added username (models.CharField) & searchable (models.BooleanField) to User model in lyric app; new ITs confirm functionality here; dashboard views now ensure that sharing a list w. an email address (as opposed to a username) neither confirms nor denies whether that email address has a registered account (ITs green)

src/apps/lyric/tests/integrated/test_models.py

@@ -18,6 +18,16 @@ class UserModelTest(TestCase):
         user = User(id="123")
         self.assertEqual(user.pk, "123")
 
+    def test_user_can_have_a_username(self):
+        user = User.objects.create(email="a@b.cde")
+        user.username = "stardust"
+        user.save()
+        self.assertEqual(User.objects.get(pk=user.pk).username, "stardust")
+
+    def test_searchable_defaults_to_false(self):
+        user = User.objects.create(email="a@b.cde")
+        self.assertFalse(user.searchable)
+
 class TokenModelTest(TestCase):
     def test_links_user_with_autogen_uid(self):
         token1 = Token.objects.create(email="a@b.cde")