Add git-link-interactive-simulation integration test

[Copilot]

This PR adds a comprehensive integration test for the git-link function that simulates real-world usage with an actual git repository.

Changes

• Added git-link-interactive-simulation test function to git-link-test.el
• The test creates a temporary git repository with proper configuration
• Tests the complete workflow: file creation, git operations, and URL generation
• Verifies the generated URL matches the expected GitHub format

Test Details

The new test function:

1. Creates a temporary directory with a real git repository
2. Sets up git configuration (user.name, user.email)
3. Adds a GitHub remote origin (https://github.com/user/repo.git)
4. Creates a test file with 5 lines of content
5. Commits the file to the repository
6. Opens the file in a buffer and positions cursor at line 3
7. Calls git-link function with parameters ("origin", 3, nil)
8. Verifies the result matches: "https://github.com/user/repo/blob/master/test-file.txt#L3"
9. Properly cleans up all resources using unwind-protect

Testing

All tests pass successfully:

• Previous 25 tests continue to pass
• New integration test passes and takes ~50ms (indicating real git operations)
• Test can be run individually or as part of the full suite

This test provides valuable coverage for the main git-link function end-to-end workflow, complementing the existing unit tests that focus on individual helper functions.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

This pull request was created as a result of the following prompt from Copilot chat.

Add the git-link-interactive-simulation function to git-link-test.el.

(ert-deftest git-link-interactive-simulation ()
  "Test interactive git-link function call with cursor at line 3 using real git repo."
  (let ((test-dir (make-temp-file "git-link-test" t)))
    (unwind-protect
        (let ((default-directory test-dir)
              git-link-add-to-kill-ring  ; Don't add to kill ring during test
              git-link-open-in-browser)  ; Don't open browser during test
          
          ;; Set up a real git repository
          (shell-command "git init")
          (shell-command "git config user.name 'Test User'")
          (shell-command "git config user.email 'test@example.com'")
          (shell-command "git remote add origin https://github.com/user/repo.git")
          
          ;; Create test file with content
          (with-temp-file (expand-file-name "test-file.txt" test-dir)
            (insert "Line 1\nLine 2\nLine 3\nLine 4\nLine 5\n"))
          
          ;; Add and commit the file
          (shell-command "git add test-file.txt")
          (shell-command "git commit -m 'Initial commit'")
          
          ;; Create a buffer visiting the file and position cursor at line 3
          (with-current-buffer (find-file-noselect (expand-file-name "test-file.txt" test-dir))
            (goto-char (point-min))
            (forward-line 2) ; Move to line 3
            
            ;; Call git-link interactively
            (let ((result (git-link "origin" 3 nil))) ; Line 3, no end line
              ;; Verify the result is the complete expected URL
              (should (equal "https://github.com/user/repo/blob/master/test-file.txt#L3" result)))
            
            ;; Clean up buffer
            (kill-buffer)))
      
      ;; Clean up temporary directory
      (when (file-exists-p test-dir)
        (delete-directory test-dir t)))))

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