public void EnumerationShouldHaveExpectedResults(int[] expectedCharacters, XUnitSerializableString text)
{
var enumerable = ((string)text).AsPermissiveCodePointEnumerable();
// Test C# foreach enumeration
{
int i = 0;
foreach (int codePoint in enumerable)
{
Assert.Equal(expectedCharacters[i++], codePoint);
}
Assert.Equal(expectedCharacters.Length, i);
}
// Test generic enumerable
Assert.Equal(expectedCharacters, from codePoint in enumerable select codePoint);
// Test legacy enumeration
{
// We could use Enumerable.Cast<>, but we can't guarantee that the LINQ implementation we use wouldn't be smart and cast IEnumerable back to IEnumerable<int>
var legacyEnumerator = ((IEnumerable)enumerable).GetEnumerator();
int index = 0;
while (legacyEnumerator.MoveNext())
{
Assert.True(index < expectedCharacters.Length);
Assert.Equal(expectedCharacters[index++], Assert.IsType <int>(legacyEnumerator.Current));
}
Assert.Equal(expectedCharacters.Length, index);
}
}
public void EnumerationOfInvalidUtf16StringsShouldThrowArgumentException(XUnitSerializableString text)
=> Assert.Throws <ArgumentException>(() => { foreach (int codePoint in ((string)text).AsCodePointEnumerable())
{
}
});