Wrote tests for the :check_ruby_version initializer

railties/test/initializer/check_ruby_version_test.rb

@@ -0,0 +1,59 @@
+require 'abstract_unit'
+require 'active_support/ruby/shim'
+require 'initializer'
+
+RAILS_ROOT.replace File.join(File.dirname(__FILE__), "root")
+
+module Rails
+  def self.vendor_rails? ; false ; end
+end
+
+module InitializerTests
+  class PathsTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    test "rails does not initialize with ruby version 1.8.1" do
+      assert_rails_does_not_boot "1.8.1"
+    end
+
+    test "rails initializes with ruby version 1.8.2" do
+      assert_rails_boots "1.8.2"
+    end
+
+    test "rails does not initialize with ruby version 1.8.3" do
+      assert_rails_does_not_boot "1.8.3"
+    end
+
+    test "rails initializes with ruby version 1.8.4" do
+      assert_rails_boots "1.8.4"
+    end
+
+    test "rails initializes with ruby version 1.8.5" do
+      assert_rails_boots "1.8.5"
+    end
+
+    test "rails initializes with ruby version 1.8.6" do
+      assert_rails_boots "1.8.6"
+    end
+
+    def set_ruby_version(version)
+      $-w = nil
+      Object.const_set(:RUBY_VERSION, version.freeze)
+    end
+
+    def assert_rails_boots(version)
+      set_ruby_version(version)
+      assert_nothing_raised "It appears that rails does not boot" do
+        Rails::Initializer.run { |c| c.frameworks = [] }
+      end
+    end
+
+    def assert_rails_does_not_boot(version)
+      set_ruby_version(version)
+      $stderr = File.open("/dev/null", "w")
+      assert_raises(SystemExit) do
+        Rails::Initializer.run { |c| c.frameworks = [] }
+      end
+    end
+  end
+end