test: add fuzz testing (#18)

package.json

@@ -17,7 +17,11 @@
 		"node": ">=16.20"
 	},
 	"scripts": {
-		"test": "c8 ava && tsd --files tests/**/*.test-d.ts",
+		"test": "c8 npm run test:all",
+		"test:all": "npm run test:ava && npm run test:fuzz && npm run test:tsd",
+		"test:ava": "ava tests/e2e.test.js",
+		"test:fuzz": "NODE_OPTIONS=--no-warnings ava tests/fuzz.test.js",
+		"test:tsd": "tsd --files tests/**/*.test-d.ts",
 		"lint": "xo",
 		"lint:fix": "xo --fix"
 	},
@@ -37,6 +41,7 @@
 		"path"
 	],
 	"devDependencies": {
+		"@fast-check/ava": "^1.1.6",
 		"@insurgentlab/conventional-changelog-preset": "7.0.0",
 		"@semantic-release/changelog": "6.0.3",
 		"@semantic-release/git": "10.0.1",

tests/fuzz.test.js

@@ -0,0 +1,27 @@
+// Hack while waiting for https://github.com/ossf/scorecard/issues/3567 to be resolved
+// eslint-disable-next-line no-unused-vars, import/order
+import _fc from 'fast-check';
+
+import { fc, testProp } from '@fast-check/ava';
+import importFrom from '../index.js';
+
+testProp(
+	'should return loaded module and not error unexpectedly', [fc.string(), fc.string()], async (t, a, b) => {
+		t.timeout(60_000);
+		let result;
+
+		try {
+			const loaded = await importFrom(a, b);
+			result = Boolean(loaded);
+			// If (result) {
+			// 	console.debug('successfully loaded', a, ' | ', b);
+			// 	console.debug(loaded);
+			// }
+		} catch (error) {
+			result = error.code === 'MODULE_NOT_FOUND';
+		}
+
+		t.true(result);
+	},
+	{ numRuns: 100_000 },
+);