public void ThrowOnStringConcatenation()
{
using (MemoryRestrictor.StartNoAlloc())
{
String s = String.Concat("A", "B");
MemoryRestrictor.EndNoAlloc();
Assert.AreEqual(s.Length, 2);
}
}
public void ThrowOnBoxing()
{
using (MemoryRestrictor.StartNoAlloc())
{
int intValue = 0x123123;
Object boxed = (Object)intValue;
MemoryRestrictor.EndNoAlloc();
Assert.IsTrue(String.Concat(boxed) == "123123");
}
}
public void ThrowOnAllocation()
{
using (MemoryRestrictor.StartNoAlloc())
{
Object obj = new Object();
MemoryRestrictor.EndNoAlloc();
// Need to use 'obj' variable to prevent being optimized out.
Assert.IsNotNull(obj);
}
}
public void Int32BoxingTest()
{
using (MemoryRestrictor.StartNoAlloc())
{
int val = 12345678;
using (ClassAllocator.Box(val, out Object boxed))
{
MemoryRestrictor.EndNoAlloc();
Assert.AreEqual(val, boxed);
}
}
}
public void UninitializedAllocationTest()
{
Object original = FormatterServices.GetUninitializedObject(typeof(DummyClass));
using (MemoryRestrictor.StartNoAlloc())
{
using (ClassAllocator.UninitializedAllocation(out DummyClass uheapObj))
{
MemoryRestrictor.EndNoAlloc();
Assert.AreEqual(DummyClass.UninitializedIntField, uheapObj.IntField);
Assert.AreEqual(original, uheapObj);
}
}
}
public void ThrowOnLinq()
{
int[] array = new int[] { 1, 2, 3, 4 };
using (MemoryRestrictor.StartNoAlloc())
{
// Enumerable.Sum(this IEnumerable`1) extension method internally uses
// IEnumerable`1.GetEnumerator, and invoking IEnumerable`1.GetEnumerator
// on array makes allocation. (See SZArrayHelper.GetEnumerator method)
int sum = array.Sum();
MemoryRestrictor.EndNoAlloc();
Assert.AreEqual(sum, 10);
}
}
