implement check for minimum password length

src/main/java/PasswordValidator.java

@@ -1,6 +1,7 @@
 public class PasswordValidator {
+    int minLength = 6;
 
     public boolean validate(String password) {
-        return false;
+        return password.length() >= minLength;
     }
 }

src/test/java/PasswordValidatorTest.java

@@ -8,5 +8,8 @@ class PasswordValidatorTest {
     void validate() {
         PasswordValidator passwordValidator = new PasswordValidator();
         assertFalse(passwordValidator.validate(""));
+
+        // test minimum password length
+        assertTrue(passwordValidator.validate("abcdef"));
     }
-}
+}