/// <summary>
/// Returns the stored value for testing purposes only. This function will attempt to await the
/// last task (if any) writing to the the metric's storage engine before returning a value.
/// @throws [NullPointerException] if no value is stored
/// </summary>
/// <param name="pingName">represents the name of the ping to retrieve the metric for.
/// Defaults to the first value in `sendInPings`</param>
/// <returns>value of the stored metric</returns>
/// <exception cref="System.NullReferenceException">Thrown when the metric contains no value</exception>
public Int32 TestGetValue(string pingName = null)
{
Dispatchers.AssertInTestingMode();
if (!TestHasValue(pingName))
{
throw new NullReferenceException();
}
string ping = pingName ?? sendInPings[0];
return(LibGleanFFI.glean_counter_test_get_value(handle, ping));
}