Add ability to test master branch to detect regression

Tests for gem will be executed periodically. In this way we can detect
regression in new version of rails and fix it as soon as possible.

There was also update for `rdoc` and version `> 6.2.0` only support ruby
`2.4.0`. I downgraded rdoc for this test suite.

.travis.yml

@@ -6,18 +6,21 @@ matrix:
       gemfile: gemfiles/rails_3.2.gemfile
     - rvm: 2.3.8
       gemfile: gemfiles/rails_4.2.11.gemfile
-    - rvm: 2.6.3
+    - rvm: 2.7
       gemfile: gemfiles/rails_5.2.gemfile
-    - rvm: 2.6.3
+    - rvm: 2.7
       gemfile: gemfiles/rails_6.0.gemfile
-    - rvm: ruby-head
+    - rvm: 2.7
       gemfile: gemfiles/rails_5.2.gemfile
-    - rvm: ruby-head
+    - rvm: 2.7
       gemfile: gemfiles/rails_6.0.gemfile
+    - rvm: 2.7
+      gemfile: gemfiles/rails_master.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/rails_master.gemfile
 before_install:
   - gem update --system
   - gem install bundler
-
 cache:
   - bundler
   - directories:

Appraisals

@@ -12,6 +12,7 @@ appraise "rails-4.2.11" do
   gem "activerecord", "~> 4.2.11"
   gem "activesupport", "~> 4.2.11"
   gem "railties", "~> 4.2.11"
+  gem "rdoc", "6.2.0"
 
   group :development do
     gem 'sqlite3', '~> 1.3.6'
@@ -29,11 +30,23 @@ appraise 'rails-5.2' do
 end
 
 appraise 'rails-6.0' do
-  gem 'activerecord', '~> 6.0.0.rc1'
-  gem 'activesupport', '~> 6.0.0.rc1'
-  gem 'railties', '~> 6.0.0.rc1'
+  gem 'activerecord', '~> 6'
+  gem 'activesupport', '~> 6'
+  gem 'railties', '~> 6'
 
   group :development do
     gem 'sqlite3', '~> 1.4.0'
   end
 end
+
+appraise 'rails-master' do
+  git 'https://github.com/rails/rails.git', branch: :master do
+    gem 'activerecord'
+    gem 'activesupport'
+    gem 'railties'
+  end
+
+  group :development do
+    gem 'sqlite3'
+  end
+end

Gemfile

@@ -1,14 +1,11 @@
 source 'http://rubygems.org'
 
-gem 'activerecord', '>= 3.0.0'
-gem 'activesupport', '>= 3.0.0'
-gem 'ancestry', '>= 1.3.0'
-gem 'railties', '>= 3.0.0'
+gem "ancestry"
 
 group :development do
-  gem 'appraisal'
-  gem 'coveralls', require: false
-  gem 'jeweler'
-  gem 'rspec'
-  gem 'sqlite3'
+  gem "appraisal"
+  gem "coveralls", require: false
+  gem "jeweler"
+  gem "rspec"
+  gem "sqlite3"
 end

Gemfile.lock

@@ -1,65 +1,50 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    actionpack (5.2.3)
-      actionview (= 5.2.3)
-      activesupport (= 5.2.3)
-      rack (~> 2.0)
-      rack-test (>= 0.6.3)
-      rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.2.3)
-      activesupport (= 5.2.3)
-      builder (~> 3.1)
-      erubi (~> 1.4)
-      rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activesupport (5.2.3)
+    activemodel (6.0.2.2)
+      activesupport (= 6.0.2.2)
+    activerecord (6.0.2.2)
+      activemodel (= 6.0.2.2)
+      activesupport (= 6.0.2.2)
+    activesupport (6.0.2.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
+      zeitwerk (~> 2.2)
     addressable (2.4.0)
     ancestry (3.0.7)
       activerecord (>= 3.2.0)
     appraisal (2.2.0)
       bundler
       rake
       thor (>= 0.14.0)
-    arel (9.0.0)
-    builder (3.2.3)
-    concurrent-ruby (1.1.5)
+    builder (3.2.4)
+    concurrent-ruby (1.1.6)
     coveralls (0.8.23)
       json (>= 1.8, < 3)
       simplecov (~> 0.16.1)
       term-ansicolor (~> 1.3)
       thor (>= 0.19.4, < 2.0)
       tins (~> 1.6)
-    crass (1.0.6)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     diff-lcs (1.3)
-    docile (1.3.1)
-    erubi (1.8.0)
+    docile (1.3.2)
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
-    git (1.5.0)
+    git (1.6.0)
+      rchardet (~> 1.8)
     github_api (0.16.0)
       addressable (~> 2.4.0)
       descendants_tracker (~> 0.0.4)
       faraday (~> 0.8, < 0.10)
       hashie (>= 3.4)
       mime-types (>= 1.16, < 3.0)
       oauth2 (~> 1.0)
-    hashie (3.6.0)
-    highline (2.0.2)
-    i18n (1.6.0)
+    hashie (4.1.0)
+    highline (2.0.3)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     jeweler (2.3.9)
       builder
@@ -72,84 +57,68 @@ GEM
       rake
       rdoc
       semver2
-    json (2.2.0)
+    json (2.3.0)
     jwt (2.2.1)
-    loofah (2.5.0)
-      crass (~> 1.0.2)
-      nokogiri (>= 1.5.9)
-    method_source (0.9.2)
     mime-types (2.99.3)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
-    multi_json (1.13.1)
+    minitest (5.14.0)
+    multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
-    oauth2 (1.4.1)
-      faraday (>= 0.8, < 0.16.0)
+    oauth2 (1.4.4)
+      faraday (>= 0.8, < 2.0)
       jwt (>= 1.0, < 3.0)
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     psych (3.1.0)
-    rack (2.0.7)
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
-    rails-dom-testing (2.0.3)
-      activesupport (>= 4.2.0)
-      nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.4)
-      loofah (~> 2.2, >= 2.2.2)
-    railties (5.2.3)
-      actionpack (= 5.2.3)
-      activesupport (= 5.2.3)
-      method_source
-      rake (>= 0.8.7)
-      thor (>= 0.19.0, < 2.0)
+    rack (2.2.2)
     rake (13.0.1)
-    rdoc (6.1.1)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.3)
+    rchardet (1.8.0)
+    rdoc (6.2.1)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.2)
     semver2 (3.4.2)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    sqlite3 (1.4.1)
+    sqlite3 (1.4.2)
+    sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)
-    thor (0.20.3)
+    thor (1.0.1)
     thread_safe (0.3.6)
-    tins (1.20.3)
-    tzinfo (1.2.5)
+    tins (1.24.1)
+      sync
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
+    zeitwerk (2.3.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (>= 3.0.0)
-  activesupport (>= 3.0.0)
-  ancestry (>= 1.3.0)
+  ancestry
   appraisal
   coveralls
   jeweler
-  railties (>= 3.0.0)
   rspec
   sqlite3
 
 BUNDLED WITH
-   2.0.1
+   2.0.2

gemfiles/rails_3.2.gemfile

@@ -2,9 +2,9 @@
 
 source "http://rubygems.org"
 
+gem "ancestry"
 gem "activerecord", "~> 3.2.22"
 gem "activesupport", "~> 3.2.22"
-gem "ancestry", ">= 1.3.0"
 gem "railties", "~> 3.2.22"
 
 group :development do