feat(test): basic tests for ESLint

src/public/app/services/eslint.spec.ts

@@ -0,0 +1,29 @@
+import { lint } from "./eslint.js";
+import { trimIndentation } from "../../../../spec/support/utils.js";
+import { describe, expect, it } from "vitest";
+
+describe("Linter", () => {
+    it("reports some basic errors", async () => {
+        const result = await lint(trimIndentation`
+            for (const i = 0; i<10; i++) {
+            }
+        `);
+        expect(result).toMatchObject([
+            { message: "'i' is constant.", },
+            { message: "Empty block statement." }
+        ]);
+    });
+
+    it("reports no error for correct script", async () => {
+        const result = await lint(trimIndentation`
+            const foo = "bar";
+            console.log(foo.toString());
+            for (const x of [ 1, 2, 3]) {
+                console.log(x?.toString());
+            }
+
+            api.showMessage("Hi");
+        `);
+        expect(result.length).toBe(0);
+    });
+});