feat: prepare 2.6.1-rc5 shared databases and build SSE

tests/lib/version-update-process.test.ts

@@ -0,0 +1,51 @@
+import { expect, test } from "bun:test";
+
+test("a short CLI exits while its version updater remains pending", async () => {
+  const moduleUrl = new URL("../../lib/version-update.ts", import.meta.url)
+    .href;
+  const script = `
+    const { createVersionObserver } = await import(${JSON.stringify(moduleUrl)});
+    createVersionObserver({
+      currentVersion: "2.6.1-rc3",
+      runner: () => new Promise(() => {}),
+    })("2.7.0");
+  `;
+  const child = Bun.spawn([process.execPath, "-e", script], {
+    stdin: "ignore",
+    stdout: "pipe",
+    stderr: "pipe",
+  });
+  const exit = await Promise.race([
+    child.exited,
+    new Promise<never>((_, reject) =>
+      setTimeout(() => reject(new Error("short CLI stayed alive")), 1_000),
+    ),
+  ]);
+
+  expect(exit).toBe(0);
+  expect(await new Response(child.stderr).text()).toBe("");
+});
+
+test.each([
+  ["success", "return true", "+ Updated to 2.7.0"],
+  ["failure", "throw new Error('install failed')", "+ New version available: 2.7.0"],
+])("reports exactly one %s outcome when it settles", async (_name, outcome, message) => {
+  const moduleUrl = new URL("../../lib/version-update.ts", import.meta.url).href;
+  const script = `
+    const { createVersionObserver } = await import(${JSON.stringify(moduleUrl)});
+    createVersionObserver({
+      currentVersion: "2.6.1-rc3",
+      runner: async () => { ${outcome}; },
+    })("2.7.0");
+    await new Promise((resolve) => setTimeout(resolve, 25));
+  `;
+  const child = Bun.spawn([process.execPath, "-e", script], {
+    stdin: "ignore",
+    stdout: "pipe",
+    stderr: "pipe",
+  });
+
+  expect(await child.exited).toBe(0);
+  const stderr = await new Response(child.stderr).text();
+  expect(stderr.split("\n").filter((line) => line.includes(message))).toHaveLength(1);
+});