fix: check err

Author: wafuwafu13

events/ecs_container_instance_test.go

@@ -85,7 +85,10 @@ func TestECSContainerInstanceEventMarshaling(t *testing.T) {
 	// `registeredResources` key and `remainingResources` key have `stringSetValue` key.
 	// if `stringSetValue` key is empty array, it should be removed from outputJSON.
 	var result map[string]interface{}
-	json.Unmarshal(outputJSON, &result)
+	err = json.Unmarshal(outputJSON, &result)
+	if err != nil {
+		t.Errorf("could not marshal event. details: %v", err)
+	}
 	for _, resourcesType := range []string{"registeredResources", "remainingResources"} {
 		resources := result["detail"].(map[string]interface{})[resourcesType].([]interface{})
 		for i, resource := range resources {
@@ -99,7 +102,10 @@ func TestECSContainerInstanceEventMarshaling(t *testing.T) {
 			}
 		}
 	}
-	resultJSON, _ := json.Marshal(result)
+	resultJSON, err := json.Marshal(result)
+	if err != nil {
+		t.Errorf("could not marshal event. details: %v", err)
+	}
 
 	assert.JSONEq(t, string(outputJSON), string(resultJSON))
 }