test: changes to use template literal

test: changes to use template literal · nodejs/node@1c1312e

Original file line number	Diff line number	Diff line change
`@@ -24,7 +24,7 @@ if (cluster.isMaster) {`
`24`	`24`	`}));`
`25`	`25`
`26`	`26`	`cluster.on('exit', common.mustCall(function(worker, code) {`
`27`		`-assert.strictEqual(code, 0, 'worker exited with error');`
	`27`	+assert.strictEqual(code, 0, `worker exited with error code ${code}`);
`28`	`28`	`}, 2));`
`29`	`29`
`30`	`30`	`return;`