xunit: define codefixes for CollectionAsserts

[Meir017]

The asserts defined in https://github.com/xunit/assert.xunit/blob/main/CollectionAsserts.cs

• All
• AllAsync?
• Collection
• CollectionAsync?
• Contains
• Distinct
• DoesNotContain
• Empty
• NotEmpty
• Equal
• NotEqual
• Single

[Meir017]

All:

public void All<T>(IEnumerable<T> collection, T expected)
{
    Assert.All(collection, x => Assert.Equal(expected, x));
    collection.Should().OnlyContain(x => x.Should().Be(expected));

    Assert.All(collection, x => Assert.NotEqual(expected, x));
    collection.Should().NotContain(x => x.Should().NotBe(expected));

    Assert.All(collection, x => Assert.Same(expected, x));
    collection.Should().OnlyContain(x => x.Should().BeSameAs(expected));

    Assert.All(collection, x => Assert.NotSame(expected, x));
    collection.Should().NotContain(x => x.Should().NotBeSameAs(expected));

    Assert.All(collection, i => Assert.IsType<int>(expected));
    collection.Should().AllBeOfType<int>();

    Assert.All(collection, i => Assert.IsAssignableFrom<int>(expected));
    collection.Should().AllBeAssignableTo<int>();
}

[Meir017]

Collection:

public void Collection<T>(IEnumerable<T> collection, params Action<T>[] elementInspectors)
{
    T expected = default;
    Assert.Collection(collection,
        x => Assert.Equal(x, expected),
        x => Assert.NotEqual(x, expected),
        x => Assert.Same(x, expected),
        x => Assert.NotSame(x, expected),
        x => Assert.IsType<int>(expected),
        x => Assert.IsAssignableFrom<int>(x)
    );
    collection.Should().Satisfy(
        x => x.Equals(expected),
        x => !x.Equals(expected),
        x => ReferenceEquals(expected, x),
        x => !ReferenceEquals(expected, x),
        x => x.GetType() == typeof(int),
        x => x.GetType().IsAssignableFrom(typeof(int))
    );
}