General source code refactoring

tests/consumerTokenSessionRetry.test.cjs

@@ -1,9 +1,7 @@
 const assert = require("node:assert/strict");
-const fs = require("node:fs");
-const path = require("node:path");
 const vm = require("node:vm");
+const { composeScript } = require("./support/application.cjs");
 
-const root = path.resolve(__dirname, "..");
 
 function createResponse(body, contentType) {
   return {
@@ -24,7 +22,7 @@ function createResponse(body, contentType) {
 
 function loadBackground(responses, createdTabs, removedTabs, options = {}) {
   let listener;
-  const source = fs.readFileSync(path.join(root, "src", "background.js"), "utf8");
+  const source = composeScript("background");
   const context = {
     chrome: {
       runtime: {