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testing: improving PostfixEvaluatorTest (#6405)

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* testing: improving PostfixEvaluatorTest

* testing: redundant cases
This commit is contained in:
Oleksandr Klymenko
2025-07-21 17:55:07 +02:00
committed by GitHub
parent 31bf130e9e
commit 0e9be57ed4
1 changed files with 24 additions and 7 deletions
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31
src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java
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@@ -4,24 +4,41 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.EmptyStackException;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;
public class PostfixEvaluatorTest {
@Test
public void testValidExpressions() {
assertEquals(22, PostfixEvaluator.evaluatePostfix("5 6 + 2 *"));
assertEquals(27, PostfixEvaluator.evaluatePostfix("7 2 + 3 *"));
assertEquals(3, PostfixEvaluator.evaluatePostfix("10 5 / 1 +"));
@ParameterizedTest(name = "Expression: \"{0}\" → Result: {1}")
@CsvSource({"'5 6 + 2 *', 22", "'7 2 + 3 *', 27", "'10 5 / 1 +', 3", "'8', 8", "'3 4 +', 7"})
@DisplayName("Valid postfix expressions")
void testValidExpressions(String expression, int expected) {
assertEquals(expected, PostfixEvaluator.evaluatePostfix(expression));
}
@Test
public void testInvalidExpression() {
@DisplayName("Should throw EmptyStackException for incomplete expression")
void testInvalidExpression() {
assertThrows(EmptyStackException.class, () -> PostfixEvaluator.evaluatePostfix("5 +"));
}
@Test
public void testMoreThanOneStackSizeAfterEvaluation() {
@DisplayName("Should throw IllegalArgumentException for extra operands")
void testExtraOperands() {
assertThrows(IllegalArgumentException.class, () -> PostfixEvaluator.evaluatePostfix("5 6 + 2 * 3"));
}
@Test
@DisplayName("Should throw ArithmeticException for division by zero")
void testDivisionByZero() {
assertThrows(ArithmeticException.class, () -> PostfixEvaluator.evaluatePostfix("1 0 /"));
}
@Test
@DisplayName("Should throw IllegalArgumentException for invalid characters")
void testInvalidToken() {
assertThrows(IllegalArgumentException.class, () -> PostfixEvaluator.evaluatePostfix("1 a +"));
}
}