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Add SortStack algorithm (#5624)

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This commit is contained in:
Hardik Pawar
2024-10-08 21:47:56 +05:30
committed by GitHub
parent 0d68b655d2
commit 136e0e23a4
3 changed files with 141 additions and 0 deletions
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src/test/java/com/thealgorithms/stacks/SortStackTest.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.assertTrue;
import java.util.Stack;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
public class SortStackTest {
private Stack<Integer> stack;
@BeforeEach
public void setUp() {
stack = new Stack<>();
}
@Test
public void testSortEmptyStack() {
SortStack.sortStack(stack);
assertTrue(stack.isEmpty()); // An empty stack should remain empty
}
@Test
public void testSortSingleElementStack() {
stack.push(10);
SortStack.sortStack(stack);
assertEquals(1, stack.size());
assertEquals(10, (int) stack.peek()); // Single element should remain unchanged
}
@Test
public void testSortAlreadySortedStack() {
stack.push(1);
stack.push(2);
stack.push(3);
stack.push(4);
SortStack.sortStack(stack);
assertEquals(4, stack.size());
assertEquals(4, (int) stack.pop());
assertEquals(3, (int) stack.pop());
assertEquals(2, (int) stack.pop());
assertEquals(1, (int) stack.pop());
}
@Test
public void testSortUnsortedStack() {
stack.push(3);
stack.push(1);
stack.push(4);
stack.push(2);
SortStack.sortStack(stack);
assertEquals(4, stack.size());
assertEquals(4, (int) stack.pop());
assertEquals(3, (int) stack.pop());
assertEquals(2, (int) stack.pop());
assertEquals(1, (int) stack.pop());
}
@Test
public void testSortWithDuplicateElements() {
stack.push(3);
stack.push(1);
stack.push(3);
stack.push(2);
SortStack.sortStack(stack);
assertEquals(4, stack.size());
assertEquals(3, (int) stack.pop());
assertEquals(3, (int) stack.pop());
assertEquals(2, (int) stack.pop());
assertEquals(1, (int) stack.pop());
}
}