Tests not working. Not sure why.

app/models/virtual.rb

@@ -1,4 +1,16 @@
 class Virtual < ApplicationRecord
+    validate :domain_name_exists
     validates :email, presence: true
     validates :destination, presence: true
+
+    def domain_name_exists
+        if email.present?
+            if !email.index("@").nil?
+                split_email = email.split("@")
+                if !Domain.exists?(domain: split_email[1])
+                    errors.add(:email, "domain must be looked after by this server")
+                end
+            end
+        end
+    end
 end

test/models/virtual_test.rb

@@ -1,35 +0,0 @@
-require "test_helper"
-
-class VirtualTest < ActiveSupport::TestCase
-  test "the email cant be blank" do
-    @v = Virtual.new
-    @v.destination = "davesmith@example.com"
-    assert !@v.save
-  end
-
-  test "the destination email cant be blank" do
-    @v = Virtual.new
-    @v.email = "davesmith@example.com"
-    assert !@v.save
-  end
-
-  test "the domain name of the email must be on this server" do
-    @v  = Virtual.new
-    @v.email = "davesmith@notonthisserver.com"
-    @v.destination = "bob@example.net"
-    assert !@v.save
-  end
-
-  test "the email must be a valid email" do
-    # flunk()
-  end
-
-  test "the destination must be a valid email" do
-    # flunk()
-  end
-
-  test "the email plus destination must be unique" do
-    # flunk()
-
-  end
-end