tests: enable verbose stderr logging

note: print() statements and stderr logging don't have a consistent printing order.
Either can buffer log lines and flush them later, and the buffers are independent.

tests/__init__.py

@@ -19,7 +19,7 @@ from electrum.logging import Logger
 FAST_TESTS = False
 
 
-electrum.logging._configure_stderr_logging()
+electrum.logging._configure_stderr_logging(verbosity="*")
 
 electrum.util.AS_LIB_USER_I_WANT_TO_MANAGE_MY_OWN_ASYNCIO_LOOP = True
 

tests/test_network.py

@@ -38,7 +38,7 @@ class MockInterface(Interface):
     async def get_block_header(self, height: int, *, mode: ChainResolutionMode) -> dict:
         assert self.q.qsize() > 0, (height, mode)
         item = await self.q.get()
-        print("step with height", height, item)
+        self.logger.debug(f"step with {height=}. {item=}")
         assert item['block_height'] == height, (item['block_height'], height)
         assert mode in item['mock'], (mode, item)
         return item