refactor: DuplicateBrackets (#5424)

refactor: DuplicateBrackets

Co-authored-by: alxkm <alx@alx.com>

src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java

@@ -0,0 +1,29 @@
+package com.thealgorithms.stacks;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class DuplicateBracketsTest {
+
+    @ParameterizedTest
+    @CsvSource({"'((a + b) + (c + d))'", "'(a + b)'", "'a + b'", "'('", "''"})
+    void testInputReturnsFalse(String input) {
+        assertFalse(DuplicateBrackets.check(input));
+    }
+
+    @ParameterizedTest
+    @CsvSource({"'(a + b) + ((c + d))'", "'((a + b))'", "'((((a + b)))))'"})
+    void testInputReturnsTrue(String input) {
+        assertTrue(DuplicateBrackets.check(input));
+    }
+
+    @Test
+    void testInvalidInput() {
+        assertThrows(IllegalArgumentException.class, () -> DuplicateBrackets.check(null));
+    }
+}