@joist/di/target/lib/dom/dom-injector.test.js

Dependency Injection for Vanilla JS classes

import { assert } from "chai";
import { INJECTOR_CTX } from "../context/injector.js";
import { ContextRequestEvent, } from "../context/protocol.js";
import { Injector } from "../injector.js";
import { DOMInjector } from "./dom-injector.js";
it("should respond to elements looking for an injector", () => {
    const injector = new DOMInjector();
    injector.attach(document.body);
    const host = document.createElement("div");
    document.body.append(host);
    let parent = null;
    host.dispatchEvent(new ContextRequestEvent(INJECTOR_CTX, (i) => {
        parent = i;
    }));
    assert.equal(parent, injector);
    injector.detach();
    host.remove();
});
it("should send request looking for other injector contexts", () => {
    const parent = new Injector();
    const injector = new DOMInjector();
    const cb = (e) => {
        if (e.context === INJECTOR_CTX) {
            e.callback(parent);
        }
    };
    document.body.addEventListener("context-request", cb);
    injector.attach(document.body);
    assert.equal(injector.parent, parent);
    injector.detach();
    document.body.removeEventListener("context-request", cb);
});
it("should throw an error if attempting to attach an already attached DOMInjector", () => {
    const injector = new DOMInjector();
    const el = document.createElement("div");
    injector.attach(el);
    assert.throw(() => {
        injector.attach(el);
    });
});
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