1const std = @import("std");
 2
 3test "expect addOne adds one to 41" {
 4
 5    // The Standard Library contains useful functions to help create tests.
 6    // `expect` is a function that verifies its argument is true.
 7    // It will return an error if its argument is false to indicate a failure.
 8    // `try` is used to return an error to the test runner to notify it that the test failed.
 9    try std.testing.expect(addOne(41) == 42);
10}
11
12test addOne {
13    // A test name can also be written using an identifier.
14    // This is a doctest, and serves as documentation for `addOne`.
15    try std.testing.expect(addOne(41) == 42);
16}
17
18/// The function `addOne` adds one to the number given as its argument.
19fn addOne(number: i32) i32 {
20    return number + 1;
21}
22
23// test