test_array_is_template_object.cjs
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test_array_is_template_object.cjs
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	const assert = (cond, msg) => {
	if (!cond) throw new Error(msg);
	};

	let captured;
	function tag(strings) {
	captured = strings;
	return strings;
	}

	const first = tag`a${1}b`;
	const sameTextDifferentSite = tag`a${2}b`;

	function sameSite(value) {
	return tag`a${value}b`;
	}

	const sameSiteFirst = sameSite(1);
	const sameSiteSecond = sameSite(2);

	assert(typeof Array.isTemplateObject === "function", "Array.isTemplateObject should exist");
	assert(Array.isTemplateObject(first) === true, "tagged template strings array should be a template object");
	assert(Array.isTemplateObject(first.raw) === false, "raw array should not be a template object");
	assert(Array.isTemplateObject([]) === false, "ordinary array should not be a template object");
	assert(Array.isTemplateObject(Object.freeze(["a", "b"])) === false, "frozen ordinary array should not be a template object");
	assert(Array.isTemplateObject({ raw: ["a"] }) === false, "ordinary object should not be a template object");
	assert(Array.isTemplateObject("not an array") === false, "primitive should not be a template object");
	assert(Array.isTemplateObject() === false, "missing argument should return false");
	assert(first !== sameTextDifferentSite, "different template sites should not reuse the same object");
	assert(sameSiteFirst === sameSiteSecond, "same template site should reuse the same object");
	assert(captured === sameSiteSecond, "tag should receive cached template object");

	console.log("Array.isTemplateObject tests ok");

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