chore(deps): update dependency fetch-mock to v12 (#470)

Author: renovate[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "@types/node": "^22.0.0",
     "@vitest/coverage-v8": "^2.0.3",
     "esbuild": "^0.24.0",
-    "fetch-mock": "^11.0.0",
+    "fetch-mock": "^12.0.0",
     "glob": "^11.0.0",
     "nock": "^14.0.0-beta.8",
     "prettier": "^3.2.4",

package.json

@@ -16,31 +16,32 @@ describe("Smoke tests", () => {
 
   it("userAgent option", () => {
     const mock = fetchMock
-      .sandbox()
-      .getOnce("https://api.github.com/", (_url, { headers }) => {
-        // @ts-ignore headers has wrong typing in fetch-mock 8.3.2
-        expect(headers["user-agent"]).toMatch(/^my-app\/1.2.3 /);
+      .createInstance()
+      .getOnce("https://api.github.com/", (_url) => {
+        expect(
+          mock.callHistory.calls()[0].options.headers!["user-agent"],
+        ).toMatch(/^my-app\/1.2.3 /);
 
         return { ok: true };
       });
 
     const octokit = new Octokit({
       userAgent: "my-app/1.2.3",
       request: {
-        fetch: mock,
+        fetch: mock.fetchHandler,
       },
     });
     return octokit.request("/");
   });
 
   it("@octokit/plugin-rest-endpoint-methods", () => {
     const mock = fetchMock
-      .sandbox()
+      .createInstance()
       .getOnce("path:/repos/octocat/hello-world", { ok: true });
 
     const octokit = new Octokit({
       request: {
-        fetch: mock,
+        fetch: mock.fetchHandler,
       },
     });
 
@@ -58,7 +59,7 @@ describe("Smoke tests", () => {
 
   it("@octokit/plugin-request-log", () => {
     const mock = fetchMock
-      .sandbox()
+      .createInstance()
       .getOnce("path:/", { status: 200, body: {} })
       .getOnce("path:/", { status: 404, body: {} }, { overwriteRoutes: false });
 
@@ -72,7 +73,7 @@ describe("Smoke tests", () => {
     const octokit = new Octokit({
       log: consoleStub,
       request: {
-        fetch: mock,
+        fetch: mock.fetchHandler,
       },
     });
 

test/integration/smoke.test.ts

@@ -9,7 +9,7 @@ describe("https://github.com/octokit/rest.js/issues/881", () => {
       "https://issue-881-codeload.github.com/octocat/Hello-World/legacy.tar.gz/master";
 
     const mock = fetchMock
-      .sandbox()
+      .createInstance()
       .headOnce(
         "https://api.github.com/repos/octocat/Hello-World/tarball/master",
         {
@@ -20,7 +20,7 @@ describe("https://github.com/octokit/rest.js/issues/881", () => {
 
     const octokit = new Octokit({
       request: {
-        fetch: mock,
+        fetch: mock.fetchHandler,
       },
     });