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- // Licensed to the .NET Foundation under one or more agreements.
- // The .NET Foundation licenses this file to you under the MIT License.
- // See the LICENSE file in the project root for more information.
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Threading.Tasks;
- using Xunit;
- namespace Tests
- {
- public class Scan : AsyncEnumerableExTests
- {
- [Fact]
- public void Scan_Null()
- {
- Assert.Throws<ArgumentNullException>(() => AsyncEnumerableEx.Scan(default(IAsyncEnumerable<int>), 3, (x, y) => x + y));
- Assert.Throws<ArgumentNullException>(() => AsyncEnumerableEx.Scan(Return42, 3, default(Func<int, int, int>)));
- Assert.Throws<ArgumentNullException>(() => AsyncEnumerableEx.Scan(default(IAsyncEnumerable<int>), (x, y) => x + y));
- Assert.Throws<ArgumentNullException>(() => AsyncEnumerableEx.Scan(Return42, default(Func<int, int, int>)));
- }
- [Fact]
- public async Task Scan1Async()
- {
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan(8, (x, y) => x + y);
- var e = xs.GetAsyncEnumerator();
- await HasNextAsync(e, 9);
- await HasNextAsync(e, 11);
- await HasNextAsync(e, 14);
- await NoNextAsync(e);
- }
- [Fact]
- public async Task Scan2Async()
- {
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan((x, y) => x + y);
- var e = xs.GetAsyncEnumerator();
- await HasNextAsync(e, 3);
- await HasNextAsync(e, 6);
- await NoNextAsync(e);
- }
- [Fact]
- public async Task Scan3()
- {
- var ex = new Exception("Bang!");
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan(8, new Func<int, int, int>((x, y) => { throw ex; }));
- var e = xs.GetAsyncEnumerator();
- await AssertThrowsAsync(e.MoveNextAsync(), ex);
- }
- [Fact]
- public async Task Scan4()
- {
- var ex = new Exception("Bang!");
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan(new Func<int, int, int>((x, y) => { throw ex; }));
- var e = xs.GetAsyncEnumerator();
- await AssertThrowsAsync(e.MoveNextAsync(), ex);
- }
- [Fact]
- public async Task Scan5()
- {
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan(8, (x, y) => x + y);
- await SequenceIdentity(xs);
- }
- [Fact]
- public async Task Scan6()
- {
- var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable().Scan((x, y) => x + y);
- await SequenceIdentity(xs);
- }
- }
- }
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