Create schema for RequestVerifyCodeSchema

Previously we were using a schema that mapped onto db.Model. However, the json
in the request did not reflect the VerfiyCode db Model.
I did not add validation on the to field, we did not have that previously.

tests/app/user/test_rest_verify.py

@@ -348,3 +348,21 @@ def test_send_user_code_for_email_uses_optional_to_field(notify_api,
                                                                   '11111',
                                                                   'notify@digital.cabinet-office.gov.uk',
                                                                   'Verification code')
+
+
+def test_request_verify_code_schema_invalid_code_type(notify_api, notify_db, notify_db_session, sample_user):
+    import json
+    from app.schemas import request_verify_code_schema
+    data = json.dumps({'code_type': 'not_sms'})
+    code, error = request_verify_code_schema.loads(data)
+    assert code == {}
+    assert error == {'code_type': ['Invalid code type']}
+
+
+def test_request_verify_code_schema_with_to(notify_api, notify_db, notify_db_session, sample_user):
+    import json
+    from app.schemas import request_verify_code_schema
+    data = json.dumps({'code_type': 'sms', 'to': 'some@one.gov.uk'})
+    code, error = request_verify_code_schema.loads(data)
+    assert code == {'code_type': 'sms', 'to': 'some@one.gov.uk'}
+    assert error == {}