Add test cases to unit_test_sprites.cpp

[kyriesk]

Description

This pull request adds comprehensive unit tests for three collision-related functions in the sprite module that were previously untested in the unit test suite. The tests adapt test scenarios from test_sprites.cpp (sktest) into proper unit tests using the Catch2 framework.

The new tests ensure that:

• calculate_collision_direction correctly determines the direction of collision between sprites and geometric shapes
• resolve_collision properly resolves collisions by moving objects out of collision states
• sprite_ray_collision accurately detects when sprites intersect with rays

Fixes #(issue related to missing collision tests)

Type of change

• New feature (non-breaking change which adds functionality)

Changes Made

• Added 5 new test cases to coresdk/src/test/unit_tests/unit_test_sprites.cpp:

  1. collision direction between sprites (6 sub-tests)

     • No collision detection
     • Collision detected in multiple directions (left, right, top, bottom)

  2. collision direction between sprite and rectangle (2 sub-tests)

     • No collision detection
     • Collision detected

  3. collision resolution between sprites (3 sub-tests)

     • Successful collision resolution
     • No resolution when sprites don't collide
     • No resolution with zero direction vector

  4. collision resolution between sprite and rectangle (2 sub-tests)

     • Successful collision resolution
     • No resolution when sprite and rectangle don't collide

  5. sprite ray collision detection (6 sub-tests)

     • Ray intersects sprite
     • Ray misses sprite
     • Ray origin at sprite center
     • Different ray directions
     • Ray pointing away from sprite
     • Multiple sprites along same ray

• Added required headers: collisions.h and geometry.h

How Has This Been Tested?

The tests have been written following the existing patterns in unit_test_sprites.cpp and use:

• Catch2 TEST_CASE and SECTION macros
• Standard sprite creation and manipulation functions
• Position-based collision scenarios with known outcomes
• Assertions using REQUIRE and REQUIRE_FALSE macros

All tests use existing resources (rocket_sprt.png, background.png, frog.png) that are already available in the test resources directory.

All tests were run and verified to pass:

cd projects/cmake
cmake --preset Linux
cmake --build build/
cd ../../bin
./skunit_tests "[collision]"

Testing Checklist

• Tested with skunit_tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented test scenarios with descriptive names
• Tests follow existing unit test patterns in the codebase
• My changes generate no new warnings
• Tests are isolated and properly clean up resources (free sprites)
• I have requested a review from ... on the Pull Request

Additional Notes

• All collision direction tests verify both vector magnitude and direction (when collisions occur)
• All collision resolution tests verify position changes before and after resolution
• Ray collision tests cover edge cases including ray origin at sprite center and rays pointing away
• Tests follow the pattern of setting up controlled sprite positions and verifying expected collision behaviors