Avoided loading newsletter subscription events if threshold is Infinity

- if the threshold is Infinity, we shouldn't be loading the newsletter
  subscription events because we are saying there is no threshold
- the code has a quick path to avoid comparing the values, but it still
  loads the events upfront
- this commit moves the quick path up to return earlier
- this has the nice side-effect of producing 100% coverage on this
  package

ghost/verification-trigger/lib/verification-trigger.js

@@ -69,6 +69,11 @@ class VerificationTrigger {
     }
 
     async testImportThreshold() {
+        if (!isFinite(this._configThreshold)) {
+            // Infinite threshold, quick path
+            return;
+        }
+
         const createdAt = new Date();
         createdAt.setDate(createdAt.getDate() - 30);
         const events = await this._eventRepository.getNewsletterSubscriptionEvents({}, {
@@ -76,11 +81,6 @@ class VerificationTrigger {
             'data.created_at': `data.created_at:>'${createdAt.toISOString().replace('T', ' ').substring(0, 19)}'`
         });
 
-        if (!isFinite(this._configThreshold)) {
-            // Inifinte threshold, quick path
-            return;
-        }
-
         const membersTotal = await this._membersStats.getTotalMembers();
 
         // Import threshold is either the total number of members (discounting any created by imports in

ghost/verification-trigger/test/verification-trigger.test.js

@@ -233,4 +233,40 @@ describe('Email verification flow', function () {
             amountImported: 10
         });
     });
+
+    it('Does not fetch events and trigger when threshold is Infinity', async function () {
+        const emailStub = sinon.stub().resolves(null);
+        const settingsStub = sinon.stub().resolves(null);
+        const eventStub = sinon.stub().resolves({
+            meta: {
+                pagination: {
+                    total: 10
+                }
+            }
+        });
+
+        const trigger = new VerificationTrigger({
+            configThreshold: Infinity,
+            Settings: {
+                edit: settingsStub
+            },
+            membersStats: {
+                getTotalMembers: () => 15
+            },
+            isVerified: () => false,
+            isVerificationRequired: () => false,
+            sendVerificationEmail: emailStub,
+            eventRepository: {
+                getNewsletterSubscriptionEvents: eventStub
+            }
+        });
+
+        await trigger.testImportThreshold();
+
+        // We shouldn't be fetching the events if the threshold is Infinity
+        eventStub.callCount.should.eql(0);
+
+        // We shouldn't be sending emails if the threshold is infinity
+        emailStub.callCount.should.eql(0);
+    });
 });