Change ruby test version from 2.4 to 2.5 (#180)

* Change Docker files for feature tests, 
* Change documentation
* Change gemspec ruby version reference

Author: AlexB52

README.md

@@ -119,7 +119,7 @@ $ retest 'bundle exec rails test <test>'
 
 ## Ruby Support
 
-Retest supports ruby 2.4 and above.
+Retest supports ruby 2.5 and above.
 
 ## Roadmap
 

features/git-ruby/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git"
 

features/git-ruby/retest/retest_test.rb

@@ -26,9 +26,11 @@ def test_start_retest
 
 class GitChangesTest < Minitest::Test
   def setup
+    `git config --global init.defaultBranch main`
+    `git config --global --add safe.directory /usr/src/app`
+    `git config --global user.email "you@example.com"`
+    `git config --global user.name "Your Name"`
     `git init`
-    `git config --local user.email "you@example.com"`
-    `git config --local user.name "Your Name"`
     `git add .`
     `git commit -m "First commit"`
     `git checkout -b feature-branch`
@@ -53,7 +55,7 @@ def test_diffs_from_other_branch
     `git add .`
     `git commit -m "Rename, Add and Remove files"`
 
-    @output, @pid = launch_retest 'retest --diff=master --ruby'
+    @output, @pid = launch_retest 'retest --diff=main --ruby'
     sleep 2
 
     assert_match <<~EXPECTED, @output.read

features/hanami-app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git sqlite-dev"
 

features/rails-app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git nodejs tzdata sqlite-dev"
 

features/rails-app/retest/retest_test.rb

@@ -94,17 +94,19 @@ def test_repository_setup
 
 class DiffOptionTest < Minitest::Test
   def setup
+    `git config --global init.defaultBranch main`
+    `git config --global user.email "you@example.com"`
+    `git config --global user.name "Your Name"`
+    `git config --global --add safe.directory /usr/src/app`
     `git init`
-    `git config --local user.email "you@example.com"`
-    `git config --local user.name "Your Name"`
     `git add .`
     `git commit -m "First commit"`
     `git checkout -b feature-branch`
   end
 
   def teardown
     @output.delete
-    `git checkout master`
+    `git checkout -`
     `git clean -fd .`
     `git checkout .`
     `git branch -D feature-branch`
@@ -118,7 +120,7 @@ def test_diffs_from_other_branch
     `git add .`
     `git commit -m "Scaffold books"`
 
-    @output, @pid = launch_retest 'retest --diff=master'
+    @output, @pid = launch_retest 'retest --diff=main'
     sleep 10
 
     assert_match <<~EXPECTED, @output.read

features/rspec-rails/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git nodejs tzdata sqlite-dev"
 

features/rspec-ruby/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git"
 

features/ruby-app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git"
 

features/ruby-bare/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.10-alpine
+FROM ruby:2.5.9-alpine3.13
 
 ARG BUILD_PACKAGES="build-base git"
 

retest.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.summary       = "A simple command line tool to watch file change and run its matching spec."
   spec.homepage      = "https://github.com/AlexB52/retest"
   spec.license       = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
 
   # spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"