# File test/unit/assertions.rb, line 260
   def assert_throws(expected_symbol, message="", &proc)
				_wrap_assertion {
					assert_instance_of(Symbol, expected_symbol, "assertThrows expects the symbol that should be thrown for its first argument")
					assert(block_given?, "Should have passed a block to assertThrows")
					caught = true
					begin
						catch(expected_symbol) {
							proc.call
							caught = false
						}
						full_message = build_message(message, expected_symbol) {
							| arg |
							"<:#{arg}> should have been thrown"
						}
						assert(caught, full_message)
					rescue NameError => name_error
						if ( name_error.message !~ /^uncaught throw `(.+)'$/ )
							raise name_error
						end
						full_message = build_message(message, expected_symbol, $1) {
							| arg1, arg2 |
							"Expected <:#{arg1}> to be thrown but <:#{arg2}> was thrown"
						}
						flunk(full_message)
					end	
				}
			end