public void TryGetPostalName_Existing_Returns_True()
{
Assert.True(PostCodes.TryGetPostalName("4550", out var postalName));
Assert.Equal("FARSUND", postalName);
}
public void TryGetPostalName_Missing_Returns_False()
{
Assert.False(PostCodes.TryGetPostalName("9999", out var postalName));
Assert.Null(postalName);
}