The NAPLAN system can be tested by creating the following set of custom tests (for help creating tests see: How do I add a test?):
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Create a sensor test with the following parameters:

Service category: External
Template Type: Custom
Test Template: Webserver
Title: NAPLAN Website
Target: www.nap.edu.au
Tests: HTTP on port 80, ICMP ping, HTTP status codes

Create a sensor test with the following parameters:

Service category: External
Template Type: Custom
Test Template: Webserver
Title: NAPLAN latency
Target: pages.assessform.edu.au
Tests: HTTP on port 80, HTTPS on port 443, ICMP ping

Create three sensor tests with using the template below to test bandwidth to the host 13.237.44.230 on ports 5001, 5002, and 5003:

Service category: External
Template Type: Custom
Test Template: iPerf3
Title: NAPLAN load-{1,2,3}
Direction: Download
Protocol: TCP
Port: 5001, 5002, 5003 (create a new test for each port)
Maximum bandwidth: 4Mbit/sec
Window size: 0
Test duration: 10 seconds
Parallel streams: 10
Frequency: 30 minutes

After the tests have been created you can assign them to your sensors. The NAPLAN load tests should be distributed across sensors, so 1/3 gets NAPLAN load-1, 1/3 NAPLAN load-2, and the final third gets NAPLAN load-3.