Added webhook fixute utils

refs https://github.com/TryGhost/Toolbox/issues/320

- There will be more webhook e2e tests coming which require easy webhook fixture creation

test/utils/e2e-framework.js

@@ -281,6 +281,13 @@ const getAgentsForMembers = async () => {
     };
 };
 
+const insertWebhook = ({event, url}) => {
+    return fixtureUtils.fixtures.insertWebhook({
+        event: event,
+        target_url: url
+    });
+};
+
 module.exports = {
     // request agent
     agentProvider: {
@@ -297,6 +304,7 @@ module.exports = {
     // DB State Manipulation
     fixtureManager: {
         get: getFixture,
+        insertWebhook: insertWebhook,
         getCurrentOwnerUser: fixtureUtils.getCurrentOwnerUser,
         init: initFixtures,
         restore: resetData,

test/utils/fixture-utils.js

@@ -436,6 +436,16 @@ const fixtures = {
         });
     },
 
+    insertWebhook: function (attributes) {
+        const webhook = DataGenerator.forKnex.createWebhook(
+            Object.assign(attributes, {
+                integration_id: DataGenerator.forKnex.integrations[0].id
+            })
+        );
+
+        return models.Webhook.add(webhook, context.internal);
+    },
+
     insertWebhooks: function insertWebhooks() {
         return Promise.map(DataGenerator.forKnex.webhooks, function (webhook) {
             return models.Webhook.add(webhook, context.internal);