all model tests now pass

app/models/credential.rb

@@ -1,2 +1,5 @@
 class Credential < ApplicationRecord
+    validates :email, presence: true
+    validates :email, uniqueness: true
+    validates :email, format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i , message: "email must be valid"}
 end

app/models/virtual.rb

@@ -2,6 +2,9 @@ class Virtual < ApplicationRecord
     validate :domain_name_exists
     validates :email, presence: true
     validates :destination, presence: true
+    validates :email, format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i , message: "email must be valid"}
+    validates :destination, format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i , message: "destination must be valid"}
+    validates :destination, uniqueness: {scope: :email, message: "a redirection pair must be unique"}
 
     def domain_name_exists
         if email.present?

test/models/credential_test.rb

@@ -1,7 +1,20 @@
 require "test_helper"
 
 class CredentialTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
+  test "email must be present" do
+    @c = Credential.new
+    assert !@c.save
+  end
+
+  test "email must be valid" do
+    @c = Credential.new
+    @c.email = "not on your nelly"
+    assert !@c.save
+  end
+
+  test "email must be unique" do
+    @c = Credential.new
+    @c.email = "bob@example.net"
+    assert !@c.save
+  end
 end

test/models/virtual_test.rb

@@ -0,0 +1,42 @@
+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
+    @v = Virtual.new
+    @v.email = "something not quiet right"
+    assert !@v.save
+  end
+
+  test "the destination must be a valid email" do
+    @v = Virtual.new
+    @v.destination = "this will never work"
+    assert !@v.save
+  end
+
+  test "the email plus destination must be unique" do
+    @v = Virtual.new
+    @v.email = "abuse@example.net"
+    @v.destination ="bob@example.net"
+    assert !@v.save
+  end
+
+end