Test shopify application subscription

Shopify Apps
,
1

How to test Shopify application subscription / recurring process. I am using appSubscriptionCreate for creating subscriptions and referance from This Docs. In this appSubscriptionCreate method, I pass “test”: true, but when the subscription is created that time automatically sets the subscription test as false. then what is the issue? and I attached my code with this. please check that.

const createResponse = await client.query({
        data: {
          "query": `mutation AppSubscriptionCreate($name: String!, $lineItems: [AppSubscriptionLineItemInput!]!, $returnUrl: URL!) {
            appSubscriptionCreate(name: $name, returnUrl: $returnUrl, lineItems: $lineItems) {
              userErrors {
                field
                message
              }
              appSubscription {
                createdAt
                currentPeriodEnd
                id
                name
                returnUrl
                status
                test
                trialDays
              }
              confirmationUrl
            }
          }`,
          "variables": {
            "name": MONTHLY_PLAN,
            "returnUrl": "https://admin.shopify.com/store/test-app/apps/my-node-app-324/pricing",
            "test": true,
            "lineItems": [
              {
                "plan": {
                  "appRecurringPricingDetails": {
                    "price": {
                      "amount": billingPlan.amount,
                      "currencyCode": billingPlan.currencyCode
                    },
                    "interval": billingPlan.interval
                  }
                }
              }
            ]
          },
        },
      });