Add test for puppetlabs#850

Author: sean797

spec/functions/min_spec.rb

@@ -7,6 +7,7 @@
   it { is_expected.to run.with_params(1, 2).and_return(1) }
   it { is_expected.to run.with_params(1, 2, 3).and_return(1) }
   it { is_expected.to run.with_params(3, 2, 1).and_return(1) }
+  it { is_expected.to run.with_params(12, 8).and_return(8) }
   it { is_expected.to run.with_params('one').and_return('one') }
   it { is_expected.to run.with_params('one', 'two').and_return('one') }
   it { is_expected.to run.with_params('one', 'two', 'three').and_return('one') }