Use positional check instead of directory blocklist

Check that tests/ or test/ is within the first 2 path segments
(top-level or under a project name prefix) rather than hardcoding
app/addon exclusions.

Author: johanrd

lib/rules/no-test-import-export.js

@@ -70,10 +70,11 @@ module.exports = {
 
 function isInTestDirectory(filename) {
   const filenameParts = path.normalize(filename).split(path.sep);
-  // Must contain a tests/ or test/ segment, and must not be under app/ or addon/
-  const hasTestDir = filenameParts.includes('tests') || filenameParts.includes('test');
-  const isAppCode = filenameParts.includes('app') || filenameParts.includes('addon');
-  return hasTestDir && !isAppCode;
+  const testDirIndex = filenameParts.findIndex((part) => part === 'tests' || part === 'test');
+  // tests/ or test/ must be a top-level directory (index 0) or directly under
+  // a project name (index 1, e.g. my-app/tests/). Deeper nesting like
+  // app/components/tests/ is not a real test directory.
+  return testDirIndex >= 0 && testDirIndex <= 1;
 }
 
 function isTestHelperFilename(filename) {