Add e2e test using real filesystem

eng/tools/eslint-plugin-tsv/test/e2e-realfs.test.ts

@@ -0,0 +1,17 @@
+import { join, resolve } from "path";
+import { describe, expect, it } from "vitest";
+import { createESLint } from "./utils/e2e.js";
+
+const specsFolder = resolve(__filename, "../../../../../specification");
+
+describe("e2e-realfs", () => {
+  it("contosowidgetmanager/Contso.WidgetManager", async () => {
+    const eslint = createESLint();
+    const filePath = join(specsFolder, "contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml");
+    const results = await eslint.lintFiles(filePath);
+
+    expect(results).toHaveLength(1);
+    expect(results[0].filePath).toBe(filePath);
+    expect(results[0].messages).toHaveLength(0);
+  });
+});

eng/tools/eslint-plugin-tsv/test/utils/e2e.ts

@@ -0,0 +1,10 @@
+import { ESLint } from "eslint";
+import eslintPluginTsv from "../../src/eslint-plugin-tsv.js";
+
+export function createESLint() {
+  return new ESLint({
+    cwd: "/",
+    overrideConfig: eslintPluginTsv.configs.recommended,
+    overrideConfigFile: true,
+  });
+}