test: replacing assert message with template

test: replacing assert message with template · nodejs/node@f9cb428

Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@ const cluster = require('cluster');`
`8`	`8`
`9`	`9`	`if (cluster.isMaster) {`
`10`	`10`	`cluster.on('exit', (worker, code) => {`
`11`		`-assert.strictEqual(code, 0, 'worker exited with error');`
	`11`	+assert.strictEqual(code, 0, `worker exited with code: ${code}, expected 0`);
`12`	`12`	`});`
`13`	`13`
`14`	`14`	`return cluster.fork();`