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node_modules/util.promisify/test/tests.js

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+'use strict';
+
+var hasSymbols = require('has-symbols')();
+
+module.exports = function runTests(promisify, t) {
+	t.equal(typeof promisify, 'function', 'promisify is a function');
+
+	t['throws'](
+		function () { promisify(null); },
+		TypeError,
+		'throws on non-functions'
+	);
+
+	var yes = function () {
+		var cb = arguments[arguments.length - 1];
+		cb(null, Array.prototype.slice.call(arguments, 0, -1));
+	};
+	var no = function () {
+		var cb = arguments[arguments.length - 1];
+		cb(Array.prototype.slice.call(arguments, 0, -1));
+	};
+
+	var pYes = promisify(yes);
+	var pNo = promisify(no);
+
+	t.equal(typeof pYes, 'function', 'pYes is a function');
+	t.equal(typeof pNo, 'function', 'pNo is a function');
+
+	t.test('pYes is properly promisified', { skip: typeof Promise !== 'function' }, function (st) {
+		st.plan(1);
+
+		var p = pYes(1, 2, 3);
+		return p.then(function (result) {
+			st.deepEqual(result, [1, 2, 3], 'fulfillment: arguments are preserved');
+		});
+	});
+
+	t.test('pNo is properly promisified', { skip: typeof Promise !== 'function' }, function (st) {
+		st.plan(1);
+
+		var p = pNo(1, 2, 3);
+		return p.then(null, function (args) {
+			st.deepEqual(args, [1, 2, 3], 'rejection: arguments are preserved');
+		});
+	});
+
+	t.test('custom symbol', { skip: !hasSymbols }, function (st) {
+		st.equal(Symbol.keyFor(promisify.custom), 'nodejs.util.promisify.custom', 'is a global symbol with the right key');
+		// eslint-disable-next-line no-restricted-properties
+		st.equal(Symbol['for']('nodejs.util.promisify.custom'), promisify.custom, 'is the global symbol');
+
+		st.end();
+	});
+};