test/board_test.rb in hybridgroup-firmata-0.4.1 vs test/board_test.rb in hybridgroup-firmata-0.4.2

@@ -6,10 +6,10 @@
 
 class BoardTest < MiniTest::Unit::TestCase
 
   def mock_serial_port(*args, &block)
     mock_port = MiniTest::Mock.new
-    mock_port.expect(:is_a?, false, [nil])
+    mock_port.expect(:is_a?, false, [String])
 
     if block_given?
       yield mock_port
     else
       expected = args.map(&:chr).join
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