public virtual void TestEnsureCapacity()
{
Int64BitSet bits = new Int64BitSet(5);
bits.Set(1);
bits.Set(4);
Int64BitSet newBits = Int64BitSet.EnsureCapacity(bits, 8); // grow within the word
Assert.IsTrue(newBits.Get(1));
Assert.IsTrue(newBits.Get(4));
newBits.Clear(1);
// we align to 64-bits, so even though it shouldn't have, it re-allocated a long[1]
Assert.IsTrue(bits.Get(1));
Assert.IsFalse(newBits.Get(1));
newBits.Set(1);
newBits = Int64BitSet.EnsureCapacity(newBits, newBits.Length - 2); // reuse
Assert.IsTrue(newBits.Get(1));
bits.Set(1);
newBits = Int64BitSet.EnsureCapacity(bits, 72); // grow beyond one word
Assert.IsTrue(newBits.Get(1));
Assert.IsTrue(newBits.Get(4));
newBits.Clear(1);
// we grew the long[], so it's not shared
Assert.IsTrue(bits.Get(1));
Assert.IsFalse(newBits.Get(1));
}
