add rubocop in dev and test env

.rubocop.yml

@@ -0,0 +1 @@
+inherit_from: .rubocop_todo.yml

.rubocop_todo.yml

@@ -0,0 +1,309 @@
+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2019-10-03 01:19:12 -0300 using RuboCop version 0.75.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: TreatCommentsAsGroupSeparators, Include.
+# Include: **/*.gemfile, **/Gemfile, **/gems.rb
+Bundler/OrderedGems:
+  Exclude:
+    - 'Gemfile'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyleAlignWith.
+# SupportedStylesAlignWith: either, start_of_block, start_of_line
+Layout/BlockAlignment:
+  Exclude:
+    - 'spec/monkeypatch/array_spec.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+    - 'spec/monkeypatch/object_spec.rb'
+    - 'spec/monkeypatch/set_spec.rb'
+    - 'spec/monkeypatch/single_value_spec.rb'
+    - 'spec/safe/class_method_spec.rb'
+    - 'spec/safe/extend_spec.rb'
+    - 'spec/safe/stats_spec.rb'
+
+# Offense count: 2
+# Cop supports --auto-correct.
+Layout/EmptyLineAfterGuardClause:
+  Exclude:
+    - 'lib/descriptive_statistics/percentile.rb'
+    - 'lib/descriptive_statistics/support/convert.rb'
+
+# Offense count: 48
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, no_empty_lines
+Layout/EmptyLinesAroundBlockBody:
+  Exclude:
+    - 'lib/descriptive_statistics/refinement.rb'
+    - 'spec/monkeypatch/array_spec.rb'
+    - 'spec/monkeypatch/empty_collection_spec.rb'
+    - 'spec/monkeypatch/enumerable_spec.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+    - 'spec/monkeypatch/object_spec.rb'
+    - 'spec/monkeypatch/set_spec.rb'
+    - 'spec/monkeypatch/single_value_spec.rb'
+    - 'spec/refinement/refinement_spec.rb'
+    - 'spec/safe/class_method_spec.rb'
+    - 'spec/safe/extend_spec.rb'
+    - 'spec/safe/stats_spec.rb'
+
+# Offense count: 3
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines, beginning_only, ending_only
+Layout/EmptyLinesAroundClassBody:
+  Exclude:
+    - 'lib/descriptive_statistics/class_methods.rb'
+    - 'test/test.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLinesAroundExceptionHandlingKeywords:
+  Exclude:
+    - 'Rakefile'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+Layout/EmptyLinesAroundMethodBody:
+  Exclude:
+    - 'lib/descriptive_statistics/refinement.rb'
+
+# Offense count: 13
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines
+Layout/EmptyLinesAroundModuleBody:
+  Exclude:
+    - 'lib/descriptive_statistics/class_methods.rb'
+    - 'lib/descriptive_statistics/enumerable_extension.rb'
+    - 'lib/descriptive_statistics/refinement.rb'
+    - 'lib/descriptive_statistics/stats.rb'
+    - 'lib/descriptive_statistics/support/convert.rb'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: Width, IgnoredPatterns.
+Layout/IndentationWidth:
+  Exclude:
+    - 'spec/monkeypatch/array_spec.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+    - 'spec/monkeypatch/object_spec.rb'
+    - 'spec/monkeypatch/set_spec.rb'
+    - 'spec/monkeypatch/single_value_spec.rb'
+    - 'spec/safe/class_method_spec.rb'
+    - 'spec/safe/extend_spec.rb'
+    - 'spec/safe/stats_spec.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+Layout/SpaceAfterColon:
+  Exclude:
+    - 'spec/refinement/refinement_spec.rb'
+
+# Offense count: 125
+# Cop supports --auto-correct.
+Layout/SpaceAfterComma:
+  Exclude:
+    - 'lib/descriptive_statistics/percentile.rb'
+    - 'spec/monkeypatch/array_spec.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+    - 'spec/monkeypatch/set_spec.rb'
+    - 'spec/refinement/refinement_spec.rb'
+    - 'spec/safe/class_method_spec.rb'
+    - 'spec/safe/extend_spec.rb'
+    - 'spec/safe/stats_spec.rb'
+    - 'test/test.rb'
+
+# Offense count: 12
+# Cop supports --auto-correct.
+# Configuration parameters: AllowForAlignment.
+Layout/SpaceAroundOperators:
+  Exclude:
+    - 'lib/descriptive_statistics/variance.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+
+# Offense count: 16
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceBeforeBlockBraces:
+  Exclude:
+    - 'spec/monkeypatch/object_spec.rb'
+    - 'spec/refinement/refinement_spec.rb'
+
+# Offense count: 32
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces, SpaceBeforeBlockParameters.
+# SupportedStyles: space, no_space
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideBlockBraces:
+  Exclude:
+    - 'spec/monkeypatch/object_spec.rb'
+    - 'spec/refinement/refinement_spec.rb'
+
+# Offense count: 6
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
+# SupportedStyles: space, no_space, compact
+# SupportedStylesForEmptyBraces: space, no_space
+Layout/SpaceInsideHashLiteralBraces:
+  Exclude:
+    - 'spec/monkeypatch/hash_spec.rb'
+    - 'spec/refinement/refinement_spec.rb'
+
+# Offense count: 8
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: space, no_space
+Layout/SpaceInsideParens:
+  Exclude:
+    - 'spec/monkeypatch/object_spec.rb'
+
+# Offense count: 18
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: final_newline, final_blank_line
+Layout/TrailingBlankLines:
+  Enabled: false
+
+# Offense count: 4
+Lint/IneffectiveAccessModifier:
+  Exclude:
+    - 'lib/descriptive_statistics/support/convert.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods.
+Lint/UnusedMethodArgument:
+  Exclude:
+    - 'lib/descriptive_statistics/support/convert.rb'
+
+# Offense count: 1
+# Configuration parameters: ContextCreatingMethods, MethodCreatingMethods.
+Lint/UselessAccessModifier:
+  Exclude:
+    - 'lib/descriptive_statistics/support/convert.rb'
+
+# Offense count: 3
+Metrics/AbcSize:
+  Max: 67
+
+# Offense count: 24
+# Configuration parameters: CountComments, ExcludedMethods.
+# ExcludedMethods: refine
+Metrics/BlockLength:
+  Max: 167
+
+# Offense count: 4
+# Configuration parameters: CountComments, ExcludedMethods.
+Metrics/MethodLength:
+  Max: 15
+
+# Offense count: 2
+# Configuration parameters: MinNameLength, AllowNamesEndingInNumbers, AllowedNames, ForbiddenNames.
+# AllowedNames: io, id, to, by, on, in, at, ip, db
+Naming/UncommunicativeMethodParamName:
+  Exclude:
+    - 'lib/descriptive_statistics/percentile.rb'
+    - 'lib/descriptive_statistics/percentile_rank.rb'
+
+# Offense count: 2
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: inline, group
+Style/AccessModifierDeclarations:
+  Exclude:
+    - 'lib/descriptive_statistics/class_methods.rb'
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, IgnoredMethods, AllowBracesOnProceduralOneLiners.
+# SupportedStyles: line_count_based, semantic, braces_for_chaining, always_braces
+# ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
+# FunctionalMethods: let, let!, subject, watch
+# IgnoredMethods: lambda, proc, it
+Style/BlockDelimiters:
+  Exclude:
+    - 'spec/monkeypatch/object_spec.rb'
+
+# Offense count: 10
+# Cop supports --auto-correct.
+Style/ColonMethodCall:
+  Exclude:
+    - 'lib/descriptive_statistics/mean.rb'
+    - 'lib/descriptive_statistics/median.rb'
+    - 'lib/descriptive_statistics/mode.rb'
+    - 'lib/descriptive_statistics/number.rb'
+    - 'lib/descriptive_statistics/percentile.rb'
+    - 'lib/descriptive_statistics/percentile_rank.rb'
+    - 'lib/descriptive_statistics/range.rb'
+    - 'lib/descriptive_statistics/standard_deviation.rb'
+    - 'lib/descriptive_statistics/sum.rb'
+    - 'lib/descriptive_statistics/variance.rb'
+
+# Offense count: 16
+Style/Documentation:
+  Enabled: false
+
+# Offense count: 36
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: always, never
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+# Offense count: 29
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+# SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+Style/HashSyntax:
+  Exclude:
+    - 'Gemfile'
+    - 'lib/descriptive_statistics/descriptive_statistics.rb'
+    - 'spec/monkeypatch/hash_spec.rb'
+
+# Offense count: 4
+# Cop supports --auto-correct.
+# Configuration parameters: AllowMultipleReturnValues.
+Style/RedundantReturn:
+  Exclude:
+    - 'lib/descriptive_statistics/descriptive_statistics.rb'
+    - 'lib/descriptive_statistics/percentile_rank.rb'
+    - 'lib/descriptive_statistics/refinement.rb'
+    - 'lib/descriptive_statistics/sum.rb'
+
+# Offense count: 13
+# Cop supports --auto-correct.
+Style/RedundantSelf:
+  Exclude:
+    - 'lib/descriptive_statistics/descriptive_statistics.rb'
+
+# Offense count: 200
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
+# SupportedStyles: single_quotes, double_quotes
+Style/StringLiterals:
+  Enabled: false
+
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: ExactNameMatch, AllowPredicates, AllowDSLWriters, IgnoreClassMethods, Whitelist.
+# Whitelist: to_ary, to_a, to_c, to_enum, to_h, to_hash, to_i, to_int, to_io, to_open, to_path, to_proc, to_r, to_regexp, to_str, to_s, to_sym
+Style/TrivialAccessors:
+  Exclude:
+    - 'lib/descriptive_statistics/class_methods.rb'
+
+# Offense count: 32
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 125

