Adds unit tests

1 files changed, 15 insertions, 0 deletions

diff --git a/tst/prepend.test.ts b/tst/prepend.test.ts
new file mode 100644
index 0000000..19a9b9a
--- /dev/null
+++ b/tst/prepend.test.ts
@@ -0,0 +1,15 @@
+import { prependWith } from '../lib/index';
+
+describe('leftpadesque/prepend', () => {
+    test('prepends between elements', () => {
+        expect(prependWith(['a', 'b'], '--')).toEqual(['--', 'a', '--', 'b']);
+    });
+
+    test('handles single element', () => {
+        expect(prependWith(['a'], '--')).toEqual(['--', 'a']);
+    });
+
+    test('handles empty input', () => {
+        expect(prependWith([], '--')).toEqual([]);
+    });
+});