This PR significantly expands the test coverage for BitmapRangeIterator by adding comprehensive test cases that cover edge cases and complex bitmap patterns.

Changes Made

Expanded test coverage from 3 to 18 test cases, adding 229 lines of well-structured test code that covers:

Core Functionality Tests

• Multiple separate ranges: Non-consecutive bit patterns like [1,0,1,0,1,0,0,0,0,0]
• End-of-bitmap ranges: Patterns with bits at the end like [0,0,0,0,0,0,0,1,1,1]
• Full bitmap scenarios: Testing when all bits are set [1,1,1,1,1,1,1,1,1,1]
• Complex mixed patterns: Multi-range scenarios like [1,1,0,0,1,1,1,0,0,1]

Edge Cases

• Boundary conditions: First bit only, last bit only, and first+last combinations
• Single bit at end: Testing [0,0,0,0,0,0,0,0,0,1] patterns
• Empty ranges: Verifying proper handling when no bits are set

Advanced Scenarios

• Custom starting positions: Testing iterator with different starting indices
• Beyond bounds: Testing iterator behavior when starting beyond bitmap size
• Large bitmap scalability: Testing with 32-bit bitmaps
• Alternating patterns: Performance testing with many small ranges
• Sparse distributions: Testing with large gaps between set bits

Example of a complex test case:

WHEN("set complex pattern [0,1,1,0,0,1,0,1,1,1,0,0,1,1,0,0]")
{
    bitmap.setBits(1, 2);   // bits 1-2
    bitmap.setBits(5, 1);   // bit 5
    bitmap.setBits(7, 3);   // bits 7-9
    bitmap.setBits(12, 2);  // bits 12-13

    THEN("iterator returns ranges: {1,2}, {5,1}, {7,3}, {12,2}")
    {
        REQUIRE(*iterator.next() == std::make_pair(1UL, 2UL));
        REQUIRE(*iterator.next() == std::make_pair(5UL, 1UL));
        REQUIRE(*iterator.next() == std::make_pair(7UL, 3UL));
        REQUIRE(*iterator.next() == std::make_pair(12UL, 2UL));
        REQUIRE(!iterator.next());
    }
}

Code Quality

• Maintains consistent BDD-style testing format (SCENARIO/GIVEN/WHEN/THEN)
• Follows existing coding conventions and indentation
• Uses descriptive test names with bitmap patterns in comments
• Windows kernel-compatible with no C++ exceptions
• All tests use the same assertion patterns as existing code

The expanded test suite provides comprehensive validation of the BitmapRangeIterator functionality and ensures robust handling of various bitmap patterns and edge cases.

Fixes #28.

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