=== NUnit Testing Example with Engine ===

Running tests with NUnit Engine...

Error running tests with NUnit Engine: The value cannot be an empty string. (Parameter 'path')

Falling back to manual test execution...

Running Calculator Tests:
-------------------------
  ✓ Add_TwoNumbers_ReturnsSum
  ✓ Subtract_TwoNumbers_ReturnsDifference
  ✓ Multiply_TwoNumbers_ReturnsProduct
  ✓ Divide_ByZero_ThrowsException
  ✓ Divide_TwoNumbers_ReturnsQuotient

Running String Utils Tests:
---------------------------
  ✓ Reverse_SimpleString_ReturnsReversed
  ✓ IsPalindrome_WithPalindrome_ReturnsTrue
  ✓ IsPalindrome_WithNonPalindrome_ReturnsFalse

=== Test Summary ===
Total Tests: 8
Passed: 8
Failed: 0
Success Rate: 100.0%

Result: NUnit Engine test execution completed!