[开发测试]单元测试Mock log4j校验日志内容

mock log4j

private StringBuilder mockLog() {
        final StringBuilder stringBuilder = new StringBuilder();
        new MockUp<Log4jLogger>() {
            // 重写要mock的方法
            @mockit.Mock
            public void info(final String format, final Object o) {
                ParameterizedMessage parameterizedMessage = new ParameterizedMessage(format, o);
                stringBuilder.append(parameterizedMessage.getFormattedMessage());
            }

            @mockit.Mock
            public void error(final String format) {
                stringBuilder.append(format);
            }

            @mockit.Mock
            public void error(final String format, final Object o) {
                ParameterizedMessage parameterizedMessage = new ParameterizedMessage(format, o);
                stringBuilder.append(parameterizedMessage.getFormattedMessage());
            }

            public void error(final String format, final Throwable t) {
                ParameterizedMessage parameterizedMessage = new ParameterizedMessage(format, t);
                stringBuilder.append(parameterizedMessage.getFormattedMessage());
            }
        };
        return stringBuilder;
    }

校验日志内容

        final StringBuilder stringBuilder = mockLog();
        xxx.run();
        Assertions.assertEquals("xxxxx", stringBuilder.toString());