// Copyright (c) Microsoft. All rights reserved.

// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;

using System.Linq.Expressions;

using Xunit;

namespace System.Linq.Tests

{

public class AnyTests : EnumerableBasedTests

{

[Fact]

public void NoPredicateNullElements()

{

int?[] source = { null, null, null, null };

Assert.True(source.AsQueryable().Any());

}

[Fact]

public void OnlyLastTrue()

{

int[] source = { 5, 9, 3, 7, 4 };

Assert.True(source.AsQueryable().Any(i => i % 2 == 0));

}

[Fact]

public void RangeWithinRange()

{

var array = Enumerable.Range(1, 10).ToArray();

for (var j = 0; j <= 9; j++)

Assert.True(array.AsQueryable().Any(i => i > j));

Assert.False(array.AsQueryable().Any(i => i > 10));

}

[Fact]

public void NullSource()

{

Assert.Throws<ArgumentNullException>("source", () => ((IQueryable<int>)null).Any());

}

[Fact]

public void NullSourcePredicateUsed()

{

Assert.Throws<ArgumentNullException>("source", () => ((IQueryable<int>)null).Any(i => i != 0));

}

[Fact]

public void NullPredicateUsed()

{

Expression<Func<int, bool>> predicate = null;

Assert.Throws<ArgumentNullException>("predicate", () => Enumerable.Range(0, 3).AsQueryable().Any(predicate));

}

[Fact]

public void Any1()

{

var val = (new int[] { 0, 2, 1 }).AsQueryable().Any();

Assert.True(val);

}

[Fact]

public void Any2()

{

var val = (new int[] { 0, 2, 1 }).AsQueryable().Any(n => n > 1);

Assert.True(val);

}

}

}