# File test/unit/assertions.rb, line 65

                        def assert_raises(expected_exception_klass, message="")

                                _wrap_assertion {

                                        assert_instance_of(Class, expected_exception_klass, "Should expect a class of exception")

                                        actual_exception = nil

                                        full_message = build_message(message, expected_exception_klass) {

                                                | arg |

                                                "<#{arg}> exception expected but none was thrown"

                                        }

                                        assert_block(full_message) {

                                                thrown = false

                                                begin

                                                        yield

                                                rescue Exception => thrown_exception

                                                        actual_exception = thrown_exception

                                                        thrown = true

                                                end

                                                thrown

                                        }

                                        full_message = build_message(message, expected_exception_klass, actual_exception) {

                                                | arg1, arg2 |

                                                "<#{arg1}> exception expected but was\n" +

                                                arg2

                                        }

                                        assert_block(full_message) {

                                                expected_exception_klass == actual_exception.class

                                        }

                                        actual_exception

                                }

                        end