public async Task ReadAsync_ReadsIAsyncEnumerable()
{
// Arrange
var options = new MvcOptions();
var reader = new AsyncEnumerableReader(options);
// Act
var result = await reader.ReadAsync(TestEnumerable());
// Assert
var collection = Assert.IsAssignableFrom <ICollection <string> >(result);
Assert.Equal(new[] { "0", "1", "2", }, collection);
}
public async Task ReadAsync_ReadsIAsyncEnumerable_ImplementingMultipleAsyncEnumerableInterfaces()
{
// This test ensures the reader does not fail if you have a type that implements IAsyncEnumerable for multiple Ts
// Arrange
var options = new MvcOptions();
var reader = new AsyncEnumerableReader(options);
// Act
var result = await reader.ReadAsync(new MultiAsyncEnumerable());
// Assert
var collection = Assert.IsAssignableFrom <ICollection <object> >(result);
Assert.Equal(new[] { "0", "1", "2", }, collection);
}
public async Task ReadAsync_ThrowsIfBufferimitIsReached()
{
// Arrange
var enumerable = TestEnumerable(11);
var expected = $"'AsyncEnumerableReader' reached the configured maximum size of the buffer when enumerating a value of type '{enumerable.GetType()}'. " +
"This limit is in place to prevent infinite streams of 'IAsyncEnumerable<>' from continuing indefinitely. If this is not a programming mistake, " +
$"consider ways to reduce the collection size, or consider manually converting '{enumerable.GetType()}' into a list rather than increasing the limit.";
var options = new MvcOptions {
MaxIAsyncEnumerableBufferLimit = 10
};
var reader = new AsyncEnumerableReader(options);
// Act
var ex = await Assert.ThrowsAsync <InvalidOperationException>(() => reader.ReadAsync(enumerable));
// Assert
Assert.Equal(expected, ex.Message);
}