elogtool: add pytest for elogtool

This CL adds a python test for elogtool.
It tests the basic functionality of elogtool: list, clear and add.
A future CL will include more complex tests.

BUG=b:172210863
TEST=pytest elogtool_test.py

Change-Id: If1241ad070d1c690c84f5ca61c0487ba27c2a287
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57869
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/tests/conftest.py

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+import pathlib
+
+
+def pytest_addoption(parser):
+    here = pathlib.Path(__file__).parent
+    parser.addoption(
+        "--elogtool-path",
+        type=pathlib.Path,
+        default=(here / ".." / "elogtool").resolve(),
+    )