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Fixed System.Tests.DateTimeTests.TryFormat_MatchesToString test (#87693)

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Co-authored-by: Stephen Toub <stoub@microsoft.com>
This commit is contained in:
Alexander Radchenko 2023-06-20 03:05:54 +06:00 • committed by GitHub
parent e834d4256a
commit 35a598be7a
Signed by: github
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 42 additions and 36 deletions
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78
src/libraries/System.Runtime/tests/System/DateTimeTests.cs
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@ -2735,48 +2735,54 @@ namespace System.Tests
public static void TryFormat_MatchesToString(string format)
{
DateTime dt = DateTime.UtcNow;
string expected = dt.ToString(format);
// UTF16
foreach (CultureInfo culture in CultureInfo.GetCultures(CultureTypes.AllCultures))
{
// Just the right length, succeeds
Span<char> dest = new char[expected.Length];
Assert.True(dt.TryFormat(dest, out int charsWritten, format));
Assert.Equal(expected.Length, charsWritten);
Assert.Equal<char>(expected.ToCharArray(), dest.ToArray());
using (new ThreadCultureChange(culture))
{
string expected = dt.ToString(format);
// Too short, fails
dest = new char[expected.Length - 1];
Assert.False(dt.TryFormat(dest, out charsWritten, format));
Assert.Equal(0, charsWritten);
// UTF16
{
// Just the right length, succeeds
Span<char> dest = new char[expected.Length];
Assert.True(dt.TryFormat(dest, out int charsWritten, format));
Assert.Equal(expected.Length, charsWritten);
Assert.Equal<char>(expected.ToCharArray(), dest.ToArray());
// Longer than needed, succeeds
dest = new char[expected.Length + 1];
Assert.True(dt.TryFormat(dest, out charsWritten, format));
Assert.Equal(expected.Length, charsWritten);
Assert.Equal<char>(expected.ToCharArray(), dest.Slice(0, expected.Length).ToArray());
Assert.Equal(0, dest[dest.Length - 1]);
}
// Too short, fails
dest = new char[expected.Length - 1];
Assert.False(dt.TryFormat(dest, out charsWritten, format));
Assert.Equal(0, charsWritten);
// UTF8
{
// Just the right length, succeeds
Span<byte> dest = new byte[Encoding.UTF8.GetByteCount(expected)];
Assert.True(dt.TryFormat(dest, out int bytesWritten, format));
Assert.Equal(dest.Length, bytesWritten);
Assert.Equal(expected, Encoding.UTF8.GetString(dest));
// Longer than needed, succeeds
dest = new char[expected.Length + 1];
Assert.True(dt.TryFormat(dest, out charsWritten, format));
Assert.Equal(expected.Length, charsWritten);
Assert.Equal<char>(expected.ToCharArray(), dest.Slice(0, expected.Length).ToArray());
Assert.Equal(0, dest[dest.Length - 1]);
}
// Too short, fails
dest = new byte[Encoding.UTF8.GetByteCount(expected) - 1];
Assert.False(dt.TryFormat(dest, out bytesWritten, format));
Assert.Equal(0, bytesWritten);
// UTF8
{
// Just the right length, succeeds
Span<byte> dest = new byte[Encoding.UTF8.GetByteCount(expected)];
Assert.True(dt.TryFormat(dest, out int bytesWritten, format));
Assert.Equal(dest.Length, bytesWritten);
Assert.Equal(expected, Encoding.UTF8.GetString(dest));
// Longer than needed, succeeds
dest = new byte[Encoding.UTF8.GetByteCount(expected) + 1];
Assert.True(dt.TryFormat(dest, out bytesWritten, format));
Assert.Equal(dest.Length - 1, bytesWritten);
Assert.Equal(expected, Encoding.UTF8.GetString(dest.Slice(0, bytesWritten)));
Assert.Equal(0, dest[dest.Length - 1]);
// Too short, fails
dest = new byte[Encoding.UTF8.GetByteCount(expected) - 1];
Assert.False(dt.TryFormat(dest, out bytesWritten, format));
Assert.Equal(0, bytesWritten);
// Longer than needed, succeeds
dest = new byte[Encoding.UTF8.GetByteCount(expected) + 1];
Assert.True(dt.TryFormat(dest, out bytesWritten, format));
Assert.Equal(dest.Length - 1, bytesWritten);
Assert.Equal(expected, Encoding.UTF8.GetString(dest.Slice(0, bytesWritten)));
Assert.Equal(0, dest[dest.Length - 1]);
}
}
}
}