checkpoint: scripts detection of missing test companions

Author: bjacobgordon

vitest/ensure-all-units-have-test-companion.ts

@@ -0,0 +1,37 @@
+import {
+  toPath,
+} from '../@internal/File';
+
+import {
+  serialized,
+} from '../@internal/FilesystemPath';
+
+import {
+  TestableUnit,
+} from './TestableUnit';
+
+const unitsWithoutCompanions = TestableUnit.getAllThatAreMissingTestCompanion();
+
+if (unitsWithoutCompanions === null) {
+  console.error('Could not determine which units are missing test companions');
+  process.exit(1);
+}
+else if (
+  unitsWithoutCompanions.length === 0
+) process.exit(0);
+
+const pathFromCurrentModuleToProjectRoot = '../';
+
+const projectRoot = toPath(new URL(
+  pathFromCurrentModuleToProjectRoot,
+  import.meta.url,
+));
+
+const absolutePathToProjectRoot = serialized(projectRoot);
+
+const serializedUnitsWithoutCompanions = unitsWithoutCompanions
+  .map($0 => serialized($0).replace(absolutePathToProjectRoot, ''))
+  .join('\n');
+
+console.error(`The following ${unitsWithoutCompanions.length.toString()} unit(s) have no test companion:\n${serializedUnitsWithoutCompanions}`);
+process.exit(1);