Testing the Main Class of a Spring Boot Application

Date: 2025-01-10

This article details various methods for testing a Spring Boot application's main class using JUnit 5 and Spring Boot's testing framework. It covers three approaches: verifying the application context loads correctly using @SpringBootTest and an empty contextLoads method; testing the main method's execution without exceptions; and testing command-line argument handling. The article also shows how to mock SpringApplication.run() to prevent the application from actually starting during tests, focusing instead on verifying method calls. These tests ensure the application starts properly and handles configurations correctly, catching potential issues early.

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