test_object_fromentries_iterables.cjs
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test_object_fromentries_iterables.cjs
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	const assert = require("node:assert");

	assert.deepStrictEqual(
	Object.fromEntries(new Map([
	["a", 1],
	["b", 2],
	])),
	{ a: 1, b: 2 },
	);

	function* pairGenerator() {
	yield ["x", 10];
	yield ["y", 20];
	}

	assert.deepStrictEqual(
	Object.fromEntries(pairGenerator()),
	{ x: 10, y: 20 },
	);

	const iterable = {
	[Symbol.iterator]: function* () {
	yield ["left", "right"];
	yield ["up", "down"];
	},
	};

	assert.deepStrictEqual(
	Object.fromEntries(iterable),
	{ left: "right", up: "down" },
	);

	class RequestContextLike {
	constructor() {
	this.registry = new Map();
	}

	set(key, value) {
	this.registry.set(key, value);
	}

	entries() {
	return this.registry.entries();
	}
	}

	const ctx = new RequestContextLike();
	ctx.set("harness", {
	state: { projectPath: "/tmp/project" },
	getState() {
	return this.state;
	},
	});

	const snapshot = Object.fromEntries(ctx.entries());
	assert.strictEqual(snapshot.harness.getState().projectPath, "/tmp/project");

	let invalidEntryError;
	try {
	Object.fromEntries((function* () { yield 1; })());
	} catch (error) {
	invalidEntryError = error;
	}

	assert.ok(invalidEntryError instanceof Error);
	assert.match(String(invalidEntryError), /requires an iterable\|entry object/);

	console.log("Object.fromEntries consumes Map iterators, generators, and custom iterables");

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