From 5341ff8d16ff222e85d71257a3769c972101edbf Mon Sep 17 00:00:00 2001
From: Mohammad Abdul Aziz <m.a.aziz1900@gmail.com>
Date: Tue, 7 Jul 2026 14:58:46 +0200
Subject: [PATCH] add special character validation

---
 src/main/java/PasswordValidator.java     | 15 +++++++++++++++
 src/test/java/PasswordValidatorTest.java | 21 +++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/src/main/java/PasswordValidator.java b/src/main/java/PasswordValidator.java
index 2b51ed6..1bf70d0 100644
--- a/src/main/java/PasswordValidator.java
+++ b/src/main/java/PasswordValidator.java
@@ -81,4 +81,19 @@ public static boolean isValid(String password) {
 
         return true;
     }
+
+    public static boolean containsSpecialChar(String password, String allowed) {
+
+        if (password == null) {
+            return false;
+        }
+
+        for (char c : password.toCharArray()) {
+            if (allowed.indexOf(c) != -1) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }
\ No newline at end of file
diff --git a/src/test/java/PasswordValidatorTest.java b/src/test/java/PasswordValidatorTest.java
index a658c2a..ec3cbea 100644
--- a/src/test/java/PasswordValidatorTest.java
+++ b/src/test/java/PasswordValidatorTest.java
@@ -143,4 +143,25 @@ void isValidShouldReturnFalseWhenPasswordIsNull() {
         assertFalse(PasswordValidator.isValid(null));
     }
 
+    // special char test cases
+    @Test
+    void containsSpecialCharShouldReturnTrueWhenPasswordContainsExclamation() {
+        assertTrue(PasswordValidator.containsSpecialChar("Password1!", "!@#$%^&*()-_+=?.,;:"));
+    }
+
+    @Test
+    void containsSpecialCharShouldReturnTrueWhenPasswordContainsAtSign() {
+        assertTrue(PasswordValidator.containsSpecialChar("Password1@", "!@#$%^&*()-_+=?.,;:"));
+    }
+
+    @Test
+    void containsSpecialCharShouldReturnFalseWhenPasswordHasNoSpecialCharacter() {
+        assertFalse(PasswordValidator.containsSpecialChar("Password1", "!@#$%^&*()-_+=?.,;:"));
+    }
+
+    @Test
+    void containsSpecialCharShouldReturnFalseWhenPasswordIsNull() {
+        assertFalse(PasswordValidator.containsSpecialChar(null, "!@#$%^&*()-_+=?.,;:"));
+    }
+
 }
\ No newline at end of file