`run_tests` now takes a (subclass of) `RPCTestHandler` as its first
argument, and returns `True` if all tests passed instead of calling
`sys.exit`. This enables RPC tests to be run from Python and the
execution of individual tests to be customised:
```python
import importlib
import sys
sys.path.append('qa/pull-tester')
rpc_tests = importlib.import_module('rpc-tests')
src_dir = '.'
build_dir = '.'
exeext = ''
class MyTestHandler(rpc_tests.RPCTestHandler):
def start_test(self, args, stdout, stderr):
print('Starting test!')
return subprocess.Popen(
args,
universal_newlines=True,
stdout=stdout,
stderr=stderr)
test_list = ['test_to_run.py']
all_passed = rpc_tests.run_tests(MyTestHandler, test_list, src_dir, build_dir, exeext)
```