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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.ComponentModel.DataAnnotations
{
using System.Data.Entity.Resources;
using Xunit;
public class MaxLengthAttributeTests
{
[Fact]
public void Length_returns_set_length()
{
Assert.Equal(-1, new MaxLengthAttribute().Length);
Assert.Equal(-1, new MaxLengthAttribute(-1).Length);
Assert.Equal(10, new MaxLengthAttribute(10).Length);
// These only throw when IsValid is called
Assert.Equal(0, new MaxLengthAttribute(0).Length);
Assert.Equal(-10, new MaxLengthAttribute(-10).Length);
}
[Fact]
public void IsValid_throws_for_negative_or_zero_lengths_other_than_negative_one()
{
var attribute1 = new MaxLengthAttribute(-10);
Assert.Equal(
Strings.MaxLengthAttribute_InvalidMaxLength,
Assert.Throws<InvalidOperationException>(() => attribute1.IsValid("Rincewind")).Message);
var attribute2 = new MaxLengthAttribute(0);
Assert.Equal(
Strings.MaxLengthAttribute_InvalidMaxLength,
Assert.Throws<InvalidOperationException>(() => attribute2.IsValid("Twoflower")).Message);
}
[Fact]
public void IsValid_throws_for_object_that_is_not_string_or_array()
{
Assert.Throws<InvalidCastException>(() => new MaxLengthAttribute().IsValid(new Random()));
}
[Fact]
public void IsValid_returns_true_for_null()
{
Assert.True(new MaxLengthAttribute(10).IsValid(null));
}
[Fact]
public void IsValid_validates_string_length()
{
Assert.True(new MaxLengthAttribute().IsValid("The Luggage"));
Assert.True(new MaxLengthAttribute(10).IsValid("Hrun"));
Assert.True(new MaxLengthAttribute(18).IsValid("Mr. Ronald Saveloy"));
Assert.True(new MaxLengthAttribute(-1).IsValid("Cohen"));
Assert.False(new MaxLengthAttribute(5).IsValid("Mad Hamish"));
}
[Fact]
public void IsValid_validates_array_length()
{
Assert.True(new MaxLengthAttribute().IsValid(new int[500]));
Assert.True(new MaxLengthAttribute(10).IsValid(new string[7]));
Assert.True(new MaxLengthAttribute(10).IsValid(new string[10]));
Assert.True(new MaxLengthAttribute(-1).IsValid(new object[500]));
Assert.False(new MaxLengthAttribute(5).IsValid(new byte[6]));
}
}
}
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