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src/HotChocolate/Core/test/Abstractions.Tests/AsyncEnumerableExecutableTests.cs
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using System; | ||
using System.Collections; | ||
using System.Collections.Generic; | ||
using System.Linq; | ||
using System.Linq.Expressions; | ||
using System.Threading; | ||
using System.Threading.Tasks; | ||
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namespace HotChocolate; | ||
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public static class AsyncEnumerableExecutableTests | ||
{ | ||
[Fact] | ||
public static async Task EmptyAsyncEnumerable_FirstOrDefault_Null() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new EmptyAsyncEnumerable(); | ||
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// act | ||
var result = await Executable.From(query).FirstOrDefaultAsync(); | ||
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// assert | ||
Assert.Null(result); | ||
} | ||
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[Fact] | ||
public static async Task ListAsyncEnumerable_FirstOrDefault_A() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new ListAsyncEnumerable(["a", "b"]); | ||
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// act | ||
var result = await Executable.From(query).FirstOrDefaultAsync(); | ||
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// assert | ||
Assert.Equal("a", result); | ||
} | ||
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[Fact] | ||
public static async Task EmptyAsyncEnumerable_SingleOrDefault_Null() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new EmptyAsyncEnumerable(); | ||
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// act | ||
var result = await Executable.From(query).FirstOrDefaultAsync(); | ||
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// assert | ||
Assert.Null(result); | ||
} | ||
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[Fact] | ||
public static async Task ListAsyncEnumerable_SingleOrDefault_A() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new ListAsyncEnumerable(["a"]); | ||
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// act | ||
var result = await Executable.From(query).FirstOrDefaultAsync(); | ||
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// assert | ||
Assert.Equal("a", result); | ||
} | ||
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[Fact] | ||
public static async Task ListAsyncEnumerable_SingleOrDefault_Throw() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new ListAsyncEnumerable(["a", "b"]); | ||
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// act | ||
async Task Error() => await Executable.From(query).SingleOrDefaultAsync(); | ||
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// assert | ||
await Assert.ThrowsAsync<GraphQLException>(Error); | ||
} | ||
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[Fact] | ||
public static async Task ListAsyncEnumerable_ToListAsync() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new ListAsyncEnumerable(["a", "b"]); | ||
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// act | ||
var result = await Executable.From(query).ToListAsync(); | ||
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// assert | ||
Assert.Collection( | ||
result, | ||
r => Assert.Equal("a", r), | ||
r => Assert.Equal("b", r)); | ||
} | ||
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[Fact] | ||
public static async Task ListAsyncEnumerable_ToAsyncEnumerable() | ||
{ | ||
// arrange | ||
IAsyncEnumerable<string> query = new ListAsyncEnumerable(["a", "b"]); | ||
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// act | ||
var result = Executable.From(query).ToAsyncEnumerable(); | ||
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// assert | ||
await foreach (var item in result) | ||
{ | ||
Assert.True(item is "a" or "b"); | ||
} | ||
} | ||
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private class EmptyAsyncEnumerable : IQueryable<string>, IAsyncEnumerable<string> | ||
{ | ||
public Type ElementType | ||
=> throw new NotSupportedException(); | ||
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public Expression Expression | ||
=> throw new NotSupportedException(); | ||
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public IQueryProvider Provider | ||
=> throw new NotSupportedException(); | ||
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public IEnumerator<string> GetEnumerator() | ||
=> throw new NotSupportedException(); | ||
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IEnumerator IEnumerable.GetEnumerator() | ||
=> throw new NotSupportedException(); | ||
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public async IAsyncEnumerator<string> GetAsyncEnumerator(CancellationToken cancellationToken = default) | ||
{ | ||
await new ValueTask(); | ||
yield break; | ||
} | ||
} | ||
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private class ListAsyncEnumerable(string[] items) : IQueryable<string>, IAsyncEnumerable<string> | ||
{ | ||
public Type ElementType | ||
=> throw new NotSupportedException(); | ||
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public Expression Expression | ||
=> throw new NotSupportedException(); | ||
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public IQueryProvider Provider | ||
=> throw new NotSupportedException(); | ||
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public IEnumerator<string> GetEnumerator() | ||
=> throw new NotSupportedException(); | ||
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IEnumerator IEnumerable.GetEnumerator() | ||
=> throw new NotSupportedException(); | ||
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public async IAsyncEnumerator<string> GetAsyncEnumerator(CancellationToken cancellationToken = default) | ||
{ | ||
await new ValueTask(); | ||
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foreach (var item in items) | ||
{ | ||
yield return item; | ||
} | ||
} | ||
} | ||
} |
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