Set logging level to DEBUG during test setup

Moved the logging level configuration into the `pytest_runtest_setup` function to ensure consistent logging behavior during test execution. This ensures debug logs are enabled only when tests are run.

Author: LarsKue

tests/conftest.py

@@ -5,8 +5,6 @@
 
 BACKENDS = ["jax", "numpy", "tensorflow", "torch"]
 
-logging.getLogger("bayesflow").setLevel(logging.DEBUG)
-
 
 def pytest_runtest_setup(item):
     """Skips backends by test markers. Unmarked tests are treated as backend-agnostic"""
@@ -28,6 +26,9 @@ def pytest_runtest_setup(item):
     # use a non-GUI plotting backend for tests
     matplotlib.use("Agg")
 
+    # set the logging level to debug for all tests
+    logging.getLogger("bayesflow").setLevel(logging.DEBUG)
+
 
 def pytest_runtest_teardown(item, nextitem):
     import matplotlib.pyplot as plt