add unit test for reset method

Signed-off-by: Samuel Dacanay <[email protected]>

Author: dakaneye

tests/unit/anchore_engine/services/policy_engine/engine/policy/test_gate.py

@@ -1,6 +1,9 @@
 import pytest
 
-from anchore_engine.services.policy_engine.engine.policy.gates import PackageCheckGate
+from anchore_engine.services.policy_engine.engine.policy.gates import (
+    PackageCheckGate,
+    BaseTrigger,
+)
 from anchore_engine.services.policy_engine.engine.policy.gates.dockerfile import (
     EffectiveUserTrigger,
 )
@@ -59,3 +62,9 @@ def test_parameters(self, param):
         parameters = param["trigger"](param["gate"]).parameters()
         for key, value in param["expected_params"].items():
             assert parameters.get(key).__class__ == value
+
+    def test_reset(self):
+        trigger = BaseTrigger(PackageCheckGate)
+        trigger._fired_instances = [1, 2, 3]
+        trigger.reset()
+        assert trigger._fired_instances == []