68 lines
2.2 KiB
C#
68 lines
2.2 KiB
C#
using System.Numerics;
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using FluentAssertions;
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using PerfectNumbers.Core;
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using Xunit;
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namespace PerfectNumbers.Core.Tests;
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[Trait("Category", "Fast")]
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public class ULongExtensionsMultiplyShiftTests
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{
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[Theory]
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[InlineData(0UL, 0UL, 1)]
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[InlineData(1UL, 3UL, 1)]
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[InlineData(ulong.MaxValue, 3UL, 3)]
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[InlineData(0xFFFF_FFFF_FFFF_FFFFUL, 5UL, 4)]
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[InlineData(0x8000_0000_0000_0000UL, 7UL, 5)]
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public void MultiplyShiftRight_matches_big_integer(ulong value, ulong multiplier, int shift)
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{
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BigInteger expected = ((BigInteger)value * multiplier) >> shift;
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ulong result = ULongExtensions.MultiplyShiftRight(value, multiplier, shift);
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result.Should().Be((ulong)expected);
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}
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[Theory]
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[InlineData(0UL, 0UL, 1)]
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[InlineData(1UL, 3UL, 1)]
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[InlineData(ulong.MaxValue, 3UL, 3)]
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[InlineData(0xFFFF_FFFF_FFFF_FFFFUL, 5UL, 4)]
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[InlineData(0x8000_0000_0000_0000UL, 7UL, 5)]
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[InlineData(0xDEAD_BEEF_DEAD_BEEFUL, 11UL, 63)]
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public void MultiplyShiftRightShiftFirst_matches_big_integer(ulong value, ulong multiplier, int shift)
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{
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BigInteger expected = ((BigInteger)value * multiplier) >> shift;
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ulong result = ULongExtensions.MultiplyShiftRightShiftFirst(value, multiplier, shift);
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result.Should().Be((ulong)expected);
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}
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[Fact]
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public void MultiplyShiftRightShiftFirst_returns_zero_when_shift_is_large()
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{
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ULongExtensions.MultiplyShiftRightShiftFirst(ulong.MaxValue, 123UL, 64).Should().Be(0UL);
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}
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[Theory]
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[InlineData(0UL, ulong.MaxValue, -1)]
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[InlineData(1UL, 1UL, -3)]
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public void MultiplyShiftRight_throws_when_shift_is_negative(ulong value, ulong multiplier, int shift)
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{
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Action act = () => ULongExtensions.MultiplyShiftRight(value, multiplier, shift);
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act.Should().Throw<ArgumentOutOfRangeException>();
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}
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[Theory]
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[InlineData(0UL, ulong.MaxValue, -1)]
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[InlineData(1UL, 1UL, -3)]
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public void MultiplyShiftRightShiftFirst_throws_when_shift_is_negative(ulong value, ulong multiplier, int shift)
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{
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Action act = () => ULongExtensions.MultiplyShiftRightShiftFirst(value, multiplier, shift);
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act.Should().Throw<ArgumentOutOfRangeException>();
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}
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}
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