Rspec varargs argument matching

blah_spec.rb

    # Actual test
    it "prefixes each of it's locks with :prefix:" do
      expect(ZookeeperLocker).to receive(:lock_no_retry)
        .with(start_with("hello"))

      lock_for_time_range "hello", @window do
        # nothing
      end
    end     
     
     # Failure message
     Failure/Error: lock_for_time_range "hello", @window do
       <ZookeeperLocker (class)> received :lock_no_retry with unexpected arguments
         expected: (start with "hello")
              got: ("hello_20160711182245", "hello_20160712182245", "hello_20160713182245")