Gemfile

@@ -3,4 +3,8 @@ source "https://rubygems.org"
 gem "rake", :group => :development
 gem "rspec", :group => :test
 gem "simplecov", :require => false, :group => :test
-gem "minitest", :group => :test
+gem "minitest", :group => :test
+
+group :development, :test do
+  gem "rubocop"
+end

Gemfile.lock

@@ -1,10 +1,16 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.4.0)
     diff-lcs (1.2.5)
     docile (1.1.5)
+    jaro_winkler (1.5.3)
     minitest (5.8.4)
     multi_json (1.10.1)
+    parallel (1.17.0)
+    parser (2.6.5.0)
+      ast (~> 2.4.0)
+    rainbow (3.0.0)
     rake (10.4.2)
     rspec (3.1.0)
       rspec-core (~> 3.1.0)
@@ -18,11 +24,20 @@ GEM
     rspec-mocks (3.1.3)
       rspec-support (~> 3.1.0)
     rspec-support (3.1.2)
+    rubocop (0.75.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.6)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 1.7)
+    ruby-progressbar (1.10.1)
     simplecov (0.9.1)
       docile (~> 1.1.0)
       multi_json (~> 1.0)
       simplecov-html (~> 0.8.0)
     simplecov-html (0.8.0)
+    unicode-display_width (1.6.0)
 
 PLATFORMS
   ruby
@@ -31,4 +46,8 @@ DEPENDENCIES
   minitest
   rake
   rspec
+  rubocop
   simplecov
+
+BUNDLED WITH
+   2.0.1