Added a badge to display the monthly ramp

tests/buildOutput.test.cjs

@@ -0,0 +1,47 @@
+const assert = require("node:assert/strict");
+const { test } = require("node:test");
+const fs = require("node:fs/promises");
+const os = require("node:os");
+const path = require("node:path");
+const vm = require("node:vm");
+const { writeOutput } = require("../scripts/write-output.cjs");
+
+test("build output keeps the previous script available until complete replacement", async t => {
+  const folder = await fs.mkdtemp(path.join(os.tmpdir(), "opportunities-build-"));
+  t.after(() => fs.rm(folder, { recursive: true, force: true }));
+  const file = path.join(folder, "background.js");
+  await writeOutput(file, "old script");
+  await writeOutput(file, "new script", { ...fs, async rename(from, to) {
+    assert.equal(await fs.readFile(to, "utf8"), "old script");
+    assert.equal(await fs.readFile(from, "utf8"), "new script");
+    return fs.rename(from, to);
+  } });
+  assert.equal(await fs.readFile(file, "utf8"), "new script");
+  await writeOutput(file, "new script", { ...fs, writeFile() { assert.fail("Unchanged scripts must not be rewritten"); } });
+  for (const operation of ["writeFile", "rename"]) {
+    await assert.rejects(writeOutput(file, "failed update", { ...fs, async [operation]() {
+      throw new Error("Synthetic publication failure");
+    } }), /Synthetic publication failure/);
+    assert.equal(await fs.readFile(file, "utf8"), "new script");
+    assert.deepEqual(await fs.readdir(folder), ["background.js"]);
+  }
+});
+
+test("packaged background scripts start and register listeners without DOM or network", async () => {
+  for (const target of ["chromium", "firefox"]) {
+    const folder = path.join(__dirname, "../dist", target);
+    const manifest = JSON.parse(await fs.readFile(path.join(folder, "manifest.json"), "utf8"));
+    const files = manifest.background.scripts || [manifest.background.service_worker];
+    const listeners = [];
+    const api = { runtime: { onMessage: { addListener: handler => listeners.push(handler) } } };
+    const context = vm.createContext({ [target === "firefox" ? "browser" : "chrome"]: api,
+      setTimeout, fetch() { assert.fail("No startup network requests"); } });
+    for (const file of files) {
+      new vm.Script(await fs.readFile(path.join(folder, file), "utf8"), { filename: file }).runInContext(context);
+    }
+    assert.equal(listeners.length, 1, target);
+    for (const entry of manifest.content_scripts) {
+      for (const file of entry.js) new vm.Script(await fs.readFile(path.join(folder, file), "utf8"));
+    }
+  }
+});