Add automated integration testing framework with CI/CD pipeline

[vipul-09]

Purpose

Implemented an automated integration testing framework for eSim using pytest and ngspice.

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Features Added

• Automated ngspice simulation execution
• Multi-circuit regression testing
• GitHub Actions CI/CD integration
• HTML test report generation
• Parameterized pytest-based testing
• Reusable simulation utility module

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Testcases Added

• RC Circuit
• RL Circuit
• RLC Circuit

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Technologies Used

• Python
• pytest
• ngspice
• pytest-html
• GitHub Actions

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CI/CD

Added GitHub Actions workflow to automatically:

• install dependencies
• run automated tests
• generate reports
• validate simulations on push and pull requests