fix: Issue #4142 (#4144)

* Tweaks test in order to show the error

- Session is effectively created when it should not

* Do not create a session when users need verified accounts on signup

spec/ValidationAndPasswordsReset.spec.js

@@ -258,7 +258,10 @@ describe("Custom Pages, Email Verification, Password Reset", () => {
         user.setUsername("zxcv");
         user.set("email", "testInvalidConfig@parse.com");
         user.signUp(null)
-          .then(() => Parse.User.logIn("zxcv", "asdf"))
+          .then((user) => {
+            expect(user.getSessionToken()).toBe(undefined);
+            return Parse.User.logIn("zxcv", "asdf");
+          })
           .then(() => {
             fail('login should have failed');
             done();