diff --git a/10_fibonacci/fibonacci.spec.js b/10_fibonacci/fibonacci.spec.js
index 7f62213..7617791 100644
--- a/10_fibonacci/fibonacci.spec.js
+++ b/10_fibonacci/fibonacci.spec.js
@@ -16,9 +16,15 @@ describe('fibonacci', () => {
   test.skip('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
+  test('0th fibonacci number is o', () => {
+    expect(fibonacci(0)).toBe(0);
+  });
   test.skip('doesn\'t accept negatives', () => {
     expect(fibonacci(-25)).toBe("OOPS");
   });
+  test.skip('DOES accept strings', () => {
+    expect(fibonacci("0")).toBe(0);
+  });
   test.skip('DOES accept strings', () => {
     expect(fibonacci("1")).toBe(1);
   });