add test to ensure separation of concerns

Author: lstreckeisen

test/archunit/SeparationOfConcerns.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, test } from 'vitest'
+import { filesOfProject } from 'tsarch'
+import fs from 'node:fs'
+import path from 'node:path'
+
+describe('Ensure separation of concerns', () => {
+  test('check language-internal dependencies', async () => {
+    const langFolders = fs.readdirSync(path.join(__dirname, '..', '..', 'src', 'language'), { withFileTypes: true })
+      .filter(file => file.isDirectory() && file.name !== 'generated')
+      .map(file => path.join('language', file.name))
+
+    for (const sourceFolder of langFolders) {
+      const ruleBuilder = filesOfProject()
+        .inFolder(sourceFolder)
+        .shouldNot()
+        .dependOnFiles()
+
+
+      for (const objectFolder of langFolders.filter(folder => folder !== sourceFolder)) {
+        const rule = ruleBuilder.inFolder(objectFolder)
+
+        const violations = await rule.check()
+        expect(violations, `expect ${sourceFolder} not to depend on ${objectFolder}`).toHaveLength(0)
+      }
+    }
+  })
+})