diff --git a/test/cipher.spec.js b/test/cipher.spec.js
index 62b6818..308504d 100644
--- a/test/cipher.spec.js
+++ b/test/cipher.spec.js
@@ -54,10 +54,10 @@ describe('cipher', () => {
     });
 
     it('should throw TypeError when invoked with wrong argument types', () => {
-      expect(() => cipher.encode()).toThrow(TypeError);
-      expect(() => cipher.encode(0)).toThrow(TypeError);
-      expect(() => cipher.encode(null, [])).toThrow(TypeError);
-      expect(() => cipher.encode(0, 0)).toThrow(TypeError);
+      expect(() => cipher.decode()).toThrow(TypeError);
+      expect(() => cipher.decode(0)).toThrow(TypeError);
+      expect(() => cipher.decode(null, [])).toThrow(TypeError);
+      expect(() => cipher.decode(0, 0)).toThrow(TypeError);
     });
 
     it('should return "ABCDEFGHIJKLMNOPQRSTUVWXYZ" for "HIJKLMNOPQRSTUVWXYZABCDEFG" with offset 33', () => {