From f4448bce8fa119dc35bf7386a7683924cada511a Mon Sep 17 00:00:00 2001
From: Timothy Nunn <timothy.nunn@ukaea.uk>
Date: Wed, 4 Mar 2026 11:19:40 +0000
Subject: [PATCH] Hide model logs in regression test output

---
 tests/regression/test_process_input_files.py | 22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tests/regression/test_process_input_files.py b/tests/regression/test_process_input_files.py
index 416375984..132ed2a0c 100644
--- a/tests/regression/test_process_input_files.py
+++ b/tests/regression/test_process_input_files.py
@@ -36,6 +36,27 @@
 }
 
 
+class ProcessModelFilter(logging.Filter):
+    def filter(self, record):
+        return 0 if record.levelno < logging.CRITICAL else 1
+
+
+@pytest.fixture
+def hide_model_logs():
+    """Hides model logs (process.model.*) from being reported if a regression test fails.
+
+    This fixture adds a filter to all of the handlers on the root logger before the tests are run.
+    Modifying the logger handlers is crucial to avoid interfering with PROCESS model log system
+    which adds its own handers when PROCESS is run (hence why this is not done using the caplog fixture).
+    """
+    filter_ = ProcessModelFilter(name="process.models")
+    for handler in logging.getLogger().handlers:
+        handler.addFilter(filter_)
+    yield
+    for handler in logging.getLogger().handlers:
+        handler.removeFilter(filter_)
+
+
 @dataclass
 class MFileVariableDifference:
     name: str
@@ -245,6 +266,7 @@ def test_input_file(
     tracked_regression_test_assets,
     reg_tolerance: float,
     opt_params_only: bool,
+    hide_model_logs,
 ):
     """Tests each input file in the 'input_files' directory.