public void AddHeader()
{
using (CancellationTokenSource tokenSource = new CancellationTokenSource())
{
CallOptions original = CreateCallOptions(tokenSource.Token);
CallOptions callOptions = original;
callOptions = callOptions.AddHeader("a", "0");
callOptions = callOptions.AddHeader("b", "1");
Assert.AreEqual(true, callOptions.ContainsHeader("a"));
Assert.AreEqual(true, callOptions.ContainsHeader("b"));
Assert.AreEqual("1", callOptions.Headers.GetStringValueOrNull("a"));
Assert.AreEqual(original.WriteOptions, callOptions.WriteOptions);
Assert.AreEqual(original.CancellationToken, callOptions.CancellationToken);
Assert.AreEqual(original.PropagationToken, callOptions.PropagationToken);
Assert.AreEqual(original.Credentials, callOptions.Credentials);
}
}