System.Numerics.Tests.cast_fromTest.RunInt32ExplicitCastFromBigIntegerTests C# (CSharp) Method

        public static void RunInt32ExplicitCastFromBigIntegerTests()
        {
            int value;
            BigInteger bigInteger;

            // Int32 Explicit Cast from BigInteger: Random value < Int32.MinValue
            bigInteger = GenerateRandomBigIntegerLessThan(Int32.MinValue, s_random);
            value = BitConverter.ToInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyInt32ExplicitCastFromBigInteger(value, bigInteger));

            // Int32 Explicit Cast from BigInteger: Int32.MinValue - 1
            bigInteger = new BigInteger(Int32.MinValue);
            bigInteger -= BigInteger.One;
            value = BitConverter.ToInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyInt32ExplicitCastFromBigInteger(value, bigInteger));

            // Int32 Explicit Cast from BigInteger: Int32.MinValue
            VerifyInt32ExplicitCastFromBigInteger(Int32.MinValue);

            // Int32 Explicit Cast from BigInteger: Random Negative
            for (int i = 0; i < NumberOfRandomIterations; ++i)
            {
                VerifyInt32ExplicitCastFromBigInteger((Int32)s_random.Next(Int32.MinValue, 0));
            }

            // Int32 Explicit Cast from BigInteger: -1
            VerifyInt32ExplicitCastFromBigInteger(-1);

            // Int32 Explicit Cast from BigInteger: 0
            VerifyInt32ExplicitCastFromBigInteger(0);

            // Int32 Explicit Cast from BigInteger: 1
            VerifyInt32ExplicitCastFromBigInteger(1);

            // Int32 Explicit Cast from BigInteger: Random Positive
            for (int i = 0; i < NumberOfRandomIterations; ++i)
            {
                VerifyInt32ExplicitCastFromBigInteger((Int32)s_random.Next(1, Int32.MaxValue));
            }

            // Int32 Explicit Cast from BigInteger: Int32.MaxValue
            VerifyInt32ExplicitCastFromBigInteger(Int32.MaxValue);

            // Int32 Explicit Cast from BigInteger: Int32.MaxValue + 1
            bigInteger = new BigInteger(Int32.MaxValue);
            bigInteger += BigInteger.One;
            value = BitConverter.ToInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyInt32ExplicitCastFromBigInteger(value, bigInteger));

            // Int32 Explicit Cast from BigInteger: Random value > Int32.MaxValue
            bigInteger = GenerateRandomBigIntegerGreaterThan(Int32.MaxValue, s_random);
            value = BitConverter.ToInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyInt32ExplicitCastFromBigInteger(value, bigInteger));
        }