fixup! Allow passing through of the full-index option.

Author: nickcharlton

spec/acceptance/cli/install_spec.rb

@@ -85,8 +85,8 @@
       output = run("appraisal install --full-index")
 
       expect(output).to include(
-        "bundle install --gemfile='gemfiles/1.0.0.gemfile' " \
-        "--retry 1 --full-index true",
+        "bundle install --gemfile='#{file('gemfiles/1.0.0.gemfile')}' " \
+        "--retry 1 --full-index true"
       )
     end
   end