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testing: refactor to ParameterizedTest PrefixEvaluatorTest #6415

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Merged
merged 2 commits into from
Jul 22, 2025
Merged

testing: refactor to ParameterizedTest PrefixEvaluatorTest #6415

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testing: refactor to ParameterizedTest PrefixEvaluatorTest
alxkm Jul 18, 2025
655cd2d
Merge branch 'master' into testing/PrefixEvaluatorTest
DenizAltunkapan Jul 22, 2025
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18 changes: 11 additions & 7 deletions src/test/java/com/thealgorithms/stacks/PrefixEvaluatorTest.java
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Expand Up @@ -4,24 +4,28 @@
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 PrefixEvaluatorTest {

@Test
public void testValidExpressions() {
assertEquals(10, PrefixEvaluator.evaluatePrefix("+ * 2 3 4"));
assertEquals(5, PrefixEvaluator.evaluatePrefix("- + 7 3 5"));
assertEquals(6, PrefixEvaluator.evaluatePrefix("/ * 3 2 1"));
@ParameterizedTest(name = "Expression: \"{0}\" → Result: {1}")
@CsvSource({"'+ * 2 3 4', 10", "'- + 7 3 5', 5", "'/ * 3 2 1', 6"})
void testValidExpressions(String expression, int expected) {
assertEquals(expected, PrefixEvaluator.evaluatePrefix(expression));
}

@Test
public void testInvalidExpression() {
@DisplayName("Should throw EmptyStackException for incomplete expression")
void testInvalidExpression() {
assertThrows(EmptyStackException.class, () -> PrefixEvaluator.evaluatePrefix("+ 3"));
}

@Test
public void testMoreThanOneStackSizeAfterEvaluation() {
@DisplayName("Should throw IllegalArgumentException if stack not reduced to one result")
void testMoreThanOneStackSizeAfterEvaluation() {
assertThrows(IllegalArgumentException.class, () -> PrefixEvaluator.evaluatePrefix("+ 3 4 5"));
}
}