test: Add Callgraph Signature Tests

[abhisek]

• test: Add callgraph signature tests
• test: Add Java arg matching tests

[safedep]

SafeDep Report Summary

Package Details

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[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for callgraph signature matching across multiple programming languages (Python, Go, and Java). The tests validate that the signature matcher correctly identifies function/method calls and supports advanced features like argument matching by index and type resolution.

Key Changes:

• Added signature matching test cases for Python, Go, and Java to verify detection of common function calls
• Added Java argument matching tests to validate literal value matching, multi-argument matching, and type resolution
• Added test fixture file for Java argument matching scenarios

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
plugin/callgraph/signatures_test.go	Added test cases for Python, Go, and Java signature matching, including argument matching scenarios
plugin/callgraph/imports.go	Added blank lines for consistent formatting
plugin/callgraph/fixtures/testJavaArguments.java	Added new test fixture with Java code demonstrating various argument matching scenarios

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.31%. Comparing base (d5457fc) to head (9cecd7d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   60.23%   61.31%   +1.07%     
==========================================
  Files          47       47              
  Lines        5289     4123    -1166     
==========================================
- Hits         3186     2528     -658     
+ Misses       1825     1316     -509     
- Partials      278      279       +1     

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