@Bean
		public PropertyPlaceholderConfigurer ppc() {
			PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
			Properties props = new Properties();
			props.put("timeField", "payload.ts");
			props.put("dateFormat", "dd/MM/yyyy");
			props.put("computedNameExpression", "'foo'");
			props.put("incrementExpression", "1");
			propertyPlaceholderConfigurer.setProperties(props);
			return propertyPlaceholderConfigurer;
		}
Tests the aggregate-counter module.

@author Eric Bottard
spring-xd-analytics/src/test/java/org/springframework/xd/analytics/metrics/integration/AggregateCounterTests.java