all model tests now pass

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