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testing: Enhance ValidParenthesesTest (#6398)

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* testing: improve test coverage ValidParenthesesTest

* style: fix formatting for checkstyle

* style: fix formatting for checkstyle

* style: fix import

---------

Co-authored-by: Deniz Altunkapan <93663085+DenizAltunkapan@users.noreply.github.com>
This commit is contained in:
Oleksandr Klymenko
2025-07-19 17:07:54 +03:00
committed by GitHub
parent 334543f54c
commit 0a46b828c2
1 changed files with 20 additions and 2 deletions
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22
src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java
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@@ -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"));
}
}