Merge bundler to standard libraries.

rubygems 2.7.x depends bundler-1.15.x. This is preparation for
  rubygems and bundler migration.

  * lib/bundler.rb, lib/bundler/*: files of bundler-1.15.4
  * spec/bundler/*: rspec examples of bundler-1.15.4. I applied patches.
    * https://github.com/bundler/bundler/pull/6007
    * Exclude not working examples on ruby repository.
    * Fake ruby interpriter instead of installed ruby.
  * Makefile.in: Added test task named `test-bundler`. This task is only
    working macOS/linux yet. I'm going to support Windows environment later.
  * tool/sync_default_gems.rb: Added sync task for bundler.

  [Feature #12733][ruby-core:77172]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/bundler/commands/info_spec.rb

@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+require "spec_helper"
+
+RSpec.describe "bundle info" do
+  context "info from specific gem in gemfile" do
+    before do
+      install_gemfile <<-G
+        source "file://#{gem_repo1}"
+        gem "rails"
+      G
+    end
+
+    it "prints information about the current gem" do
+      bundle "info rails"
+      expect(out).to include "* rails (2.3.2)
+\tSummary: This is just a fake gem for testing
+\tHomepage: http://example.com"
+      expect(out).to match(%r{Path\: .*\/rails\-2\.3\.2})
+    end
+
+    context "given a gem that is not installed" do
+      it "prints missing gem error" do
+        bundle "info foo"
+        expect(out).to eq "Could not find gem 'foo'."
+      end
+    end
+
+    context "given a default gem shippped in ruby", :ruby_repo do
+      it "prints information about the default gem", :if => (RUBY_VERSION >= "2.0") do
+        bundle "info rdoc"
+        expect(out).to include("* rdoc")
+        expect(out).to include("Default Gem: yes")
+      end
+    end
+
+    context "when gem does not have homepage" do
+      before do
+        build_repo1 do
+          build_gem "rails", "2.3.2" do |s|
+            s.executables = "rails"
+            s.summary = "Just another test gem"
+          end
+        end
+      end
+
+      it "excludes the homepage field from the output" do
+        expect(out).to_not include("Homepage:")
+      end
+    end
+
+    context "given --path option" do
+      it "prints the path to the gem" do
+        bundle "info rails"
+        expect(out).to match(%r{.*\/rails\-2\.3\.2})
+      end
+    end
+  end
+end