test: integration tests (#40)

Co-authored-by: Gregor Martynus <39992+gr2m@users.noreply.github.com>

tests/index.js

@@ -0,0 +1,14 @@
+import { readdirSync } from "node:fs";
+
+import { execa } from "execa";
+import test from "ava";
+
+const tests = readdirSync("tests").filter((file) => file.endsWith(".test.js"));
+
+for (const file of tests) {
+  test(file, async (t) => {
+    const { stderr, stdout } = await execa("node", [`tests/${file}`]);
+    t.snapshot(stderr, "stderr");
+    t.snapshot(stdout, "stdout");
+  });
+}