ensure that setting loglevel on one logger doesn't change others

tests/backend/util/test_logging.py

@@ -0,0 +1,57 @@
+"""
+Test interaction of logging with configuration system.
+"""
+import io
+import logging
+import re
+
+from invokeai.app.services.config import InvokeAIAppConfig
+from invokeai.backend.util.logging import InvokeAILogger, LOG_FORMATTERS
+
+
+# test formatting
+# Would prefer to use the capfd/capsys fixture here, but it is broken
+# when used with the logging module: https://github.com/pytest-dev/pytest/issue
+def test_formatting():
+    logger = InvokeAILogger.get_logger()
+    stream = io.StringIO()
+    handler = logging.StreamHandler(stream)
+    handler.setFormatter(LOG_FORMATTERS["plain"]())
+    logger.addHandler(handler)
+    logger.info("test1")
+    output = stream.getvalue()
+    assert re.search(r"\[InvokeAI\]::INFO --> test1$", output)
+
+    handler.setFormatter(LOG_FORMATTERS["legacy"]())
+    logger.info("test2")
+    output = stream.getvalue()
+    assert re.search(r">> test2$", output)
+
+
+# test independence of two loggers with different names
+def test_independence():
+    logger1 = InvokeAILogger.get_logger()
+    logger2 = InvokeAILogger.get_logger("Test")
+    assert logger1.name == "InvokeAI"
+    assert logger2.name == "Test"
+    assert logger1.level == logging.INFO
+    assert logger2.level == logging.INFO
+    logger2.setLevel(logging.DEBUG)
+    assert logger1.level == logging.INFO
+    assert logger2.level == logging.DEBUG
+
+
+# test that the logger is returned from two similar get_logger() calls
+def test_retrieval():
+    logger1 = InvokeAILogger.get_logger()
+    logger2 = InvokeAILogger.get_logger()
+    logger3 = InvokeAILogger.get_logger("Test")
+    assert logger1 == logger2
+    assert logger1 != logger3
+
+
+# test that the configuration is used to set the initial logging level
+def test_config():
+    config = InvokeAIAppConfig(log_level="debug")
+    logger1 = InvokeAILogger.get_logger("DebugTest", config=config)
+    assert logger1.level == logging.DEBUG