test: expand npm install and update check coverage

src/infra/update-check.test.ts

@@ -1,5 +1,11 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import { compareSemverStrings, resolveNpmChannelTag } from "./update-check.js";
+import {
+  compareSemverStrings,
+  fetchNpmLatestVersion,
+  fetchNpmTagVersion,
+  formatGitInstallLabel,
+  resolveNpmChannelTag,
+} from "./update-check.js";
 
 describe("compareSemverStrings", () => {
   it("handles stable and prerelease precedence for both legacy and beta formats", () => {
@@ -72,4 +78,81 @@ describe("resolveNpmChannelTag", () => {
 
     expect(resolved).toEqual({ tag: "latest", version: "1.0.1" });
   });
+
+  it("keeps non-beta channels unchanged", async () => {
+    versionByTag.latest = "1.0.3";
+
+    await expect(resolveNpmChannelTag({ channel: "stable", timeoutMs: 1000 })).resolves.toEqual({
+      tag: "latest",
+      version: "1.0.3",
+    });
+  });
+
+  it("exposes tag fetch helpers for success and http failures", async () => {
+    versionByTag.latest = "1.0.4";
+
+    await expect(fetchNpmTagVersion({ tag: "latest", timeoutMs: 1000 })).resolves.toEqual({
+      tag: "latest",
+      version: "1.0.4",
+    });
+    await expect(fetchNpmLatestVersion({ timeoutMs: 1000 })).resolves.toEqual({
+      latestVersion: "1.0.4",
+      error: undefined,
+    });
+    await expect(fetchNpmTagVersion({ tag: "beta", timeoutMs: 1000 })).resolves.toEqual({
+      tag: "beta",
+      version: null,
+      error: "HTTP 404",
+    });
+  });
+});
+
+describe("formatGitInstallLabel", () => {
+  it("formats branch, detached tag, and non-git installs", () => {
+    expect(
+      formatGitInstallLabel({
+        root: "/repo",
+        installKind: "git",
+        packageManager: "pnpm",
+        git: {
+          root: "/repo",
+          sha: "1234567890abcdef",
+          tag: null,
+          branch: "main",
+          upstream: "origin/main",
+          dirty: false,
+          ahead: 0,
+          behind: 0,
+          fetchOk: true,
+        },
+      }),
+    ).toBe("main · @ 12345678");
+
+    expect(
+      formatGitInstallLabel({
+        root: "/repo",
+        installKind: "git",
+        packageManager: "pnpm",
+        git: {
+          root: "/repo",
+          sha: "abcdef1234567890",
+          tag: "v1.2.3",
+          branch: "HEAD",
+          upstream: null,
+          dirty: false,
+          ahead: 0,
+          behind: 0,
+          fetchOk: null,
+        },
+      }),
+    ).toBe("detached · tag v1.2.3 · @ abcdef12");
+
+    expect(
+      formatGitInstallLabel({
+        root: null,
+        installKind: "package",
+        packageManager: "pnpm",
+      }),
+    ).toBeNull();
+  });
 });