Adding users dynamically is valuable in Multi-Test runs which assess the target server's limits. While running a load test, you might notice that the target servers are handling the load quite well. As an alternative to shutting down and starting a new test with a different configuration, you can simply add additional tests to your active Multi Test on the fly, adding more users/load. Once a test is added to the Multi Test, its results will be aggregated with the rest of the Multi Test's results, forming a big picture analysis.

You can add any test while the Multi-Test is running by simply starting the single test, then selecting the option to add it to the Multi Test.

Note: Only tests within the same project can be included in a Multi-Test. 

• How to Add Tests Dynamically
• How to Add Tests via the API

How to Add Tests Dynamically

Step 1

Create a Multi-Test and run it.

Step 2

If you believe you could use some more load, or simply want to add another scenario to the Multi-Test, select and run your single test as usual by clicking on the 'Play' button.

Step 3

In the pop-up window, you will see an option to 'Run this test as part of a master session,' in which you can choose to run it as a single standalone test, or as part of any Multi-Test that is currently active.

If you choose to run the test under the Multi-Test, then right after the new test finishes its startup stage, its results will be aggregated together with the overall results of the Multi-Test.
In the report shown below, notice the moment in which a new test was added to the load.

How to Add Tests via the API

Alternatively, you can add a single test to a currently running multi-test via the API.  To do so, perform a POST to the following endpoint:

https://a.blazemeter.com/api/v4/tests/{{testId}}/start?delayedStart=true&masterId={{masterId}}

The above API includes the following options:

• {{testID}} = The test ID of the single test you wish to add.
• {{masterID}} = The master ID of the multi-test you wish to add the single test to.