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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using Moq;
using Xunit;
namespace System.Web.Helpers.Test
{
public class WebGridDataSourceTest
{
[Fact]
public void WebGridDataSourceReturnsNumberOfItemsAsTotalRowCount()
{
// Arrange
var rows = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canPage: false, canSort: false);
// Act and Assert
Assert.Equal(rows.Count(), dataSource.TotalRowCount);
}
[Fact]
public void WebGridDataSourceReturnsUnsortedListIfSortColumnIsNull()
{
// Arrange
var values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canPage: false, canSort: true);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = null }, 0);
// Assert
Assert.True(Enumerable.SequenceEqual<object>(values.ToList(), rows.Select(r => r.Value).ToList(), new PersonComparer()));
}
[Fact]
public void WebGridDataSourceReturnsUnsortedListIfSortColumnIsEmpty()
{
// Arrange
var values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canPage: false, canSort: true);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = String.Empty }, 0);
// Assert
Assert.True(Enumerable.SequenceEqual<object>(values.ToList(), rows.Select(r => r.Value).ToList(), new PersonComparer()));
}
[Fact]
public void WebGridDataSourceReturnsUnsortedListIfSortCannotBeInferred()
{
// Arrange
var values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canPage: false, canSort: true);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "Does-not-exist" }, 0);
// Assert
Assert.True(Enumerable.SequenceEqual<object>(values.ToList(), rows.Select(r => r.Value).ToList(), new PersonComparer()));
}
[Fact]
public void WebGridDataSourceReturnsUnsortedListIfDefaultSortCannotBeInferred()
{
// Arrange
var values = GetValues();
var defaultSort = new SortInfo { SortColumn = "cannot-be-inferred" };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canSort: true, canPage: false) { DefaultSort = defaultSort };
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "Does-not-exist" }, 0);
// Assert
Assert.True(Enumerable.SequenceEqual<object>(values.ToList(), rows.Select(r => r.Value).ToList(), new PersonComparer()));
}
[Fact]
public void WebGridDataSourceUsesDefaultSortWhenCurrentSortCannotBeInferred()
{
// Arrange
var values = GetValues();
var defaultSort = new SortInfo { SortColumn = "FirstName" };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: GetValues(), elementType: typeof(Person), canSort: true, canPage: false) { DefaultSort = defaultSort };
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "Does-not-exist" }, 0);
// Assert
Assert.True(Enumerable.SequenceEqual<object>(values.OrderBy(p => p.FirstName).ToList(), rows.Select(r => r.Value).ToList(), new PersonComparer()));
}
[Fact]
public void WebGridDataSourceSortsUsingSpecifiedSort()
{
// Arrange
var defaultSort = new SortInfo { SortColumn = "FirstName", SortDirection = SortDirection.Ascending };
IEnumerable<dynamic> values = new[] { new Person { LastName = "Z" }, new Person { LastName = "X" }, new Person { LastName = "Y" } };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(Person), canSort: true, canPage: false) { DefaultSort = defaultSort };
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "LastName" }, 0);
// Assert
Assert.Equal(rows.ElementAt(0).Value.LastName, "X");
Assert.Equal(rows.ElementAt(1).Value.LastName, "Y");
Assert.Equal(rows.ElementAt(2).Value.LastName, "Z");
}
[Fact]
public void WebGridDataSourceSortsDynamicType()
{
// Arrange
IEnumerable<dynamic> values = new[] { new TestDynamicType("col", "val1"), new TestDynamicType("col", "val2"), new TestDynamicType("col", "val3") };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(TestDynamicType), canSort: true, canPage: false);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "col", SortDirection = SortDirection.Descending }, 0);
// Assert
Assert.Equal(rows.ElementAt(0).Value.col, "val3");
Assert.Equal(rows.ElementAt(1).Value.col, "val2");
Assert.Equal(rows.ElementAt(2).Value.col, "val1");
}
[Fact]
public void WebGridDataSourceWithNestedPropertySortsCorrectly()
{
// Arrange
var element1 = new { Foo = new { Bar = "val2" } };
var element2 = new { Foo = new { Bar = "val1" } };
var element3 = new { Foo = new { Bar = "val3" } };
IEnumerable<dynamic> values = new[] { element1, element2, element3 };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: element1.GetType(), canSort: true, canPage: false);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "Foo.Bar", SortDirection = SortDirection.Descending }, 0);
// Assert
Assert.Equal(rows.ElementAt(0).Value.Foo.Bar, "val3");
Assert.Equal(rows.ElementAt(1).Value.Foo.Bar, "val2");
