1const expect = @import("std").testing.expect;
 2
 3fn fibonacci(index: u32) u32 {
 4    if (index < 2) return index;
 5    return fibonacci(index - 1) + fibonacci(index - 2);
 6}
 7
 8test "fibonacci" {
 9    // test fibonacci at run-time
10    try expect(fibonacci(7) == 13);
11
12    // test fibonacci at compile-time
13    try comptime expect(fibonacci(7) == 13);
14}
15
16// test