added tests

Author: dschadow

crypto-hash/src/test/java/de/dominikschadow/javasecurity/hash/PasswordComparatorTest.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2026 Dominik Schadow, dominikschadow@gmail.com
+ *
+ * This file is part of the Java Security project.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package de.dominikschadow.javasecurity.hash;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PasswordComparatorTest {
+
+    @Test
+    void givenIdenticalHashesWhenComparingReturnsTrue() {
+        byte[] originalHash = {0x01, 0x02, 0x03, 0x04, 0x05};
+        byte[] comparisonHash = {0x01, 0x02, 0x03, 0x04, 0x05};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void givenDifferentHashesWhenComparingReturnsFalse() {
+        byte[] originalHash = {0x01, 0x02, 0x03, 0x04, 0x05};
+        byte[] comparisonHash = {0x01, 0x02, 0x03, 0x04, 0x06};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void givenDifferentLengthHashesWhenComparingReturnsFalse() {
+        byte[] originalHash = {0x01, 0x02, 0x03, 0x04, 0x05};
+        byte[] comparisonHash = {0x01, 0x02, 0x03};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void givenEmptyHashesWhenComparingReturnsTrue() {
+        byte[] originalHash = {};
+        byte[] comparisonHash = {};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void givenOneEmptyHashWhenComparingReturnsFalse() {
+        byte[] originalHash = {0x01, 0x02, 0x03};
+        byte[] comparisonHash = {};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void givenCompletelyDifferentHashesWhenComparingReturnsFalse() {
+        byte[] originalHash = {0x00, 0x00, 0x00, 0x00};
+        byte[] comparisonHash = {(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertFalse(result);
+    }
+
+    @Test
+    void givenSingleByteIdenticalHashesWhenComparingReturnsTrue() {
+        byte[] originalHash = {0x42};
+        byte[] comparisonHash = {0x42};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertTrue(result);
+    }
+
+    @Test
+    void givenSingleByteDifferentHashesWhenComparingReturnsFalse() {
+        byte[] originalHash = {0x42};
+        byte[] comparisonHash = {0x43};
+
+        boolean result = PasswordComparator.comparePasswords(originalHash, comparisonHash);
+
+        assertFalse(result);
+    }
+}