test: add unit test for src/libs/langchain/loaders/pdf/index.ts

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Trigger Info

Trigger Type	Triggered By	Source Pull Request	Assignment
Auto Rebase	arvinxx	5732	Detail

Summary

This PR introduces unit tests for the PdfLoader module, ensuring its functionality and robustness. The tests cover the following scenarios:

• Successful PDF Loading and Page Splitting: Verifies that the PdfLoader correctly loads a PDF and splits its content into pages.

• Handling Empty PDFs: Ensures the loader gracefully handles empty PDF files without errors.

• Error Handling: Confirms that the loader appropriately throws an error when PDF loading fails.

• Option Passing: Validates that the splitPages option is correctly passed to the underlying PDFLoader.

Mocking is used extensively to simulate the behavior of the PDFLoader from the @langchain/community/document_loaders/fs/pdf package, allowing for isolated and controlled testing.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.12%. Comparing base (0e1a022) to head (79fafe9).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #5738    +/-   ##
========================================
  Coverage   92.12%   92.12%            
========================================
  Files         648      649     +1     
  Lines       58174    58181     +7     
  Branches     2713     2911   +198     
========================================
+ Hits        53593    53600     +7     
  Misses       4581     4581            

Flag	Coverage Δ
app	92.12% <ø> (+<0.01%)	⬆️
server	98.01% <ø> (ø)

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TestGru Assignment

Summary

Link	CommitId	Status	Reason
Detail	79fafe9	🚫 Skipped	No files need to be tested {"src/libs/langchain/loaders/pdf/index.test.ts":"target file(src/libs/langchain/loaders/pdf/index.test.ts) not in work scope \n include: /*.ts,/.tsx,**/.js,/*.jsx \n exclude: node_modules,/.test.ts,**/.test.tsx,/*.spec.ts,/.spec.tsx,**/.d.ts,/*.test.js,/*.spec.js"}

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