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SingleAsync code coverage.
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@bartdesmet
bartdesmet committed Feb 20, 2019
1 parent 75ff7a5 commit ce701cf
Showing 1 changed file with 148 additions and 37 deletions.
185 changes: 148 additions & 37 deletions Ix.NET/Source/System.Linq.Async.Tests/System/Linq/Operators/Single.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,107 +13,218 @@ namespace Tests
public class Single : AsyncEnumerableTests
{
[Fact]
public async Task Single_Null()
public async Task SingleAsync_Null()
{
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default).AsTask());

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, CancellationToken.None).AsTask());
}

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => true).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, bool>)).AsTask());
[Fact]
public async Task SingleAsync_Empty()
{
var res = AsyncEnumerable.Empty<int>().SingleAsync();
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => true, CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, bool>), CancellationToken.None).AsTask());
[Fact]
public async Task SingleAsync_Empty_IList()
{
var res = new int[0].ToAsyncEnumerable().SingleAsync();
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => new ValueTask<bool>(true)).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, ValueTask<bool>>)).AsTask());
[Fact]
public async Task SingleAsync_Single()
{
var res = Return42.SingleAsync();
Assert.Equal(42, await res);
}

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => new ValueTask<bool>(true), CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, ValueTask<bool>>), CancellationToken.None).AsTask());
[Fact]
public async Task SingleAsync_Simple()
{
var res = new[] { 1, 2, 3, 4, 5 }.ToAsyncEnumerable().Where(x => x == 4).SingleAsync();
Assert.Equal(4, await res);
}

#if !NO_DEEP_CANCELLATION
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, (x, ct) => new ValueTask<bool>(true), CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, CancellationToken, ValueTask<bool>>), CancellationToken.None).AsTask());
#endif
[Fact]
public async Task SingleAsync_Throws_Source()
{
var ex = new Exception("Bang!");
var res = Throw<int>(ex).SingleAsync();
await AssertThrowsAsync(res, ex);
}

[Fact]
public async Task Single1Async()
public async Task SingleAsync_Throw_MoreThanOne_IList()
{
var res = AsyncEnumerable.Empty<int>().SingleAsync();
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync();
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task Single2Async()
public async Task SingleAsync_Throw_MoreThanOne()
{
var res = AsyncEnumerable.Empty<int>().SingleAsync(x => true);
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().Select(x => x).SingleAsync();
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task Single3Async()
public async Task SingleAsync_Predicate_Null()
{
var res = Return42.SingleAsync(x => x % 2 != 0);
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => true).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, bool>)).AsTask());

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => true, CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, bool>), CancellationToken.None).AsTask());
}

[Fact]
public async Task SingleAsync_Predicate_Empty()
{
var res = AsyncEnumerable.Empty<int>().SingleAsync(x => true);
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task Single4Async()
public async Task SingleAsync_Predicate_NoMatch()
{
var res = Return42.SingleAsync();
Assert.Equal(42, await res);
var res = Return42.SingleAsync(x => x % 2 != 0);
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task Single5Async()
public async Task SingleAsync_Predicate_Simple()
{
var res = Return42.SingleAsync(x => x % 2 == 0);
Assert.Equal(42, await res);
}

[Fact]
public async Task Single6Async()
public async Task SingleAsync_Predicate_Throws()
{
var ex = new Exception("Bang!");
var res = Throw<int>(ex).SingleAsync();
var res = Throw<int>(ex).SingleAsync(x => true);
await AssertThrowsAsync(res, ex);
}

[Fact]
public async Task Single7Async()
public async Task SingleAsync_Predicate_OneMatch()
{
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => x % 2 != 0);
Assert.Equal(45, await res);
}

[Fact]
public async Task SingleAsync_Predicate_Throw_MoreThanOne()
{
var res = new[] { 42, 23, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => x % 2 != 0);
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Null()
{
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => new ValueTask<bool>(true)).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, ValueTask<bool>>)).AsTask());

await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, x => new ValueTask<bool>(true), CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, ValueTask<bool>>), CancellationToken.None).AsTask());
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Empty()
{
var res = AsyncEnumerable.Empty<int>().SingleAsync(x => new ValueTask<bool>(true));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task SingleAsync_AsyncPredicate_NoMatch()
{
var res = Return42.SingleAsync(x => new ValueTask<bool>(x % 2 != 0));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Simple()
{
var res = Return42.SingleAsync(x => new ValueTask<bool>(x % 2 == 0));
Assert.Equal(42, await res);
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Throws()
{
var ex = new Exception("Bang!");
var res = Throw<int>(ex).SingleAsync(x => true);
var res = Throw<int>(ex).SingleAsync(x => new ValueTask<bool>(true));
await AssertThrowsAsync(res, ex);
}

[Fact]
public async Task Single8Async()
public async Task SingleAsync_AsyncPredicate_OneMatch()
{
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync();
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => new ValueTask<bool>(x % 2 != 0));
Assert.Equal(45, await res);
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Throw_MoreThanOne()
{
var res = new[] { 42, 23, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => new ValueTask<bool>(x % 2 != 0));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

#if !NO_DEEP_CANCELLATION
[Fact]
public async Task Single9Async()
public async Task SingleAsync_AsyncPredicate_Cancel_Null()
{
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => x % 2 != 0);
Assert.Equal(45, await res);
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync<int>(default, (x, ct) => new ValueTask<bool>(true), CancellationToken.None).AsTask());
await Assert.ThrowsAsync<ArgumentNullException>(() => AsyncEnumerable.SingleAsync(Return42, default(Func<int, CancellationToken, ValueTask<bool>>), CancellationToken.None).AsTask());
}

[Fact]
public async Task Single10Async()
public async Task SingleAsync_AsyncPredicate_Cancel_Empty()
{
var res = new[] { 42, 23, 45, 90 }.ToAsyncEnumerable().SingleAsync(x => x % 2 != 0);
var res = AsyncEnumerable.Empty<int>().SingleAsync((x, ct) => new ValueTask<bool>(true));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task Single11Async()
public async Task SingleAsync_AsyncPredicate_Cancel_NoMatch()
{
var res = new int[0].ToAsyncEnumerable().SingleAsync();
var res = Return42.SingleAsync((x, ct) => new ValueTask<bool>(x % 2 != 0));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Cancel_Simple()
{
var res = Return42.SingleAsync((x, ct) => new ValueTask<bool>(x % 2 == 0));
Assert.Equal(42, await res);
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Cancel_Throws()
{
var ex = new Exception("Bang!");
var res = Throw<int>(ex).SingleAsync((x, ct) => new ValueTask<bool>(true));
await AssertThrowsAsync(res, ex);
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Cancel_OneMatch()
{
var res = new[] { 42, 45, 90 }.ToAsyncEnumerable().SingleAsync((x, ct) => new ValueTask<bool>(x % 2 != 0));
Assert.Equal(45, await res);
}

[Fact]
public async Task SingleAsync_AsyncPredicate_Cancel_Throw_MoreThanOne()
{
var res = new[] { 42, 23, 45, 90 }.ToAsyncEnumerable().SingleAsync((x, ct) => new ValueTask<bool>(x % 2 != 0));
await AssertThrowsAsync<InvalidOperationException>(res.AsTask());
}
#endif
}
}

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