System.Numerics.Tests.cast_fromTest.RunUInt64ExplicitCastFromBigIntegerTests C# (CSharp) Метод

        public static void RunUInt64ExplicitCastFromBigIntegerTests()
        {
            ulong value;
            BigInteger bigInteger;

            // UInt64 Explicit Cast from BigInteger: Random value < UInt64.MinValue
            bigInteger = GenerateRandomBigIntegerLessThan(0, s_random);
            value = BitConverter.ToUInt64(ByteArrayMakeMinSize(bigInteger.ToByteArray(), 8), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt64ExplicitCastFromBigInteger(value, bigInteger));

            // UInt64 Explicit Cast from BigInteger: UInt64.MinValue - 1
            bigInteger = new BigInteger(UInt64.MinValue);
            bigInteger -= BigInteger.One;
            value = BitConverter.ToUInt64(new byte[] { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, 0);
            Assert.Throws<OverflowException>(() => VerifyUInt64ExplicitCastFromBigInteger(value, bigInteger));

            // UInt64 Explicit Cast from BigInteger: UInt64.MinValue
            VerifyUInt64ExplicitCastFromBigInteger(UInt64.MinValue);

            // UInt64 Explicit Cast from BigInteger: 0
            VerifyUInt64ExplicitCastFromBigInteger(0);

            // UInt64 Explicit Cast from BigInteger: 1
            VerifyUInt64ExplicitCastFromBigInteger(1);

            // UInt64 Explicit Cast from BigInteger: Random Positive
            for (int i = 0; i < NumberOfRandomIterations; ++i)
            {
                VerifyUInt64ExplicitCastFromBigInteger((UInt64)(UInt64.MaxValue * s_random.NextDouble()));
            }

            // UInt64 Explicit Cast from BigInteger: UInt64.MaxValue
            VerifyUInt64ExplicitCastFromBigInteger(UInt64.MaxValue);

            // UInt64 Explicit Cast from BigInteger: UInt64.MaxValue + 1
            bigInteger = new BigInteger(UInt64.MaxValue);
            bigInteger += BigInteger.One;
            value = BitConverter.ToUInt64(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt64ExplicitCastFromBigInteger(value, bigInteger));

            // UInt64 Explicit Cast from BigInteger: Random value > UInt64.MaxValue
            bigInteger = GenerateRandomBigIntegerGreaterThan(UInt64.MaxValue, s_random);
            value = BitConverter.ToUInt64(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt64ExplicitCastFromBigInteger(value, bigInteger));
        }