Add email to Yahoo tests

Add a test for the email claim for the Yahoo provider.
Relates to #488.

Author: martincostello

test/AspNet.Security.OAuth.Providers.Tests/Yahoo/YahooTests.cs

@@ -28,6 +28,7 @@ protected internal override void RegisterAuthentication(AuthenticationBuilder bu
         }
 
         [Theory]
+        [InlineData(ClaimTypes.Email, "john@john-smith.local")]
         [InlineData(ClaimTypes.NameIdentifier, "my-id")]
         [InlineData(ClaimTypes.Name, "John Smith")]
         [InlineData("urn:yahoo:familyname", "Smith")]

test/AspNet.Security.OAuth.Providers.Tests/Yahoo/bundle.json

@@ -17,6 +17,7 @@
       "contentFormat": "json",
       "contentJson": {
         "sub": "my-id",
+        "email": "john@john-smith.local",
         "name": "John Smith",
         "family_name": "Smith",
         "given_name": "John",