test: copy test apps to a temporary directory instead of an ignored p…

…roject subdirectory (#1404)

.eslintignore

@@ -1,4 +1,3 @@
-_tmp_*
 dist
 frameworks/react/preview/types
 frameworks/vue2/preview/modules

.gitignore

@@ -14,6 +14,5 @@ pro
 yarn-debug.log
 yarn-error.log
 __failures__
-_tmp_*
 *_screenshot_*.png
 !*_screenshot_linux.png

pnpm-workspace.yaml

@@ -11,7 +11,6 @@ packages:
   - "frameworks/*"
   - "frameworks/*/preview"
   - "frameworks/*/tests/apps/*"
-  - "!frameworks/*/tests/apps/_tmp_*"
   - "iframe"
   - "integrations/cli"
   - "integrations/intellij/daemon"

testing/src/test-dir.ts

@@ -1,3 +1,4 @@
+import { realpathSync } from "fs";
 import {
   copyFileSync,
   lstatSync,
@@ -10,15 +11,23 @@ import {
   symlinkSync,
   unlinkSync,
 } from "fs-extra";
+import os from "os";
 import path from "path";
 
 export function duplicateProjectForTesting(testProjectDirPath: string) {
-  const rootDirPath = path.join(
-    testProjectDirPath,
-    "..",
-    "_tmp_",
+  const tmpDir = realpathSync(os.tmpdir());
+  let rootDirPath = path.join(
+    tmpDir,
     `${path.basename(testProjectDirPath)}-${process.pid}`
   );
+  // TODO: Remove this hack because Windows tests fail in CI
+  // presumably because of different drives.
+  if (rootDirPath.startsWith("C:\\Users\\RUNNER~")) {
+    rootDirPath = rootDirPath.replace(
+      /C:\\Users\\RUNNER~\d+/g,
+      "D:\\a\\previewjs"
+    );
+  }
   mkdirpSync(rootDirPath);
   sync(testProjectDirPath, rootDirPath);
   return rootDirPath;