testRoundtripWtf16

fn testRoundtripWtf16(wtf16le: []const u16) !void {
    // Buffer
    {
        var wtf8_buf: [32]u8 = undefined;
        const wtf8_len = wtf16LeToWtf8(&wtf8_buf, wtf16le);
        const wtf8 = wtf8_buf[0..wtf8_len];

        var roundtripped_buf: [32]u16 = undefined;
        const roundtripped_len = try wtf8ToWtf16Le(&roundtripped_buf, wtf8);
        const roundtripped = roundtripped_buf[0..roundtripped_len];

        try testing.expectEqualSlices(u16, wtf16le, roundtripped);
    }
    // Alloc
    {
        const wtf8 = try wtf16LeToWtf8Alloc(testing.allocator, wtf16le);
        defer testing.allocator.free(wtf8);

        const roundtripped = try wtf8ToWtf16LeAlloc(testing.allocator, wtf8);
        defer testing.allocator.free(roundtripped);

        try testing.expectEqualSlices(u16, wtf16le, roundtripped);
    }
    // AllocZ
    {
        const wtf8 = try wtf16LeToWtf8AllocZ(testing.allocator, wtf16le);
        defer testing.allocator.free(wtf8);

        const roundtripped = try wtf8ToWtf16LeAllocZ(testing.allocator, wtf8);
        defer testing.allocator.free(roundtripped);

        try testing.expectEqualSlices(u16, wtf16le, roundtripped);
    }
}