public void TestMultiplyAsyncException(int a, int b)
{
AsyncUtil obj = new AsyncUtil();
Assert.ThrowsAsync <InvalidOperationException>(async() => await obj.MultiplyAsync(a, b));
}
public async Task <int> TestMultiplyAsync(int a, int b)
{
AsyncUtil obj = new AsyncUtil();
return(await obj.MultiplyAsync(a, b));
}