test(cli): clean up migration-show temp dirs in afterEach

Tests in migration-show.test.ts used createTempDir() to mkdir under tmpdir() but never removed the directories, leaving real state behind between runs (violating the CLI guideline that tests must clean up their own ephemeral directories). Track every returned dir in a module-level list and remove them in a suite-wide afterEach with rm({ recursive: true, force: true }) so cleanup runs even on failures.

Signed-off-by: Will Madden <madden@prisma.io>

Author: wmadden

packages/1-framework/3-tooling/cli/test/commands/migration-show.test.ts

@@ -1,4 +1,4 @@
-import { mkdir } from 'node:fs/promises';
+import { mkdir, rm } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { createContract, createSqlContract } from '@prisma-next/contract/testing';
@@ -17,7 +17,7 @@ import {
 import type { MigrationMetadata } from '@prisma-next/migration-tools/metadata';
 import type { OnDiskMigrationPackage } from '@prisma-next/migration-tools/package';
 import stripAnsi from 'strip-ansi';
-import { describe, expect, it } from 'vitest';
+import { afterEach, describe, expect, it } from 'vitest';
 import type { MigrationShowSpaceResult } from '../../src/commands/migration-show';
 import {
   resolveAppTargetPath,
@@ -27,15 +27,26 @@ import {
 import { formatMigrationShowOutput } from '../../src/utils/formatters/migrations';
 import { parseGlobalFlags } from '../../src/utils/global-flags';
 
+// Track every temp dir handed out by `createTempDir` so the suite-wide
+// `afterEach` can remove them — even when an assertion fails — keeping
+// ephemeral state out of the shared `tmpdir()` between runs.
+const createdTempDirs: string[] = [];
+
 async function createTempDir(prefix: string): Promise<string> {
   const dir = join(
     tmpdir(),
     `test-migration-show-${prefix}-${Date.now()}-${Math.random().toString(36).slice(2)}`,
   );
   await mkdir(dir, { recursive: true });
+  createdTempDirs.push(dir);
   return dir;
 }
 
+afterEach(async () => {
+  const dirs = createdTempDirs.splice(0);
+  await Promise.all(dirs.map((dir) => rm(dir, { recursive: true, force: true })));
+});
+
 function createOp(
   id: string,
   label: string,