System.Numerics.Tests.cast_fromTest.RunUInt16ExplicitCastFromBigIntegerTests C# (CSharp) Méthode

        public static void RunUInt16ExplicitCastFromBigIntegerTests()
        {
            ushort value;
            BigInteger bigInteger;

            // UInt16 Explicit Cast from BigInteger: Random value < UInt16.MinValue
            bigInteger = GenerateRandomBigIntegerLessThan(UInt16.MinValue, s_random);
            value = BitConverter.ToUInt16(ByteArrayMakeMinSize(bigInteger.ToByteArray(), 2), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt16ExplicitCastFromBigInteger(value, bigInteger));

            // UInt16 Explicit Cast from BigInteger: UInt16.MinValue - 1
            bigInteger = new BigInteger(UInt16.MinValue);
            bigInteger -= BigInteger.One;
            value = BitConverter.ToUInt16(new byte[] { 0xff, 0xff }, 0);
            Assert.Throws<OverflowException>(() => VerifyUInt16ExplicitCastFromBigInteger(value, bigInteger));

            // UInt16 Explicit Cast from BigInteger: UInt16.MinValue
            VerifyUInt16ExplicitCastFromBigInteger(UInt16.MinValue);

            // UInt16 Explicit Cast from BigInteger: 0
            VerifyUInt16ExplicitCastFromBigInteger(0);

            // UInt16 Explicit Cast from BigInteger: 1
            VerifyUInt16ExplicitCastFromBigInteger(1);

            // UInt16 Explicit Cast from BigInteger: Random Positive
            for (int i = 0; i < NumberOfRandomIterations; ++i)
            {
                VerifyUInt16ExplicitCastFromBigInteger((UInt16)s_random.Next(1, UInt16.MaxValue));
            }

            // UInt16 Explicit Cast from BigInteger: UInt16.MaxValue
            VerifyUInt16ExplicitCastFromBigInteger(UInt16.MaxValue);

            // UInt16 Explicit Cast from BigInteger: UInt16.MaxValue + 1
            bigInteger = new BigInteger(UInt16.MaxValue);
            bigInteger += BigInteger.One;
            value = BitConverter.ToUInt16(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt16ExplicitCastFromBigInteger(value, bigInteger));

            // UInt16 Explicit Cast from BigInteger: Random value > UInt16.MaxValue
            bigInteger = GenerateRandomBigIntegerGreaterThan(UInt16.MaxValue, s_random);
            value = BitConverter.ToUInt16(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt16ExplicitCastFromBigInteger(value, bigInteger));
        }