public static async Task WriteTextAsync()
{
var writer = new ArrayBufferWriter <char>();
using var actual = writer.AsTextWriter();
using TextWriter expected = new StringWriter(InvariantCulture);
await actual.WriteAsync("Hello, world!");
await expected.WriteAsync("Hello, world!");
await actual.WriteAsync("123".AsMemory());
await expected.WriteAsync("123".AsMemory());
await actual.WriteAsync('a');
await expected.WriteAsync('a');
await actual.WriteLineAsync();
await expected.WriteLineAsync();
await actual.FlushAsync();
Equal(expected.ToString(), writer.BuildString());
Equal(expected.ToString(), actual.ToString());
}