Add test for Scenario.__radd__ and validate JSON deserialization

Author: Евгений Блинов

tests/units/test_benchmark_result.py

@@ -404,3 +404,8 @@ def test_from_json_missing_is_primary_raises(self) -> None:
         payload = json.dumps({'durations': [0.1, 0.2]})
         with pytest.raises(ValueError, match='required fields'):
             BenchmarkResult.from_json(payload)
+
+    def test_from_json_not_dict_raises(self) -> None:
+        payload = json.dumps([1, 2, 3])
+        with pytest.raises(ValueError, match='JSON must be an object'):
+            BenchmarkResult.from_json(payload)

tests/units/test_scenario.py

@@ -271,6 +271,16 @@ def test_add_unknown_type_returns_not_implemented(self) -> None:
         result = s.__add__(42)  # type: ignore[arg-type]
         assert result is NotImplemented
 
+    def test_radd_scenario_scenario(self) -> None:
+        s1 = Scenario(lambda: None, name='s1')
+        s2 = Scenario(lambda: None, name='s2')
+        # s2.__radd__(s1) = ScenarioGroup(s1, s2)
+        group = s2.__radd__(s1)
+        assert isinstance(group, ScenarioGroup)
+        results = group.run()
+        assert results[0].scenario is s1
+        assert results[1].scenario is s2
+
     def test_radd_group_scenario(self) -> None:
         s1 = Scenario(lambda: None, name='s1')
         s2 = Scenario(lambda: None, name='s2')