From 65efd5de680058b1f93ddaeef7534c0ddc280810 Mon Sep 17 00:00:00 2001
From: alxkm <alexanderklmn@gmail.com>
Date: Wed, 16 Jul 2025 23:03:02 +0200
Subject: [PATCH 1/3] testing: improve test coverage DuplicateBracketsTest

---
 .../stacks/DuplicateBracketsTest.java         | 31 +++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
index e2cc6acb8112..ba7e60e00b21 100644
--- a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
+++ b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
@@ -4,20 +4,23 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.util.stream.Stream;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.CsvSource;
+import org.junit.jupiter.params.provider.MethodSource;
 
 class DuplicateBracketsTest {
 
     @ParameterizedTest
-    @CsvSource({"'((a + b) + (c + d))'", "'(a + b)'", "'a + b'", "'('", "''"})
+    @CsvSource({"'((a + b) + (c + d))'", "'(a + b)'", "'a + b'", "'('", "''", "'a + (b * c) - d'", "'(x + y) * (z)'", "'(a + (b - c))'"})
     void testInputReturnsFalse(String input) {
         assertFalse(DuplicateBrackets.check(input));
     }
 
     @ParameterizedTest
-    @CsvSource({"'(a + b) + ((c + d))'", "'((a + b))'", "'((((a + b)))))'"})
+    @CsvSource({"'(a + b) + ((c + d))'", "'((a + b))'", "'((((a + b)))))'", "'((x))'", "'((a + (b)))'", "'(a + ((b)))'", "'(((a)))'", "'(((())))'"})
     void testInputReturnsTrue(String input) {
         assertTrue(DuplicateBrackets.check(input));
     }
@@ -26,4 +29,28 @@ void testInputReturnsTrue(String input) {
     void testInvalidInput() {
         assertThrows(IllegalArgumentException.class, () -> DuplicateBrackets.check(null));
     }
+
+    @ParameterizedTest(name = "Should be true: \"{0}\"")
+    @MethodSource("provideInputsThatShouldReturnTrue")
+    void testDuplicateBracketsTrueCases(String input) {
+        assertTrue(DuplicateBrackets.check(input));
+    }
+
+    static Stream<Arguments> provideInputsThatShouldReturnTrue() {
+        return Stream.of(Arguments.of("()"), Arguments.of("(( ))"));
+    }
+
+    @ParameterizedTest(name = "Should be false: \"{0}\"")
+    @MethodSource("provideInputsThatShouldReturnFalse")
+    void testDuplicateBracketsFalseCases(String input) {
+        assertFalse(DuplicateBrackets.check(input));
+    }
+
+    static Stream<Arguments> provideInputsThatShouldReturnFalse() {
+        return Stream.of(
+                Arguments.of("( )"), // whitespace inside brackets
+                Arguments.of("abc + def"), // no brackets
+                Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
+        );
+    }
 }

From e7adb6d249a7f4ed490f0ecefb2f386bc97042d7 Mon Sep 17 00:00:00 2001
From: alxkm <alexanderklmn@gmail.com>
Date: Wed, 16 Jul 2025 23:05:38 +0200
Subject: [PATCH 2/3] style: fix formatting checkstyle

---
 .../java/com/thealgorithms/stacks/DuplicateBracketsTest.java   | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
index ba7e60e00b21..3508faf2f42b 100644
--- a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
+++ b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
@@ -47,8 +47,7 @@ void testDuplicateBracketsFalseCases(String input) {
     }
 
     static Stream<Arguments> provideInputsThatShouldReturnFalse() {
-        return Stream.of(
-                Arguments.of("( )"), // whitespace inside brackets
+        return Stream.of(Arguments.of("( )"), // whitespace inside brackets
                 Arguments.of("abc + def"), // no brackets
                 Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
         );

From 5aff75322784cc5de65f522af35dd9d95e84f92d Mon Sep 17 00:00:00 2001
From: alxkm <alexanderklmn@gmail.com>
Date: Wed, 16 Jul 2025 23:06:38 +0200
Subject: [PATCH 3/3] style: fix formatting checkstyle

---
 .../java/com/thealgorithms/stacks/DuplicateBracketsTest.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
index 3508faf2f42b..bc7b3266d98e 100644
--- a/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
+++ b/src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java
@@ -48,8 +48,8 @@ void testDuplicateBracketsFalseCases(String input) {
 
     static Stream<Arguments> provideInputsThatShouldReturnFalse() {
         return Stream.of(Arguments.of("( )"), // whitespace inside brackets
-                Arguments.of("abc + def"), // no brackets
-                Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
+            Arguments.of("abc + def"), // no brackets
+            Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
         );
     }
 }

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