public void Collections_BitVectorsRangeOperationsTest()
{
const int k_initial_size = Bits.kInt32BitCount;
uint bits = (uint)((1UL << k_initial_size) - 1);
var bs = new BitVector32(bits);
Assert.AreEqual(k_initial_size, bs.Cardinality);
Assert.AreEqual(0, bs.CardinalityZeros);
// clear all but the first bit
bs.ClearBits(1, k_initial_size - 1);
Assert.AreEqual(1, bs.Cardinality);
Assert.AreEqual(k_initial_size - 1, bs.CardinalityZeros);
// set all the modified bits back
bs.SetBits(1, k_initial_size - 1);
Assert.AreEqual(k_initial_size, bs.Cardinality);
Assert.AreEqual(0, bs.CardinalityZeros);
// will invert all the bits (to false)
bs.ToggleBits(0, bs.Length);
Assert.AreEqual(0, bs.Cardinality);
Assert.AreEqual(k_initial_size, bs.CardinalityZeros);
// this should do nothing
bs.SetBits(1, 0);
Assert.AreEqual(0, bs.Cardinality);
Assert.AreEqual(k_initial_size, bs.CardinalityZeros);
Assert.IsFalse(bs.TestBits(0, bs.Length));
bs.SetBits(k_initial_size - 2, 2);
Assert.IsTrue(bs.TestBits(0, bs.Length));
}