| 1 | const std = @import("std"); |
| 2 | |
| 3 | test "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 | // However, in most cases it is more convenient to use a more specific function like `expectEqual`. |
| 12 | // This gives you much clearer and more helpful error messages when a test fails. |
| 13 | try std.testing.expectEqual(42, addOne(41)); |
| 14 | } |
| 15 | |
| 16 | test addOne { |
| 17 | // A test name can also be written using an identifier. |
| 18 | // This is a doctest, and serves as documentation for `addOne`. |
| 19 | try std.testing.expectEqual(42, addOne(41)); |
| 20 | } |
| 21 | |
| 22 | /// The function `addOne` adds one to the number given as its argument. |
| 23 | fn addOne(number: i32) i32 { |
| 24 | return number + 1; |
| 25 | } |
| 26 | |
| 27 | // test |