Add a tests

Also fix mypy settings for tests and noxfile

Author: basepi

mypy.ini

@@ -0,0 +1,8 @@
+[mypy]
+exclude = "/tests/"
+
+[mypy-tests.*]
+ignore_errors = true
+
+[mypy-noxfile]
+ignore_errors = true

pyproject.toml

@@ -43,3 +43,9 @@ develop = [
 "Documentation" = "https://github.com/elastic/ecs-logging-python"
 "Issue Tracker" = "https://github.com/elastic/ecs-logging-python/issues"
 "Changelog" = "https://github.com/elastic/ecs-logging-python/blob/master/CHANGELOG.md"
+
+[mypy]
+exclude = "/tests/"
+
+["mypy-tests.*"]
+ignore_errors = true

tests/test_stdlib_formatter.py

@@ -16,6 +16,7 @@
 # under the License.
 
 import logging
+import logging.config
 import mock
 import pytest
 import json
@@ -327,3 +328,12 @@ def test_stack_info_excluded(logger, exclude_fields):
 
     ecs = json.loads(stream.getvalue().rstrip())
     assert "error" not in ecs
+
+
+def test_stdlibformatter_signature():
+    logging.config.dictConfig(
+        {
+            "version": 1,
+            "formatters": {"my_formatter": {"class": "ecs_logging.StdlibFormatter"}},
+        }
+    )