Handle missing password input in password validator

Author: Richiealx

Sprint-3/4-stretch/password-validator.js

@@ -1,7 +1,12 @@
-// A small list of previous passwords that must not be reused.
+// A list of previously used passwords that cannot be reused.
 const previousPasswords = ["Password1!", "Welcome2#", "Strong3$"];
 
 function passwordValidator(password) {
+  // Ensure a password value is provided and that it is a string.
+  if (typeof password !== "string") {
+    return false;
+  }
+
   // Password must be at least 5 characters long.
   if (password.length < 5) {
     return false;

Sprint-3/4-stretch/password-validator.test.js

@@ -68,3 +68,15 @@ test("password is invalid when it has been used before", () => {
 
   expect(result).toEqual(false);
 });
+
+test("password is invalid when no password is provided", () => {
+  const result = isValidPassword();
+
+  expect(result).toEqual(false);
+});
+
+test("password is invalid when the value is not a string", () => {
+  const result = isValidPassword(12345);
+
+  expect(result).toEqual(false);
+});