Speed up some more tests (#25892)

### What does this PR do?

### How did you verify your code works?

test/cli/install/bun-upgrade.test.ts

@@ -1,25 +1,20 @@
-import { spawn, spawnSync } from "bun";
+import { spawn } from "bun";
 import { upgrade_test_helpers } from "bun:internal-for-testing";
-import { beforeAll, beforeEach, expect, it, setDefaultTimeout } from "bun:test";
+import { beforeAll, describe, expect, it, setDefaultTimeout } from "bun:test";
 import { bunExe, bunEnv as env, tls, tmpdirSync } from "harness";
-import { copyFileSync } from "node:fs";
+import { copyFile } from "node:fs/promises";
 import { basename, join } from "path";
 const { openTempDirWithoutSharingDelete, closeTempDirHandle } = upgrade_test_helpers;
 
-let cwd: string;
-let execPath: string;
-
 beforeAll(() => {
   setDefaultTimeout(1000 * 60 * 5);
 });
 
-beforeEach(async () => {
-  cwd = tmpdirSync();
-  execPath = join(cwd, basename(bunExe()));
-  copyFileSync(bunExe(), execPath);
-});
-
+describe.concurrent(() => {
   it("two invalid arguments, should display error message and suggest command", async () => {
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
     const { stderr } = spawn({
       cmd: [execPath, "upgrade", "bun-types", "--dev"],
       cwd,
@@ -35,6 +30,9 @@ it("two invalid arguments, should display error message and suggest command", as
   });
 
   it("two invalid arguments flipped, should display error message and suggest command", async () => {
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
     const { stderr } = spawn({
       cmd: [execPath, "upgrade", "--dev", "bun-types"],
       cwd,
@@ -50,6 +48,9 @@ it("two invalid arguments flipped, should display error message and suggest comm
   });
 
   it("one invalid argument, should display error message and suggest command", async () => {
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
     const { stderr } = spawn({
       cmd: [execPath, "upgrade", "bun-types"],
       cwd,
@@ -65,6 +66,9 @@ it("one invalid argument, should display error message and suggest command", asy
   });
 
   it("one valid argument, should succeed", async () => {
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
     const { stderr } = spawn({
       cmd: [execPath, "upgrade", "--help"],
       cwd,
@@ -76,11 +80,16 @@ it("one valid argument, should succeed", async () => {
 
     const err = await stderr.text();
     // Should not contain error message
-  expect(err.split(/\r?\n/)).not.toContain("error: This command updates bun itself, and does not take package names.");
+    expect(err.split(/\r?\n/)).not.toContain(
+      "error: This command updates bun itself, and does not take package names.",
+    );
     expect(err.split(/\r?\n/)).not.toContain("note: Use `bun update --help` instead.");
   });
 
   it("two valid argument, should succeed", async () => {
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
     const { stderr } = spawn({
       cmd: [execPath, "upgrade", "--stable", "--profile"],
       cwd,
@@ -92,7 +101,9 @@ it("two valid argument, should succeed", async () => {
 
     const err = await stderr.text();
     // Should not contain error message
-  expect(err.split(/\r?\n/)).not.toContain("error: This command updates Bun itself, and does not take package names.");
+    expect(err.split(/\r?\n/)).not.toContain(
+      "error: This command updates Bun itself, and does not take package names.",
+    );
     expect(err.split(/\r?\n/)).not.toContain("note: Use `bun update --stable --profile` instead.");
   });
 
@@ -157,8 +168,11 @@ it("zero arguments, should succeed", async () => {
     // On windows, open the temporary directory without FILE_SHARE_DELETE before spawning
     // the upgrade process. This is to test for EBUSY errors
     openTempDirWithoutSharingDelete();
+    const cwd = tmpdirSync();
+    const execPath = join(cwd, basename(bunExe()));
+    await copyFile(bunExe(), execPath);
 
-  const { stderr } = spawnSync({
+    const { stderr } = Bun.spawn({
       cmd: [execPath, "upgrade"],
       cwd,
       stdout: null,
@@ -174,5 +188,6 @@ it("zero arguments, should succeed", async () => {
     closeTempDirHandle();
 
     // Should not contain error message
-  expect(stderr.toString()).not.toContain("error:");
+    expect(await stderr.text()).not.toContain("error:");
+  });
 });

test/harness.ts

@@ -811,6 +811,16 @@ export async function toBeWorkspaceLink(actual: string, expectedLinkPath: string
   return { pass, message };
 }
 
+export function getFDCount(): number {
+  if (isMacOS || isLinux) {
+    return fs.readdirSync(isMacOS ? "/dev/fd" : "/proc/self/fd").length;
+  }
+
+  const maxFD = openSync("/dev/null", "r");
+  closeSync(maxFD);
+  return maxFD;
+}
+
 export function getMaxFD(): number {
   if (isMacOS || isLinux) {
     let max = -1;

test/js/node/async_hooks/AsyncLocalStorage-tracking.test.ts

@@ -3,7 +3,7 @@ import { describe, test } from "bun:test";
 import { bunEnv, bunExe, isASAN, isBroken, isLinux, nodeExe } from "harness";
 import { basename, join } from "path";
 
-describe("AsyncLocalStorage passes context to callbacks", () => {
+describe.concurrent("AsyncLocalStorage passes context to callbacks", () => {
   let files = [...new Glob(join(import.meta.dir, "async-context", "async-context-*.js")).scanSync()];
 
   let todos = ["async-context-worker_threads-message.js"];