add newsfrag; some tweaks

doc/newsfragments/3147_changed.another_json_lib.rst

@@ -0,0 +1 @@
+Use a new JSON library ``orjson`` to improve performance when using Python 3.8 or later versions.

tests/functional/testplan/exporters/testing/test_json.py

@@ -217,8 +217,11 @@ def test_json_exporter_generating_split_report(runpath):
     assert assertions["After Start"][0]["type"] == "Log"
 
     # special values representation preserved
-    assert str(assertions["test_special_values"][0]["first"]) == "NaN"
-    assert str(assertions["test_special_values"][1]["first"]) == "-Infinity"
+    # NOTE: these values are of type float in old impl,
+    # NOTE: converted to js repr in cope with json lib change
+    assert assertions["test_special_values"][0]["first"] == "NaN"
+    assert assertions["test_special_values"][1]["first"] == "-Infinity"
+    assert assertions["test_special_values"][1]["second"] == "Infinity"
 
 
 def test_implicit_exporter_initialization(runpath):

tests/unit/testplan/report/test_testing.py

@@ -1,16 +1,12 @@
-# TODO: move certain tests to tests/unit/testplan/common/report/test_base.py
-
 import functools
 import json
 from collections import OrderedDict
-from unittest import mock
 
 import pytest
 from boltons.iterutils import get_path
 
 from testplan.common import entity
 from testplan.common.report import (
-    BaseReportGroup,
     ReportCategories,
     RuntimeStatus,
     Status,