AI-Studio/app/Tests/Chat/TokenAmountTests.cs

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using System.Globalization;
using AIStudio.Chat;
namespace AIStudio.Tests.Chat;
/// <summary>
/// Checks how a number of tokens is written under the input field.
/// </summary>
/// <remarks>
/// The culture is an argument rather than something taken from the machine, and that is the point
/// being checked as much as the digits are: AI Studio's language is chosen in its own settings, so
/// the thread's culture says nothing about which separators a person expects to read.
/// </remarks>
[TestFixture]
public sealed class TokenAmountTests
{
private static readonly CultureInfo AMERICAN = CultureInfo.GetCultureInfo("en-US");
private static readonly CultureInfo GERMAN = CultureInfo.GetCultureInfo("de-DE");
[TestCase(0, "0")]
[TestCase(7, "7")]
[TestCase(847, "847")]
[TestCase(999, "999", Description = "The last number written out in full.")]
[TestCase(1_000, "1.00k")]
[TestCase(1_234, "1.23k")]
[TestCase(12_347, "12.35k")]
[TestCase(128_000, "128.00k")]
[TestCase(400_000, "400.00k")]
[TestCase(999_499, "999.50k")]
[TestCase(999_999, "1.00M", Description = "Rounded before the unit is chosen, so it does not read as 1,000.00k.")]
[TestCase(1_000_000, "1.00M")]
[TestCase(1_048_576, "1.05M")]
[TestCase(1_050_000, "1.05M", Description = "Which is how OpenAI writes it themselves.")]
[TestCase(2_000_000, "2.00M")]
public void ANumberOfTokensIsWrittenTheWayItIsRead(int tokens, string wanted)
{
Assert.That(TokenAmount.Format(tokens, AMERICAN), Is.EqualTo(wanted));
}
[TestCase(999, "999")]
[TestCase(1_234, "1,23k")]
[TestCase(400_000, "400,00k")]
[TestCase(1_048_576, "1,05M")]
public void TheSeparatorsAreTheOnesTheUserKnows(int tokens, string wanted)
{
//
// A German reads 1,23k where an American reads 1.23k. Writing either of them the other way
// around reads as a number a thousand times off.
//
Assert.That(TokenAmount.Format(tokens, GERMAN), Is.EqualTo(wanted));
}
}