Initial taiko.su easter-egg site

tests/test_pageevents.js

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+const assert = require("node:assert/strict")
+const fs = require("node:fs")
+const path = require("node:path")
+const vm = require("node:vm")
+
+class EventTargetStub {
+	constructor() {
+		this.listeners = new Map()
+	}
+
+	addEventListener(type, callback) {
+		if (!this.listeners.has(type)) this.listeners.set(type, new Set())
+		this.listeners.get(type).add(callback)
+	}
+
+	removeEventListener(type, callback) {
+		if (this.listeners.has(type)) this.listeners.get(type).delete(callback)
+	}
+
+	dispatch(type, event) {
+		for (const callback of Array.from(this.listeners.get(type) || [])) callback(event)
+	}
+
+	listenerCount(type) {
+		return this.listeners.has(type) ? this.listeners.get(type).size : 0
+	}
+}
+
+const root = path.resolve(__dirname, "..")
+const source = fs.readFileSync(path.join(root, "public/src/js/pageevents.js"), "utf8")
+const window = new EventTargetStub()
+const context = vm.createContext({window, Map, Date})
+vm.runInContext(source + "; this.PageEvents = PageEvents", context)
+
+const pageEvents = new context.PageEvents()
+let keyboardCalls = 0
+let firstOverlayCalls = 0
+let secondOverlayCalls = 0
+
+pageEvents.keyAdd({}, "all", "both", () => keyboardCalls++)
+assert.equal(window.listenerCount("keydown"), 1)
+
+pageEvents.add(window, "keydown", () => firstOverlayCalls++, "library-escape")
+assert.equal(window.listenerCount("keydown"), 2, "a named overlay listener must not replace the global keyboard dispatcher")
+
+const keydown = {
+	key: "d",
+	keyCode: 68,
+	type: "keydown",
+	target: {tagName: "DIV"},
+	ctrlKey: false,
+	preventDefault() {}
+}
+window.dispatch("keydown", keydown)
+assert.equal(keyboardCalls, 1)
+assert.equal(firstOverlayCalls, 1)
+
+pageEvents.add(window, "keydown", () => secondOverlayCalls++, "library-escape")
+assert.equal(window.listenerCount("keydown"), 2, "replacing a named listener must not create duplicates")
+window.dispatch("keydown", keydown)
+assert.equal(keyboardCalls, 2)
+assert.equal(firstOverlayCalls, 1)
+assert.equal(secondOverlayCalls, 1)
+
+pageEvents.remove(window, "keydown", "library-escape")
+assert.equal(window.listenerCount("keydown"), 1)
+window.dispatch("keydown", keydown)
+assert.equal(keyboardCalls, 3, "removing an overlay listener must leave keyboard input active")
+
+let keyupCalls = 0
+pageEvents.keyAdd({}, "all", "up", () => keyupCalls++)
+window.dispatch("keyup", {...keydown, type: "keyup"})
+assert.equal(keyupCalls, 1)
+
+console.log("page event listener isolation ok")