diff --git a/src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java b/src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java
index 23d41b159fe2..411b11e743b8 100644
--- a/src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java
+++ b/src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java
@@ -1,15 +1,33 @@
package com.thealgorithms.strings;
import static org.junit.jupiter.api.Assertions.assertEquals;
+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;
public class ValidParenthesesTest {
@ParameterizedTest(name = "Input: \"{0}\" → Expected: {1}")
- @CsvSource({"'()', true", "'()[]{}', true", "'(]', false", "'{[]}', true", "'([{}])', true", "'([)]', false", "'', true", "'(', false", "')', false"})
- void testIsValid(String input, boolean expected) {
+ @CsvSource({"'()', true", "'()[]{}', true", "'(]', false", "'{[]}', true", "'([{}])', true", "'([)]', false", "'', true", "'(', false", "')', false", "'{{{{}}}}', true", "'[({})]', true", "'[(])', false", "'[', false", "']', false", "'()()()()', true", "'(()', false", "'())', false",
+ "'{[()()]()}', true"})
+ void
+ testIsValid(String input, boolean expected) {
assertEquals(expected, ValidParentheses.isValid(input));
}
+
+ @Test
+ void testNullInputThrows() {
+ IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () -> ValidParentheses.isValid(null));
+ assertEquals("Input string cannot be null", ex.getMessage());
+ }
+
+ @ParameterizedTest(name = "Input: \"{0}\" → throws IllegalArgumentException")
+ @CsvSource({"'a'", "'()a'", "'[123]'", "'{hello}'", "'( )'", "'\t'", "'\n'", "'@#$%'"})
+ void testInvalidCharactersThrow(String input) {
+ IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () -> ValidParentheses.isValid(input));
+ assertTrue(ex.getMessage().startsWith("Unexpected character"));
+ }
}
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