bs-ospec

BuckleScript bindings for the excellent and minimal ospec testing library. Perfect for simple testing and constructing your own, custom assertions.

Installation

$ npm install --save-dev ospec bs-ospec

Then add "bs-ospec" to your bsconfig.json dev dependencies:

{
  ...
  "bs-dev-dependencies": [
    "bs-ospec"
  ]
}

Example Usage

First make sure your test files names are easily distinguishable. Here are some examples:

Format	Command to Run
Within a tests/ folder	ospec
Within a custom folder like spec/	ospec 'spec/**/*.bs.js'
Named MyModuleTest.re in any folder	ospec '**/*Test.bs.js'

Next, write your tests. Ospec uses a single function o() to do pretty much everything. However, OCaml doesn't support overloaded functions, so bs-ospec separates each use case into its own function (it all compiles to a single function in the end).

open BsOspec.Cjs;
 
describe("Example", () => {
 
  test("sync example", () => {
    f(x,y) |. equals(123);
    f(x,y) |. equals(~m="A descriptive failure message", 123);
    g(x,y) |. deepEquals(["another", "correct", "value"]);
  });
 
  testAsync("async example", done_ => {
    /* _ _  _  _  _   ___ _ _   _ _ __ __  __ _ _  __ _ */
    /* Note how we use testAsync() instead of test() !! */
    /*  ^^^ ^ ^ ^ ^^ ^ ^ ^ ^^ ^ ^ ^ ^ ^  ^^^ ^ ^^ ^^^ ^ */
    someFuture()
    |. Future.get(result => {
      result |. equals("expected");
      done_()
    })
  });
 
  testAsyncLong("longer async example", (done_, timeout) => {
    timeout(2000) /* ospec default is 50 milliseconds. */
 
    someLongFuture()
    |. Future.get(result => {
      result |. equals("expected");
      done_()
    })
  });
});

Lastly, run your test suite by running an ospec command like the table shown above.

ES Modules

BsOspec supports both CommonJS and ES Modules (ESM). BuckleScript is configured to use CommonJS by default; if you are using ESM, first configure your bsconfig.json to use es6-global:

{
  ...
  "package-specs": {
    "module": "es6-global",
    "in-source": true
  }
}

Then just write open BsOspec.Esm; instead of open BsOspec.Cjs; in your test files.

If you're interested in using ESM today, you can install the esm package and add --require esm to the end of your ospec command. For example:

ospec '**/*Test.bs.js' --require esm

Bindings

See the source for the full details.

Test Definitions:

• describe - Group a collection of tests. Not required.
• test - Define a synchronous test
• testAsync - Define an async test
• testAsyncLong - Define an async test expected to last longer than 50ms.
• testOnly, testAsyncOnly, testAsyncLongOnly - Define and only run this test. Useful for focusing on a single test.

Hooks:

• beforeEach, beforeEachAsync - Run code before each test
• afterEach, afterEachAsync - Run code after each test
• before, beforeAsync - Run code once before all tests
• after, afterAsync - Run code once after all tests

Assertions:

• equals(expected, ~m=?, actual) - Expect a value to equal another value. Optionally pass in ~m="my msg" to show a custom message if the assertion fails.
• deepEquals(expected, ~m=?, actual) - Expect a value to deep equal another value.
• notEquals(expected, ~m=?, actual)
• notDeepEquals(expected, ~m=?, actual)

Build

npm run build

Build + Watch

npm run start

Editor

If you use vscode, Press Windows + Shift + B it will build automatically