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feat: Add PostfixEvaluator new algorithm with Junit tests (#5754)

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Hardik Pawar
2024-10-13 16:20:31 +05:30
committed by GitHub
parent 596c6147af
commit b0c8a8f0ce
3 changed files with 103 additions and 0 deletions
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src/test/java/com/thealgorithms/stacks/PostfixEvaluatorTest.java Normal file
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package com.thealgorithms.stacks;
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.Test;
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 +"));
}
@Test
public void testInvalidExpression() {
assertThrows(EmptyStackException.class, () -> PostfixEvaluator.evaluatePostfix("5 +"));
}
@Test
public void testMoreThanOneStackSizeAfterEvaluation() {
assertThrows(IllegalArgumentException.class, () -> PostfixEvaluator.evaluatePostfix("5 6 + 2 * 3"));
}
}