Allow passing through of the full-index option.

Bundler provides an option to fetch the full RubyGems index. This is
useful in the case of really old dependencies (like Rails 3 in 2018)
which still work, but are not returned normally. This allows passing
that through to `bundle install`.

Author: nickcharlton

lib/appraisal/cli.rb

@@ -46,6 +46,9 @@ def self.exit_on_failure?
     method_option "without", :banner => "GROUP_NAMES",
       :desc => "A space-separated list of groups referencing gems to skip " +
         "during installation. Bundler will remember this option."
+    method_option "full-index", type: :boolean,
+                                desc: "Run bundle install with the " \
+                                      "full-index argument."
     def install
       invoke :generate, [], {}
 

spec/acceptance/cli/install_spec.rb

@@ -52,8 +52,9 @@
     it 'accepts --jobs option to set job size' do
       output = run 'appraisal install --jobs=2'
 
-      expect(output).to include
+      expect(output).to include(
         'bundle install --gemfile=gemfiles/1.0.0.gemfile --jobs=2'
+      )
     end
 
     it 'ignores --jobs option if the job size is less than or equal to 1' do
@@ -67,4 +68,23 @@
         'bundle install --gemfile=gemfiles/1.0.0.gemfile --jobs=1')
     end
   end
+
+  context "with full-index", :parallel do
+    before do
+      build_appraisal_file <<-APPRAISAL
+        appraise '1.0.0' do
+          gem 'dummy', '1.0.0'
+        end
+      APPRAISAL
+    end
+
+    it "accepts --full-index option to pull the full RubyGems index" do
+      output = run("appraisal install --full-index")
+
+      expect(output).to include(
+        "bundle install --gemfile='gemfiles/1.0.0.gemfile' " \
+        "--retry 1 --full-index true",
+      )
+    end
+  end
 end