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Testing LongStack Operations Implementation in Alibaba Arthas

This test suite validates the LongStack implementation in Arthas core utilities, focusing on stack operations and boundary behaviors. The tests verify push/pop operations, overflow handling, and edge cases for a long-based stack data structure.

Test Coverage Overview

The test suite provides comprehensive coverage of LongStack operations:

Basic push and pop operations with various stack sizes
Stack overflow scenarios and circular buffer behavior
Empty stack handling and boundary conditions
Multiple push-pop sequences with different stack capacities

Implementation Analysis

The testing approach employs JUnit 4 framework to systematically verify stack behavior. Each test method focuses on specific scenarios using Assert statements to validate expected outcomes.

The implementation uses a methodical pattern of pushing values, then verifying pop operations match expected stack behavior, particularly for overflow conditions.

Technical Details

Testing Framework: JUnit 4
Test Class: LongStackTest
Key Components: ThreadLocalWatch.LongStack
Test Scenarios: 5 distinct test methods
Stack Configurations: Various sizes (2, 10, 100 elements)

Best Practices Demonstrated

The test suite exemplifies strong testing practices through isolated test cases, clear method naming, and comprehensive scenario coverage.

Systematic test organization with incremental complexity
Edge case handling for stack overflow and empty conditions
Consistent assertion patterns for result verification
Independent test methods for different behavioral aspects

alibaba/arthas

core/src/test/java/com/taobao/arthas/core/util/LongStackTest.java

            
package com.taobao.arthas.core.util;

import org.junit.Assert;
import org.junit.Test;

import com.taobao.arthas.core.util.ThreadLocalWatch.LongStack;

/**
 * 
 * @author hengyunabc 2019-11-20
 *
 */
public class LongStackTest {

    @Test
    public void test() {
        LongStack stack = new LongStack(100);

        stack.push(1);
        stack.push(2);
        stack.push(3);

        Assert.assertEquals(3, stack.pop());
        Assert.assertEquals(2, stack.pop());
        Assert.assertEquals(1, stack.pop());
    }

    @Test
    public void test2() {
        LongStack stack = new LongStack(100);

        stack.push(1);
        stack.push(2);
        stack.push(3);

        Assert.assertEquals(3, stack.pop());
        Assert.assertEquals(2, stack.pop());
        Assert.assertEquals(1, stack.pop());
        Assert.assertEquals(0, stack.pop());
    }

    @Test
    public void test3() {
        LongStack stack = new LongStack(2);

        stack.push(1);
        stack.push(2);
        stack.push(3);

        Assert.assertEquals(3, stack.pop());
        Assert.assertEquals(2, stack.pop());
        Assert.assertEquals(3, stack.pop());
        Assert.assertEquals(2, stack.pop());
    }

    @Test
    public void test4() {
        LongStack stack = new LongStack(2);

        stack.push(1);
        stack.push(2);

        Assert.assertEquals(2, stack.pop());
        Assert.assertEquals(1, stack.pop());
        Assert.assertEquals(2, stack.pop());
        Assert.assertEquals(1, stack.pop());
    }
    
    @Test
    public void test5() {
        LongStack stack = new LongStack(10);

        stack.push(1);
        stack.push(2);
        stack.push(3);
        stack.pop();
        stack.pop();
        stack.push(4);
        stack.push(5);
        
        stack.push(6);
        stack.pop();

        Assert.assertEquals(5, stack.pop());
        Assert.assertEquals(4, stack.pop());
        Assert.assertEquals(1, stack.pop());
        Assert.assertEquals(0, stack.pop());
    }
}