Set required email app settings in integration test

Author: nblumhardt

test/SeqCli.EndToEnd/AppInstance/AppInstanceBasicsTestCase.cs

@@ -21,7 +21,7 @@ public async Task ExecuteAsync(SeqConnection connection, ILogger logger, CliComm
         var app = (await connection.Apps.ListAsync()).Single();
 
         var title = Guid.NewGuid().ToString("N");
-        exit = runner.Exec("appinstance create", $"-t {title} --app {app.Id} -p To=");
+        exit = runner.Exec("appinstance create", $"-t {title} --app {app.Id} -p To=[email protected] -p [email protected]");
         Assert.Equal(0, exit);
 
         var appInstance = (await connection.AppInstances.ListAsync()).Single();
@@ -42,4 +42,4 @@ public async Task ExecuteAsync(SeqConnection connection, ILogger logger, CliComm
         exit = runner.Exec("appinstance list", $"-t {title}");
         Assert.Equal(0, exit);
     }
-}
+}