coverage.rb: Fix handling of 0 total resources

lib/rspec-puppet/coverage.rb

@@ -187,7 +187,9 @@ def results
       report[:total] = @collection.size
       report[:touched] = @collection.count { |_, resource| resource.touched? }
       report[:untouched] = report[:total] - report[:touched]
-      report[:coverage] = "%5.2f" % ((report[:touched].to_f / report[:total].to_f) * 100)
+
+      coverage = report[:total].to_f > 0 ? ((report[:touched].to_f / report[:total].to_f) * 100) : 100.0
+      report[:coverage] = "%5.2f" % coverage
 
       report[:resources] = Hash[*@collection.map do |name, wrapper|
         [name, wrapper.to_hash]

spec/unit/coverage_spec.rb

@@ -103,5 +103,14 @@
         expect(resources["Notify[#{name}]"]).to eq(:touched => false)
       end
     end
+
+    context "when there are no resources" do
+      let(:touched) { [] }
+      let(:untouched) { [] }
+
+      it "reports 100% coverage" do
+        expect(report[:coverage]).to eq "100.00"
+      end
+    end
   end
 end