toast v0.3.0

A small, no-dependency testing framework for Umka.



A small testing framework with no dependencies written in the Umka programming language.

  • Pretty simple; less than 300 sloc, easy to read and modify/extend
  • Carries timing information and keeps track of test results
  • Can print testing information in a slick and straightforward format, or a verbose but insightful one



Download the "" file and place it somewhere in your project. Then, import it in your test file.

Through UmBox

[!WARNING] This will install the master branch version of the box, which might not be stable.

Run umbox install toast. You can also run umbox init toast to make a new box with Umka and toast preinstalled.


Creating a new test suite

The simplest (and currently, only) way to create a test suite is to make a new Context, register one or more tests to it and then run it:

fn main() {
    T := toast::newContext()
        { name: "test 1", func: test1 },
        { name: "test 2", func: test2 }
    T.registerTest("test 3", test3)

Each test in the map passed to registerTests must have this signature:

type TestFn* = fn (T: ^Context)

Test functions

A sample test function goes like this:

import ""

fn sampleTest(T: ^toast::Context) {
    recipes := getRecipes()

    res := T.assert.isTrue(
        validkey(recipes, "specialDish"),
        "the path to the special dish isn't listed"

    if !res { return }

    f, e := std::fopen(recipes["specialDish"], "rb")
    if !T.assert.isOk(e) { return }

    // ... do stuff with file ...


You set up any needed modules and variables, and then call one of the methods in the .assert struct to check for any conditions. As of now, the result must be checked for a false value and the test returned from manually.

Custom assertions

You can also make custom assertion functions by, either mixing and matching assertions, or encoding your own logic with the help of the fail and pass functions.

For example, here's how an assertEqualTypes function could be written using custom logic for some specific interface T:

fn assertEqualTypes(T: ^toast::Context, a, b: T): bool {

    if !selftypeeq(a, b) {"expected a and b to have the same type")
        return T.endCustom(false)

    return T.endCustom(true)

It can then be used as any other test function:

// ...

// this will pass
if !assertEqualTypes(T, 1, 2) { return }
// this will fail
if !assertEqualTypes(T, 1, "aeiou") { return }

// ...

Here's also a pretty pointless equal values assertion implemented with the assert.isTrue call (for any two comparable types T and U):

fn assertEqual(T: ^toast::Context, a: T, b: U): bool {
    return T.endCustom(T.assert.isTrue(
        a == b, "expected a and b to be equal"


This library is licensed under the BSD 2-Clause license. See LICENSE for details.

Source code


License: BSD 2-Clause

Download count: 23

To add this package to your project run:

umbox install toast

Or download as a tar.


No dependencies

Last updated