
         next unless feature.include? :name
         expected_feature_name = title_case file
-        next if feature[:name].casecmp(expected_feature_name) == 0
+        next if ignore_whitespaces(feature[:name]).casecmp(ignore_whitespaces(expected_feature_name)) == 0
         references = [reference(file, feature)]
         add_error(references, "Feature name should be '#{expected_feature_name}'")
       end
@@ -17,5 +17,9 @@ def title_case(value)
       value = File.basename(value, '.feature')
       value.split('_').collect(&:capitalize).join(' ')
     end
+
+    def ignore_whitespaces(value)
+      value.delete('-').delete('_').delete(' ')
+    end
   end
 end