🚀 Fintech Impact Services (Dev Repository)

Spring Boot–based impact analysis service for intelligent CI test selection using Git diff analysis and JGit.

This repository acts as the orchestration and impact-analysis engine for a cross-repository selective testing framework.

📌 Overview

This repository contains the Fintech Spring Boot microservice that exposes an API for impact-based test selection.

It is part of a cross-repository CI/CD intelligence system where code changes are analyzed to determine impacted test suites dynamically.

📌 Project Status

This repository is a proof-of-concept (PoC) demonstrating deterministic impact-aware CI execution using Git diff analysis.

The implementation was validated in controlled scenarios to dynamically map code changes to impacted Karate test suites.

⚙️ Core Responsibilities

• Detect changed files using JGit diff analysis
• Map source code changes to Karate test tags
• Expose impact-analysis APIs for CI pipelines
• Enable selective test execution instead of full regression runs

🏗 Architecture Role

Dev Repo (fintech-impact-services)
        │
        ├── Spring Boot Application
        ├── JGit Diff Analysis
        ├── Impact Mapping Engine
        ├── REST API (/test-selector)
        ▼
Test Automation Repo (karate-change-impact-test)
        ├── Calls API
        ├── Fetches impacted tags
        └── Runs selected Karate tests

🔁 Workflow

1. Git Change Detection

The service compares branches using JGit:

• Identifies changed files
• Extracts file paths from diff

2. Impact Mapping Logic

Files are mapped to test execution tags.

📊 Mapping Rules

Change Type	Test Tag
/payments/	@payments
/transactions/	@transactions
/transfer/	@transfers
/auth/	@regression
pom.xml	@regression
No match	@smoke

3. API Exposure

Endpoint:

HTTP GET /api/dev-ops/test-selector?targetBranch=main~1

Response Example

Json

{
  "impacted_tags": "@payments,@transactions"
}

⚙️ How It Works Internally

• Uses JGit to compute diff between branches
• Extracts modified file paths
• Applies rule-based mapping engine
• Returns impacted test tags as JSON

🚀 Run Locally

Prerequisites Java 17 Maven Git

Start Application

bash

mvn spring-boot:run

🔍 Test API

curl

http://localhost:8080/api/dev-ops/test-selector?targetBranch=main~1

📦 Tech Stack

• Java 17
• Spring Boot
• JGit
• Maven

📊 Key Benefits

• 🔁 Enables deterministic impact-based test selection
• ⏱ Demonstrated CI runtime reduction in controlled scenarios
• 💰 Reduces unnecessary regression execution
• 🧠 Supports targeted test execution in microservice environments
• 🔗 Integrates with GitHub Actions–based CI workflows

🧠 Design Highlights

• Git diff–based analysis engine
• Rule-based tag mapping
• Designed for GitHub Actions–based CI integration

📌 Why This Matters

In microservice architectures, running full regression suites for every change creates CI bottlenecks and unnecessary compute overhead.

This project demonstrates a lightweight deterministic approach to impact-aware CI execution without requiring external dependency graph tooling or SaaS platforms.

⚠️ Known Limitations

• Rule-based mapping (not ML-driven)
• Requires full git history for accurate diff
• Depends on branch comparison strategy

👨‍💻 Author

Designed and implemented a Git diff–based impact analysis service for intelligent test selection in CI/CD pipelines.