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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Xunit.Extensions;
namespace Microsoft.TestCommon
{
public class TestDataSetAttribute : DataAttribute
{
public Type DeclaringType { get; set; }
public string PropertyName { get; set; }
public TestDataVariations TestDataVariations { get; set; }
private IEnumerable<Tuple<Type, string>> ExtraDataSets { get; set; }
public TestDataSetAttribute(Type declaringType, string propertyName, TestDataVariations testDataVariations = TestCommon.TestDataVariations.All)
{
DeclaringType = declaringType;
PropertyName = propertyName;
TestDataVariations = testDataVariations;
ExtraDataSets = new List<Tuple<Type, string>>();
}
public TestDataSetAttribute(Type declaringType, string propertyName,
Type declaringType1, string propertyName1,
TestDataVariations testDataVariations = TestCommon.TestDataVariations.All)
: this(declaringType, propertyName, testDataVariations)
{
ExtraDataSets = new List<Tuple<Type, string>> { Tuple.Create(declaringType1, propertyName1) };
}
public TestDataSetAttribute(Type declaringType, string propertyName,
Type declaringType1, string propertyName1,
Type declaringType2, string propertyName2,
TestDataVariations testDataVariations = TestCommon.TestDataVariations.All)
: this(declaringType, propertyName, testDataVariations)
{
ExtraDataSets = new List<Tuple<Type, string>> { Tuple.Create(declaringType1, propertyName1), Tuple.Create(declaringType2, propertyName2) };
}
public TestDataSetAttribute(Type declaringType, string propertyName,
Type declaringType1, string propertyName1,
Type declaringType2, string propertyName2,
Type declaringType3, string propertyName3,
TestDataVariations testDataVariations = TestCommon.TestDataVariations.All)
: this(declaringType, propertyName, testDataVariations)
{
ExtraDataSets = new List<Tuple<Type, string>> { Tuple.Create(declaringType1, propertyName1), Tuple.Create(declaringType2, propertyName2), Tuple.Create(declaringType3, propertyName3) };
}
public TestDataSetAttribute(Type declaringType, string propertyName,
Type declaringType1, string propertyName1,
Type declaringType2, string propertyName2,
Type declaringType3, string propertyName3,
Type declaringType4, string propertyName4,
TestDataVariations testDataVariations = TestCommon.TestDataVariations.All)
: this(declaringType, propertyName, testDataVariations)
{
ExtraDataSets = new List<Tuple<Type, string>>
{
Tuple.Create(declaringType1, propertyName1), Tuple.Create(declaringType2, propertyName2),
Tuple.Create(declaringType3, propertyName3), Tuple.Create(declaringType4, propertyName4)
};
}
public override IEnumerable<object[]> GetData(MethodInfo methodUnderTest, Type[] parameterTypes)
{
IEnumerable<object[]> baseDataSet = GetBaseDataSet(DeclaringType, PropertyName, TestDataVariations);
IEnumerable<IEnumerable<object[]>> extraDataSets = GetExtraDataSets();
IEnumerable<IEnumerable<object[]>> finalDataSets = (new[] { baseDataSet }).Concat(extraDataSets);
var datasets = CrossProduct(finalDataSets);
return datasets;
}
private static IEnumerable<object[]> CrossProduct(IEnumerable<IEnumerable<object[]>> datasets)
{
if (datasets.Count() == 1)
{
foreach (var dataset in datasets.First())
{
yield return dataset;
}
}
else
{
IEnumerable<object[]> datasetLeft = datasets.First();
IEnumerable<object[]> datasetRight = CrossProduct(datasets.Skip(1));
foreach (var dataLeft in datasetLeft)
{
foreach (var dataRight in datasetRight)
{
yield return dataLeft.Concat(dataRight).ToArray();
}
}
}
}
// The base data set(first one) can either be a TestDataSet or a TestDataSetCollection
private static IEnumerable<object[]> GetBaseDataSet(Type declaringType, string propertyName, TestDataVariations variations)
{
return TryGetDataSetFromTestDataCollection(declaringType, propertyName, variations) ?? GetDataSet(declaringType, propertyName);
}
private IEnumerable<IEnumerable<object[]>> GetExtraDataSets()
{
foreach (var tuple in ExtraDataSets)
{
yield return GetDataSet(tuple.Item1, tuple.Item2);
}
}
private static object GetTestDataPropertyValue(Type declaringType, string propertyName)
{
PropertyInfo property = declaringType.GetProperty(propertyName, BindingFlags.Static | BindingFlags.Public);
if (property == null)
{
throw new ArgumentException(string.Format("Could not find public static property {0} on {1}", propertyName, declaringType.FullName));
}
else
{
return property.GetValue(null, null);
}
}
private static IEnumerable<object[]> GetDataSet(Type declaringType, string propertyName)
{
object propertyValue = GetTestDataPropertyValue(declaringType, propertyName);
// box the dataset items if the property is not a RefTypeTestData
IEnumerable<object> value = (propertyValue as IEnumerable<object>) ?? (propertyValue as IEnumerable).Cast<object>();
if (value == null)
{
throw new InvalidOperationException(string.Format("{0}.{1} is either null or does not implement IEnumerable", declaringType.FullName, propertyName));
}
IEnumerable<object[]> dataset = value as IEnumerable<object[]>;
if (dataset != null)
{
return dataset;
}
else
{
return value.Select((data) => new object[] { data });
}
}
private static IEnumerable<object[]> TryGetDataSetFromTestDataCollection(Type declaringType, string propertyName, TestDataVariations variations)
{
object propertyValue = GetTestDataPropertyValue(declaringType, propertyName);
IEnumerable<TestData> testDataCollection = propertyValue as IEnumerable<TestData>;
return testDataCollection == null ? null : GetDataSetFromTestDataCollection(testDataCollection, variations);
}
private static IEnumerable<object[]> GetDataSetFromTestDataCollection(IEnumerable<TestData> testDataCollection, TestDataVariations variations)
{
foreach (TestData testdataInstance in testDataCollection)
{
foreach (TestDataVariations variation in testdataInstance.GetSupportedTestDataVariations())
{
if ((variation & variations) == variation)
{
Type variationType = testdataInstance.GetAsTypeOrNull(variation);
object testData = testdataInstance.GetAsTestDataOrNull(variation);
if (AsSingleInstances(variation))
{
foreach (object obj in (IEnumerable)testData)
{
yield return new object[] { variationType, obj };
}
}
else
{
yield return new object[] { variationType, testData };
}
}
}
}
}
private static bool AsSingleInstances(TestDataVariations variation)
{
return variation == TestDataVariations.AsInstance ||
variation == TestDataVariations.AsNullable ||
variation == TestDataVariations.AsDerivedType ||
variation == TestDataVariations.AsKnownType ||
variation == TestDataVariations.AsDataMember ||
variation == TestDataVariations.AsXmlElementProperty;
}
}
}
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