This video explains how to make a pipe leak test as per the European Standard EN1610.
It demonstrates the two methods which can be used to test a pipeline. The first one is by using pipe plugs without bypass and filling the water in the test area through the manhole. The second one is by filling the water through the pipe test plug with bypass.
These practices are suitable apply for leak test of the concrete pipes, GRP pipes or HDPE pipes. All Gravity Pipelines can be tested by these ways.