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Create FloatingRoundtripTests.cs to systematically approach float ser…
…ialization tradeoffs.
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// Copyright (c) Alexandre Mutel. All rights reserved. | ||
// Licensed under the BSD-Clause 2 license. | ||
// See license.txt file in the project root for full license information. | ||
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using NUnit.Framework; | ||
using Tomlyn.Model; | ||
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namespace Tomlyn.Tests | ||
{ | ||
[TestFixture] | ||
public class FloatingRoundtripTests{ | ||
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[TestCase(0.0)] | ||
[TestCase(-0.0)] | ||
[TestCase(1.0)] | ||
[TestCase(-1.0)] | ||
[TestCase(double.PositiveInfinity)] | ||
[TestCase(double.NegativeInfinity)] | ||
[TestCase(double.NaN)] | ||
#if NET8_0_OR_GREATER | ||
[TestCase(double.NegativeZero)] | ||
#endif | ||
[TestCase(double.Epsilon)] | ||
[TestCase(-double.Epsilon)] | ||
// [TestCase(0.1)] - - These fail. Adjusting g16->g17 fixes some but not all. | ||
// [TestCase(0.99)] | ||
// [TestCase(0.3)] | ||
// [TestCase(double.MinValue)] | ||
// [TestCase(double.MaxValue)] | ||
public void TestDoublesRoundtrip(double number) | ||
{ | ||
// we want to increment f64 by the smallest possible value | ||
// and verify it changes the serialized value | ||
// IEEE 754 compliance means -0.0 and +0.0 are different | ||
// special values +inf=inf, -inf, nan=+nan, -nan | ||
var model = new TomlTable | ||
{ | ||
["float"] = (float)number, | ||
["double"] = number | ||
}; | ||
var toml = Toml.FromModel(model); | ||
var parsed = Toml.Parse(toml); | ||
var parsedDouble = (double)parsed.ToModel()["double"]; | ||
var parsedFloat = (double)parsed.ToModel()["float"]; | ||
Assert.True(number == parsedDouble || double.IsNaN(number), | ||
$"(f64->str->f64) expected {number:g30} but got {parsedDouble:g30}. \nString form: \n{toml}"); | ||
Assert.AreEqual(number, parsedDouble); | ||
Assert.True((float)number == parsedFloat || double.IsNaN(number), | ||
$"(f64->f32->str->f64->f32) expected {(float)number:g30} but got {parsedFloat:g30}. \nString form: \n{toml}"); | ||
Assert.AreEqual((float)number, parsedFloat); | ||
} | ||
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[TestCase(0.0f)] | ||
[TestCase(-0.0f)] | ||
[TestCase(1.0f)] | ||
[TestCase(-1.0f)] | ||
[TestCase(float.PositiveInfinity)] | ||
[TestCase(float.NegativeInfinity)] | ||
[TestCase(float.NaN)] | ||
#if NET8_0_OR_GREATER | ||
[TestCase(float.NegativeZero)] | ||
#endif | ||
[TestCase(float.Epsilon)] | ||
[TestCase(-float.Epsilon)] | ||
// [TestCase(0.1f)] - These fail. Adjusting g16->g17 fixes them | ||
// [TestCase(0.99f)] | ||
// [TestCase(0.3f)] | ||
// [TestCase(float.MinValue)] | ||
// [TestCase(float.MaxValue)] | ||
public void TestFloatsRoundtrip(float number) | ||
{ | ||
var model = new TomlTable | ||
{ | ||
["float"] = number, | ||
["double"] = (double)number | ||
}; | ||
var toml = Toml.FromModel(model); | ||
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var parsed = Toml.Parse(toml); | ||
var parsedDouble = (double)parsed.ToModel()["double"]; | ||
var parsedFloatAsDouble = (double)parsed.ToModel()["float"]; | ||
Assert.True((double)number == parsedDouble || double.IsNaN(number), | ||
$"(f32->f64->str->f64) expected double {(double)number:g64} but got double {parsedDouble:g64}. \nString form: \n{toml}"); | ||
Assert.True(number == (float)parsedFloatAsDouble || double.IsNaN(number), | ||
$"(f32->str->f64->f32) expected float {number:g64} but got float {(float)parsedFloatAsDouble:g64}. \nString form: \n{toml}"); | ||
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} | ||
} | ||
} |