feat: add util to run-and-get watch proc

Author: hemal7735

test/testUtils.js

@@ -59,6 +59,20 @@ function runWatch(testCase, args = []) {
 	});
 }
 
+function runAndGetWatchProc(testCase, args = []) {
+	const cwd = path.resolve(testCase);
+
+	const outputPath = path.resolve(testCase, "bin");
+	const argsWithOutput = args.concat("--output-path", outputPath);
+
+	const webpackProc = execa(WEBPACK_PATH, argsWithOutput, {
+		cwd,
+		reject: false
+	});
+
+	return webpackProc;
+}
+
 function extractSummary(stdout) {
 	if (stdout === "") {
 		return "";
@@ -167,4 +181,4 @@ function appendDataIfFileExists(testCase, file, data) {
 	}
 }
 
-module.exports = { run, runWatch, extractHash, extractSummary, appendDataIfFileExists };
+module.exports = { run, runWatch, runAndGetWatchProc, extractHash, extractSummary, appendDataIfFileExists };