[TestGru] Add unit test for src/main/java/com/example/demo/DemoApplication.java

[gru-agent]

Trigger Info

Trigger Type	Triggered By	Source File	Assignment
Manual	Bazinga-Wang	src/main/java/com/example/demo/DemoApplication.java	Detail

Summary

This PR enhances the test coverage for the DemoApplication class by adding the following test cases:

• testMainMethod: Verifies that the main method executes successfully with non-empty arguments.

• testMainMethodWithEmptyArgs: Ensures the main method runs correctly when provided with an empty arguments array. A random port is set to avoid conflicts during the test.

• testMainMethodWithNullArgs: Validates that passing null as arguments to the main method throws an IllegalArgumentException.

Additionally, the OutputCaptureExtension is added to the test class to facilitate capturing system output if needed in future tests. These changes improve the robustness and reliability of the application's entry point.

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