Added bundler as default gems. Revisit [Feature #12733]

* bin/*, lib/bundler/*, lib/bundler.rb, spec/bundler, man/*:
    Merge from latest stable branch of bundler/bundler repository and
    added workaround patches. I will backport them into upstream.
  * common.mk, defs/gmake.mk: Added `test-bundler` task for test suite
    of bundler.
  * tool/sync_default_gems.rb: Added sync task for bundler.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/bundler/runtime/load_spec.rb

@@ -0,0 +1,111 @@
+# frozen_string_literal: true
+
+RSpec.describe "Bundler.load" do
+  describe "with a gemfile" do
+    before(:each) do
+      install_gemfile! <<-G
+        source "file://#{gem_repo1}"
+        gem "rack"
+      G
+    end
+
+    it "provides a list of the env dependencies" do
+      expect(Bundler.load.dependencies).to have_dep("rack", ">= 0")
+    end
+
+    it "provides a list of the resolved gems" do
+      expect(Bundler.load.gems).to have_gem("rack-1.0.0", "bundler-#{Bundler::VERSION}")
+    end
+
+    it "ignores blank BUNDLE_GEMFILEs" do
+      expect do
+        ENV["BUNDLE_GEMFILE"] = ""
+        Bundler.load
+      end.not_to raise_error
+    end
+  end
+
+  describe "with a gems.rb file" do
+    before(:each) do
+      create_file "gems.rb", <<-G
+        source "file://#{gem_repo1}"
+        gem "rack"
+      G
+      bundle! :install
+    end
+
+    it "provides a list of the env dependencies" do
+      expect(Bundler.load.dependencies).to have_dep("rack", ">= 0")
+    end
+
+    it "provides a list of the resolved gems" do
+      expect(Bundler.load.gems).to have_gem("rack-1.0.0", "bundler-#{Bundler::VERSION}")
+    end
+  end
+
+  describe "without a gemfile" do
+    it "raises an exception if the default gemfile is not found" do
+      expect do
+        Bundler.load
+      end.to raise_error(Bundler::GemfileNotFound, /could not locate gemfile/i)
+    end
+
+    it "raises an exception if a specified gemfile is not found" do
+      expect do
+        ENV["BUNDLE_GEMFILE"] = "omg.rb"
+        Bundler.load
+      end.to raise_error(Bundler::GemfileNotFound, /omg\.rb/)
+    end
+
+    it "does not find a Gemfile above the testing directory" do
+      bundler_gemfile = tmp.join("../Gemfile")
+      unless File.exist?(bundler_gemfile)
+        FileUtils.touch(bundler_gemfile)
+        @remove_bundler_gemfile = true
+      end
+      begin
+        expect { Bundler.load }.to raise_error(Bundler::GemfileNotFound)
+      ensure
+        bundler_gemfile.rmtree if @remove_bundler_gemfile
+      end
+    end
+  end
+
+  describe "when called twice" do
+    it "doesn't try to load the runtime twice" do
+      install_gemfile! <<-G
+        source "file:#{gem_repo1}"
+        gem "rack"
+        gem "activesupport", :group => :test
+      G
+
+      ruby! <<-RUBY
+        require "bundler"
+        Bundler.setup :default
+        Bundler.require :default
+        puts RACK
+        begin
+          require "activesupport"
+        rescue LoadError
+          puts "no activesupport"
+        end
+      RUBY
+
+      expect(out.split("\n")).to eq(["1.0.0", "no activesupport"])
+    end
+  end
+
+  describe "not hurting brittle rubygems" do
+    it "does not inject #source into the generated YAML of the gem specs" do
+      install_gemfile! <<-G
+        source "file:#{gem_repo1}"
+        gem "activerecord"
+      G
+
+      Bundler.load.specs.each do |spec|
+        expect(spec.to_yaml).not_to match(/^\s+source:/)
+        expect(spec.to_yaml).not_to match(/^\s+groups:/)
+      end
+    end
+  end
+end