A driver application has been prepared in js for running batched tests.
There is a convenient public API defined for reading the current test
status & subscribing to changes thereof.
The solution is modular - the module qwasmjsruntime can be used for any
wasm instantiation, e.g. in the next iteration of qtloader.
Change-Id: I00df88188c46a42f86d431285ca96d60d89b3f05
Pick-to: 6.4
Reviewed-by: David Skoland <david.skoland@qt.io>
