drop cap ab test: misc fixes (#12694)

test/api/unit/models/user.test.js

@@ -592,6 +592,20 @@ describe('User Model', () => {
   });
 
   context('pre-save hook', () => {
+    it('enrolls users that signup through web in the Drop Cap AB test', async () => {
+      let user = new User();
+      user.registeredThrough = 'habitica-web';
+      user = await user.save();
+      expect(user._ABtests.dropCapNotif).to.exist;
+    });
+
+    it('does not enroll users that signup through modal in the Drop Cap AB test', async () => {
+      let user = new User();
+      user.registeredThrough = 'habitica-ios';
+      user = await user.save();
+      expect(user._ABtests.dropCapNotif).to.not.exist;
+    });
+
     it('marks the last news post as read for new users', async () => {
       const lastNewsPost = { _id: '1' };
       sandbox.stub(NewsPost, 'lastNewsPost').returns(lastNewsPost);