diff --git a/src/test/java/com/thealgorithms/stacks/MinStackUsingTwoStacksTest.java b/src/test/java/com/thealgorithms/stacks/MinStackUsingTwoStacksTest.java
index e5deb17e9a8f..36bdde49b235 100644
--- a/src/test/java/com/thealgorithms/stacks/MinStackUsingTwoStacksTest.java
+++ b/src/test/java/com/thealgorithms/stacks/MinStackUsingTwoStacksTest.java
@@ -1,38 +1,112 @@
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 MinStackUsingTwoStacksTest {
@Test
- public void testMinStackOperations() {
+ public void testBasicOperations() {
MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
minStack.push(3);
minStack.push(5);
- assertEquals(3, minStack.getMin());
+ assertEquals(3, minStack.getMin(), "Min should be 3");
minStack.push(2);
minStack.push(1);
- assertEquals(1, minStack.getMin());
+ assertEquals(1, minStack.getMin(), "Min should be 1");
minStack.pop();
- assertEquals(2, minStack.getMin());
+ assertEquals(2, minStack.getMin(), "Min should be 2 after popping 1");
+
+ assertEquals(2, minStack.top(), "Top should be 2");
+ }
+
+ @Test
+ public void testPushDuplicateMins() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ minStack.push(2);
+ minStack.push(2);
+ minStack.push(1);
+ minStack.push(1);
+ assertEquals(1, minStack.getMin(), "Min should be 1");
+
+ minStack.pop();
+ assertEquals(1, minStack.getMin(), "Min should still be 1 after popping one 1");
+
+ minStack.pop();
+ assertEquals(2, minStack.getMin(), "Min should be 2 after popping both 1s");
+
+ minStack.pop();
+ assertEquals(2, minStack.getMin(), "Min should still be 2 after popping one 2");
+
+ minStack.pop();
+ // Now stack is empty, expect exception on getMin
+ assertThrows(EmptyStackException.class, minStack::getMin);
}
@Test
- public void testMinStackOperations2() {
+ public void testPopOnEmptyStack() {
MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ assertThrows(EmptyStackException.class, minStack::pop);
+ }
+
+ @Test
+ public void testTopOnEmptyStack() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ assertThrows(EmptyStackException.class, minStack::top);
+ }
+
+ @Test
+ public void testGetMinOnEmptyStack() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ assertThrows(EmptyStackException.class, minStack::getMin);
+ }
+
+ @Test
+ public void testSingleElementStack() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ minStack.push(10);
+ assertEquals(10, minStack.getMin());
+ assertEquals(10, minStack.top());
+
+ minStack.pop();
+ assertThrows(EmptyStackException.class, minStack::getMin);
+ }
+
+ @Test
+ public void testIncreasingSequence() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ minStack.push(1);
+ minStack.push(2);
minStack.push(3);
- minStack.push(5);
- assertEquals(3, minStack.getMin());
+ minStack.push(4);
+
+ assertEquals(1, minStack.getMin());
+ assertEquals(4, minStack.top());
+
+ minStack.pop();
+ minStack.pop();
+ assertEquals(1, minStack.getMin());
+ assertEquals(2, minStack.top());
+ }
+ @Test
+ public void testDecreasingSequence() {
+ MinStackUsingTwoStacks minStack = new MinStackUsingTwoStacks();
+ minStack.push(4);
+ minStack.push(3);
minStack.push(2);
minStack.push(1);
+
assertEquals(1, minStack.getMin());
+ assertEquals(1, minStack.top());
minStack.pop();
assertEquals(2, minStack.getMin());
+ assertEquals(2, minStack.top());
}
}
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