71 lines
2.6 KiB
C#
71 lines
2.6 KiB
C#
using System.Globalization;
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using Shouldly;
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using Xunit;
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namespace Just.PreciseMath.Tests;
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public class DoubleDoubleSpanFormattingTests
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{
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[Theory]
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[InlineData("")]
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[InlineData("G32")]
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[InlineData("g999")]
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[InlineData("E20")]
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[InlineData("F54")]
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public void SpanFormattingMatchesExactComponentFormatting(string format)
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{
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DoubleDouble value = DoubleDouble.FromComponents(1.0, Math.ScaleB(1.0, -54));
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NumberFormatInfo provider = new() { NumberDecimalSeparator = "::", NegativeSign = "minus" };
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string expected = value.ToString(format, provider);
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char[] buffer = new char[expected.Length + 1];
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buffer[^1] = '!';
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((ISpanFormattable)value).TryFormat(buffer.AsSpan(0, expected.Length), out int written, format, provider).ShouldBeTrue();
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written.ShouldBe(expected.Length);
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new string(buffer, 0, written).ShouldBe(expected);
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buffer[^1].ShouldBe('!');
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}
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[Fact]
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public void DefaultSpanFormattingRetainsLowComponentDigits()
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{
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Span<char> buffer = stackalloc char[64];
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DoubleDouble.FromComponents(1.0, Math.ScaleB(1.0, -54))
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.TryFormat(buffer, out int written, provider: CultureInfo.InvariantCulture).ShouldBeTrue();
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buffer[..written].ToString().ShouldBe("1.0000000000000000555111512312578");
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}
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[Fact]
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public void ShortDestinationIsUnchangedAndReportsZero()
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{
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char[] buffer = ['!', '!'];
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DoubleDouble.Pi.TryFormat(buffer, out int written, "G32", CultureInfo.InvariantCulture).ShouldBeFalse();
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written.ShouldBe(0);
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new string(buffer).ShouldBe("!!");
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DoubleDouble.One.TryFormat(Span<char>.Empty, out written, provider: CultureInfo.InvariantCulture).ShouldBeFalse();
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written.ShouldBe(0);
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}
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[Theory]
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[InlineData(-0.0)]
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[InlineData(double.NaN)]
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[InlineData(double.PositiveInfinity)]
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[InlineData(double.NegativeInfinity)]
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public void SpanFormattingPreservesSpecialValues(double high)
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{
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NumberFormatInfo provider = new() { NegativeSign = "minus", NaNSymbol = "unknown" };
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DoubleDouble value = new(high);
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Span<char> buffer = stackalloc char[64];
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value.TryFormat(buffer, out int written, "F2", provider).ShouldBeTrue();
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buffer[..written].ToString().ShouldBe(value.ToString("F2", provider));
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}
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[Theory]
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[InlineData("R")]
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[InlineData("F1000")]
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[InlineData("G-1")]
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public void InvalidFormatThrowsEvenForEmptyDestination(string format)
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{
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Should.Throw<FormatException>(() => DoubleDouble.One.TryFormat(Span<char>.Empty, out _, format, CultureInfo.InvariantCulture));
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}
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}
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