Apparatus and method for non-determinative testing using unscripted communications between a network simulator and an equipment under test

1. A test apparatus configurable to perform non-determinative testing of equipment, the apparatus comprising:

a test computer arranged to automatically execute a non-determinative test regime under control of a test application; and

a network simulator connected to the test computer and provided with communication circuitry operable to communicate with the equipment under test, the network simulator being configurable into a plurality of different network states with an unscripted interactive period interposed between each of the plurality of different network states, and according to the non-determinative test regime, wherein the test application is operable to control the network simulator to transition between the plurality of different network states and to monitor data of communications between the network simulator and the equipment during each unscripted interactive period between said transitions.

2. The test apparatus of claim 1 , wherein the network simulator comprises a protocol stack module configurable by the test application.

3. The test apparatus of claim 1 , wherein the network simulator comprises a protocol stack module configurable via the test application between network states adopting different radio access technologies.

4. The test apparatus of claim 1 , wherein the test application comprises a test regime comprising a plurality of preprogrammed transitions between different network states.

5. The test apparatus of claim 1 , wherein the test application is operable to cause the network simulator to adopt new network settings as part of a transition to a new network state.

6. The test apparatus of claim 1 , wherein the test application is operable to cause the network simulator in a new network state to send a test message to the equipment.

7. The test apparatus of claim 1 , wherein the network simulator is operable to transition between different network states based upon one or more of a specific time or a time delay.

8. The test apparatus of claim 1 , wherein the network simulator is operable to transition between different network states based upon one or more of a specific time or a time delay.

9. The test apparatus of claim 1 , wherein the network simulator is operable to transition between different network states responsive to a trigger event, and wherein the trigger event is a condition met within one or more of the equipment and the network simulator.

10. The test apparatus of claim 1 , wherein the network simulator is operable to transition between different network states responsive to a trigger event.

11. The test apparatus of claim 10 , wherein the trigger event is predetermined message received by the network simulator from the equipment.

12. The test apparatus of claim 1 , further comprising a logger operable to record data relating to the plurality of network states and for relevant network states associated data relating to the communications between the network simulator and the equipment.

13. The test apparatus of claim 12 , further comprising a software tool operable to automatically analyse data recorded by the logger in order to determine a test outcome.

14. A test application for network simulator-based testing of equipment, the test application comprising a non-transitory computer-readable medium comprising instructions that when executed by a computer cause the computer to:

establish a first network simulator state using a first set of network parameters to be used according to a non-determinative test regime;

monitor unscripted interactive periods of communication between the network simulator and the equipment while the network simulator is in said first state;

cause the network simulator to transition to another network simulator state based upon a second set of network parameters according to the test regime, monitor an unscripted interactive period of communication between the network simulator and the equipment while the network simulator is in said second state, wherein the unscripted interactive period is interposed the first and second states; and

cause log data relating to each network simulator state and associated communications between the network simulator and the equipment to be recorded in a log file.

15. A network simulator configured for testing of equipment, the network

simulator comprising:

a protocol stack module;

transmission circuitry for communications with the equipment; and

a controller having an interface to a test application, the controller being operable to receive parameters from the test application, including protocol stack parameters, and to cause the network simulator to successively transition between a plurality of different programmed network simulator states based on said parameters, with an unscripted interactive period interposed between each of the plurality of different programmed network states, wherein the controller is operable to monitor each unscripted interactive period of wireless communication between the equipment under test and the network simulator during each network state.

16. The network simulator of claim 15 , wherein the transmission circuitry for communications with the equipment includes at least one antenna.