Assert.Equal(rows.ElementAt(2).Value.Foo.Bar, "val1");
}
[Fact]
public void WebGridDataSourceSortsDictionaryBasedDynamicType()
{
// Arrange
var value1 = new DynamicDictionary();
value1["col"] = "val1";
var value2 = new DynamicDictionary();
value2["col"] = "val2";
var value3 = new DynamicDictionary();
value3["col"] = "val3";
IEnumerable<dynamic> values = new[] { value1, value2, value3 };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(TestDynamicType), canSort: true, canPage: false);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "col", SortDirection = SortDirection.Descending }, 0);
// Assert
Assert.Equal(rows.ElementAt(0).Value.col, "val3");
Assert.Equal(rows.ElementAt(1).Value.col, "val2");
Assert.Equal(rows.ElementAt(2).Value.col, "val1");
}
[Fact]
public void WebGridDataSourceReturnsOriginalDataSourceIfValuesCannotBeSorted()
{
// Arrange
IEnumerable<dynamic> values = new object[] { new TestDynamicType("col", "val1"), new TestDynamicType("col", "val2"), new TestDynamicType("col", DBNull.Value) };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(TestDynamicType), canSort: true, canPage: false);
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "col", SortDirection = SortDirection.Descending }, 0);
// Assert
Assert.Equal(rows.ElementAt(0).Value.col, "val1");
Assert.Equal(rows.ElementAt(1).Value.col, "val2");
Assert.Equal(rows.ElementAt(2).Value.col, DBNull.Value);
}
[Fact]
public void WebGridDataSourceReturnsPagedResultsIfRowsPerPageIsSpecified()
{
// Arrange
IEnumerable<dynamic> values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(Person), canSort: false, canPage: true) { RowsPerPage = 2 };
// Act
var rows = dataSource.GetRows(new SortInfo(), 0);
// Assert
Assert.Equal(rows.Count, 2);
Assert.Equal(rows.ElementAt(0).Value.LastName, "B2");
Assert.Equal(rows.ElementAt(1).Value.LastName, "A2");
}
[Fact]
public void WebGridDataSourceReturnsPagedSortedResultsIfRowsPerPageAndSortAreSpecified()
{
// Arrange
IEnumerable<dynamic> values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(Person), canSort: true, canPage: true) { RowsPerPage = 2 };
// Act
var rows = dataSource.GetRows(new SortInfo { SortColumn = "LastName", SortDirection = SortDirection.Descending }, 0);
// Assert
Assert.Equal(rows.Count, 2);
Assert.Equal(rows.ElementAt(0).Value.LastName, "E2");
Assert.Equal(rows.ElementAt(1).Value.LastName, "D2");
}
[Fact]
public void WebGridDataSourceReturnsFewerThanRowsPerPageIfNumberOfItemsIsInsufficient()
{
// Arrange
IEnumerable<dynamic> values = GetValues();
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(Person), canSort: true, canPage: true) { RowsPerPage = 3 };
// Act
var rows = dataSource.GetRows(new SortInfo(), 1);
// Assert
Assert.Equal(rows.Count, 2);
Assert.Equal(rows.ElementAt(0).Value.LastName, "C2");
Assert.Equal(rows.ElementAt(1).Value.LastName, "E2");
}
[Fact]
public void WebGridDataSourceDoesNotThrowIfValuesAreNull()
{
// Arrange
IEnumerable<dynamic> values = new object[] { String.Empty, null, DBNull.Value, null };
var dataSource = new WebGridDataSource(new WebGrid(GetContext()), values: values, elementType: typeof(object), canSort: true, canPage: true) { RowsPerPage = 2 };
// Act
var rows = dataSource.GetRows(new SortInfo(), 0);
// Assert
Assert.Equal(rows.Count, 2);
Assert.Equal(rows.ElementAt(0).Value, String.Empty);
Assert.Null(rows.ElementAt(1).Value);
}
private IEnumerable<Person> GetValues()
{
return new[]
{
new Person { FirstName = "B1", LastName = "B2" },
new Person { FirstName = "A1", LastName = "A2" },
new Person { FirstName = "D1", LastName = "D2" },
new Person { FirstName = "C1", LastName = "C2" },
new Person { FirstName = "E1", LastName = "E2" },
};
}
private class PersonComparer : IEqualityComparer<object>
{
public new bool Equals(object x, object y)
{
dynamic xDynamic = x;
dynamic yDynamic = y;
return (String.Equals(xDynamic.FirstName, yDynamic.FirstName, StringComparison.OrdinalIgnoreCase)
&& String.Equals(xDynamic.LastName, yDynamic.LastName, StringComparison.OrdinalIgnoreCase));
}
public int GetHashCode(dynamic obj)
{
return 4; // Random dice roll
}
}
private class TestDynamicType : DynamicObject
{
public Dictionary<string, object> _values = new Dictionary<string, object>();
public TestDynamicType(string a, object b)
{
_values[a] = b;
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
return _values.TryGetValue(binder.Name, out result);
}
}
private class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
}
private HttpContextBase GetContext()
{
return new Mock<HttpContextBase>().Object;
}
}
}
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