Merge pull request #894 from jackorp/fix_rspec_failure

Fix rspec random test failure.

spec/lib/guard/plugin_util_spec.rb

@@ -34,6 +34,7 @@ RSpec.describe Guard::PluginUtil do
       gem = class_double(Gem::Specification)
       stub_const("Gem::Specification", gem)
       expect(Gem::Specification).to receive(:find_all) { gems }
+      allow(Gem::Specification).to receive(:unresolved_deps) { [] }
     end
     it "returns the list of guard gems" do