diff --git a/src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java b/src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java
index 882fe644ccd5..682240acd752 100644
--- a/src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java
+++ b/src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java
@@ -4,24 +4,41 @@
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 +"));
+ }
}
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