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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.Linq.Expressions;
using System.Reflection;
using Assert = Microsoft.TestCommon.AssertEx;
namespace Microsoft.TestCommon
{
public class ReflectionAssert
{
private static PropertyInfo GetPropertyInfo<T, TProp>(Expression<Func<T, TProp>> property)
{
if (property.Body is MemberExpression)
{
return (PropertyInfo)((MemberExpression)property.Body).Member;
}
else if (property.Body is UnaryExpression && property.Body.NodeType == ExpressionType.Convert)
{
return (PropertyInfo)((MemberExpression)((UnaryExpression)property.Body).Operand).Member;
}
else
{
throw new InvalidOperationException("Could not determine property from lambda expression.");
}
}
private static void TestPropertyValue<TInstance, TValue>(TInstance instance, Func<TInstance, TValue> getFunc, Action<TInstance, TValue> setFunc, TValue valueToSet, TValue valueToCheck)
{
setFunc(instance, valueToSet);
TValue newValue = getFunc(instance);
Assert.Equal(valueToCheck, newValue);
}
private static void TestPropertyValue<TInstance, TValue>(TInstance instance, Func<TInstance, TValue> getFunc, Action<TInstance, TValue> setFunc, TValue value)
{
TestPropertyValue(instance, getFunc, setFunc, value, value);
}
public void Property<T, TResult>(T instance, Expression<Func<T, TResult>> propertyGetter, TResult expectedDefaultValue, bool allowNull = false, TResult roundTripTestValue = null) where TResult : class
{
PropertyInfo property = GetPropertyInfo(propertyGetter);
Func<T, TResult> getFunc = (obj) => (TResult)property.GetValue(obj, index: null);
Action<T, TResult> setFunc = (obj, value) => property.SetValue(obj, value, index: null);
Assert.Equal(expectedDefaultValue, getFunc(instance));
if (allowNull)
{
TestPropertyValue(instance, getFunc, setFunc, null);
}
else
{
Assert.ThrowsArgumentNull(() =>
{
setFunc(instance, null);
}, "value");
}
if (roundTripTestValue != null)
{
TestPropertyValue(instance, getFunc, setFunc, roundTripTestValue);
}
}
public void IntegerProperty<T, TResult>(T instance, Expression<Func<T, TResult>> propertyGetter, TResult expectedDefaultValue,
TResult? minLegalValue, TResult? illegalLowerValue,
TResult? maxLegalValue, TResult? illegalUpperValue,
TResult roundTripTestValue) where TResult : struct
{
PropertyInfo property = GetPropertyInfo(propertyGetter);
Func<T, TResult> getFunc = (obj) => (TResult)property.GetValue(obj, index: null);
Action<T, TResult> setFunc = (obj, value) => property.SetValue(obj, value, index: null);
Assert.Equal(expectedDefaultValue, getFunc(instance));
if (minLegalValue.HasValue)
{
TestPropertyValue(instance, getFunc, setFunc, minLegalValue.Value);
}
if (maxLegalValue.HasValue)
{
TestPropertyValue(instance, getFunc, setFunc, maxLegalValue.Value);
}
if (illegalLowerValue.HasValue)
{
Assert.ThrowsArgumentGreaterThanOrEqualTo(() => { setFunc(instance, illegalLowerValue.Value); }, "value", minLegalValue.Value.ToString(), illegalLowerValue.Value);
}
if (illegalUpperValue.HasValue)
{
Assert.ThrowsArgumentLessThanOrEqualTo(() => { setFunc(instance, illegalLowerValue.Value); }, "value", maxLegalValue.Value.ToString(), illegalUpperValue.Value);
}
TestPropertyValue(instance, getFunc, setFunc, roundTripTestValue);
}
public void BooleanProperty<T>(T instance, Expression<Func<T, bool>> propertyGetter, bool expectedDefaultValue)
{
PropertyInfo property = GetPropertyInfo(propertyGetter);
Func<T, bool> getFunc = (obj) => (bool)property.GetValue(obj, index: null);
Action<T, bool> setFunc = (obj, value) => property.SetValue(obj, value, index: null);
Assert.Equal(expectedDefaultValue, getFunc(instance));
TestPropertyValue(instance, getFunc, setFunc, !expectedDefaultValue);
}
public void EnumProperty<T, TResult>(T instance, Expression<Func<T, TResult>> propertyGetter, TResult expectedDefaultValue, TResult illegalValue, TResult roundTripTestValue) where TResult : struct
{
PropertyInfo property = GetPropertyInfo(propertyGetter);
Func<T, TResult> getFunc = (obj) => (TResult)property.GetValue(obj, index: null);
Action<T, TResult> setFunc = (obj, value) => property.SetValue(obj, value, index: null);
Assert.Equal(expectedDefaultValue, getFunc(instance));
Assert.ThrowsInvalidEnumArgument(() => { setFunc(instance, illegalValue); }, "value", Convert.ToInt32(illegalValue), typeof(TResult));
TestPropertyValue(instance, getFunc, setFunc, roundTripTestValue);
}
public void StringProperty<T>(T instance, Expression<Func<T, string>> propertyGetter, string expectedDefaultValue,
bool allowNullAndEmpty = true, string nullAndEmptyReturnValue = "")
{
PropertyInfo property = GetPropertyInfo(propertyGetter);
Func<T, string> getFunc = (obj) => (string)property.GetValue(obj, index: null);
Action<T, string> setFunc = (obj, value) => property.SetValue(obj, value, index: null);
Assert.Equal(expectedDefaultValue, getFunc(instance));
if (allowNullAndEmpty)
{
// Assert get/set works for null
TestPropertyValue(instance, getFunc, setFunc, null, nullAndEmptyReturnValue);
// Assert get/set works for String.Empty
TestPropertyValue(instance, getFunc, setFunc, String.Empty, nullAndEmptyReturnValue);
}
else
{
Assert.ThrowsArgumentNullOrEmpty(
delegate()
{
try
{
TestPropertyValue(instance, getFunc, setFunc, null);
}
catch (TargetInvocationException e)
{
throw e.InnerException;
}
},
"value");
Assert.ThrowsArgumentNullOrEmpty(
delegate()
{
try
{
TestPropertyValue(instance, getFunc, setFunc, String.Empty);
}
catch (TargetInvocationException e)
{
throw e.InnerException;
}
},
"value");
}
// Assert get/set works for arbitrary value
TestPropertyValue(instance, getFunc, setFunc, "TestValue");
}
}
}
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