Add MCCP2 compressed stream support

test/test_helper.rb

@@ -29,6 +29,16 @@ module MeowTest
       assert(value.empty?, message || "Expected #{value.inspect} to be empty")
     end
 
+    def assert_raises(error_class)
+      yield
+    rescue error_class => error
+      return error
+    rescue StandardError => error
+      raise Failure, "Expected #{error_class}, got #{error.class}: #{error.message}"
+    else
+      raise Failure, "Expected #{error_class} to be raised"
+    end
+
     def run!
       failures = []
       @tests.each do |name, test|