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Extensions

Atom-Mocha includes a few extras to help with writing specs:

These are always available unless noExtensions is set.

In addition, the following objects are made globally-accessible:

global.Mocha  = require("mocha");
global.Chai   = require("chai");
global.expect = Chai.expect;

.buffer

Asserts that subject is a TextBuffer instance. See also: .editor.

const editor = atom.workspace.getActiveTextEditor();
expect(editor.getBuffer()).to.be.a.buffer;
expect(editor).not.to.be.a.buffer;

class

Asserts that an HTML element's classList contains one or more CSS classes.

expect(div).to.have.class("error-msg");
expect(btn).to.have.classes(["icon", "btn"]);
expect(btn).to.have.classes("icon", "btn");
expect([btn1, btn2]).to.have.class("btn");
btn1.should.have.classes("icon btn");

Class names may be specified as an array of strings, or a whitespace-delimited string. The function is variadic: multiple arguments of either type may be passed at once.

Both class and classes are equivalent invocations; the pluralised form exists only for readability.

.drawn

Assert that an HTML element is being rendered in the DOM tree.

expect(New("div")).not.to.be.drawn;
expect(document.body).to.be.drawn;

Note that elements with opacity: 0 or visibility: hidden are still "drawn", because their dimensions affect the document's layout:

expect(New("div", {style: {opacity: 0}})).to.be.drawn;
expect(New("div", {style: {visibility: "hidden"}})).to.be.drawn;

The same is true of positioned elements which are offset outside the viewport:

#hidden-block{
	position: absolute;
	left: -9999px;
	top: -9999px;
}
expect(document.querySelector("#hidden-block")).to.be.drawn;

.editor

Asserts that subject is a TextEditor object. See also .buffer.

const editor = atom.workspace.getActiveTextEditor();
expect(editor).to.be.an.editor;
expect(editor.buffer).not.to.be.an.editor;

.equalPath

Asserts that two filesystem paths are equal.

expect("/foo/bar/..").to.equalPath("/foo");

.existOnDisk

Asserts that a given string matches an existing file or directory:

expect("/usr/local/").to.existOnDisk;
expect(__filename).to.existOnDisk;
"/usr/local/bin/atom".should.existOnDisk;
"/::<:N:O:P:E:>::*?/".should.not.existOnDisk;

.focus

Assert that an HTML element has user focus, or contains an element which does.

expect(treeView).to.have.focus;
expect(New("div")).not.to.have.focus;
document.activeElement.should.have.focus;

Added in v2.2.0: .focus now works on TextEditor objects, asserting that the editor is currently "active" in the user's workspace:

const editor = atom.workspace.getActiveTextEditor();
expect(editor).to.have.focus;         // true
expect(editor.element).to.have.focus; // false

Additionally, the assertion also works on "component-like" objects. That is, an object which doesn't inherit from HTMLElement, but contains an .element property that does.

For example, the tree-view package creates a singleton TreeView which references the physical DOM element in its .element property:

const {treeView} = atom.packages.getActivePackage("tree-view").mainModule;
expect(treeView).not.to.be.instanceOf(HTMLElement);
expect(treeView.element).to.be.instanceOf(HTMLElement);
await atom.commands.dispatch("atom-workspace", "tree-view:focus");
expect(treeView).to.have.focus; // true

attachToDOM()

Attach an HTML element to the spec-runner window.

const workspace = atom.views.getView(atom.workspace);
attachToDOM(workspace);

Fulfils the same duty as Atom's jasmine.attachToDOM extension.

resetDOM()

Remove unrecognised DOM elements from the spec-runner's body element. Complements attachToDOM().

afterEach(() => resetDOM());

WARNING:
This wipes any element that isn't body > #mocha. Avoid using this function if:

  • You have a custom reporter with different element IDs
  • Have programmatically added extra feedback elements using the js option (which sit outside the #mocha wrapper).

unlessOnWindows()

Predicate to skip POSIX-only tests. Mocha's .skip function flags a test as pending, implying temporary omission. For tests which are impossible to run on Windows, this feedback is rarely warranted or desired.

unlessOnWindows() allows tests to be silently skipped if run on Windows. No feedback is emitted, and no tests are marked pending. The whole block becomes invisible to the spec-runner:

unlessOnWindows.describe("Symlinks", …);
unlessOnWindows.it("tests hard-links", …);
unlessOnWindows.specify("More symlinks", …);

Arbitrary callbacks are also supported:

unlessOnWindows(function(){
	unixyStuff(…);
});

when()

Call Mocha's describe() with "When " prepended to its description:

when("colours are disabled", () =>
	it("shows an uncoloured icon", () => {
		…logic
	}));

Complements the autoIt setting, and helps specs read more naturally. Only globalised if when doesn't already exist on the global object.