Testing

Tests use the std:test module and run with pleno test or plm test.

pleno

import { describe, test, assert } from "std:test";

fn slugify(title: String): String {
    return title.toLowerCase().replace(" ", "-");
}

describe("slugify", fn() {
    test("lowercases and joins words", fn() {
        assert.equal(slugify("Hello World"), "hello-world");
    });

    test("keeps a single word", fn() {
        assert.equal(slugify("Pleno"), "pleno");
    });
});

Run

pleno test tests/        # every .pln file in tests/
plm test                 # the tests/ folder of the current project

Each file passes if all its tests pass and it runs without an error. A failing test is reported with its message, the other tests still run, and the command exits with a non-zero code, so CI notices.

Files that declare module Name; are libraries for other files and are skipped.

Assertions

Assertion	Passes when
`assert.equal(a, b)`	`a` and `b` are equal, comparing arrays and maps by content
`assert.notEqual(a, b)`	they are not equal
`assert.true(value)`, `assert.false(value)`	`value` is `true` or `false`
`assert.null(value)`, `assert.notNull(value)`	`value` is or is not `null`
`assert.throws(fn)`	calling `fn` throws
`assert.contains(collection, item)`	the array, string or map contains `item`
`assert.lengthOf(collection, n)`	it has `n` elements

beforeEach and afterEach run a function around every test in a describe block. The std:test reference has the details.

Testing ​

Assertions ​

Testing

Assertions