Add integration tests for Save-SqlDscSqlServerMediaFile command

[Copilot]

• Analyze the existing codebase and understand Save-SqlDscSqlServerMediaFile command functionality
• Review existing unit tests and integration test patterns
• Examine Prerequisites.Integration.Tests.ps1 where the command is currently used
• Set up build environment and resolve dependencies
• Create comprehensive integration test file following DSC Community guidelines
• Implement tests for different scenarios: direct ISO download, EXE download with extraction, SkipExecution mode
• Add integration test file to appropriate pipeline group in azure-pipelines.yml (Group 0 alongside Prerequisites)
• Update CHANGELOG.md with the new integration test addition
• Validate PowerShell syntax of integration test file
• Run unit tests to ensure no regressions (all 11 tests pass)
• Test integration test discovery phase (7 tests discovered successfully)
• Validate build system integration
• Run Script Analyzer validation (no issues found)
• FIXED: Address feedback comments
  • Fixed test isolation by creating separate subdirectories for each test context
  • Updated error message to reference 'noop' task instead of 'build'
  • Added proper blank line ending to file
  • Updated README.md with integration test dependency information
• FIXED: Resolve ISO file safety check conflicts
  • Final fix for "Should overwrite existing file when Force parameter is used" test
  • Root cause: Command's safety check prevents execution when ANY ISO files exist in destination
  • Previous approaches failed because the safety check is too restrictive for ISO-based overwrite testing
  • Solution: Changed test to use SkipExecution with executable download instead of ISO download
  • This properly tests Force parameter's ShouldProcess behavior without triggering the safety check
  • Test creates dummy executable file, then downloads real executable with Force to overwrite it
• REFINED: Simplified error test validation
  • Removed specific error message validation from integration test as requested
  • Changed from Should -Throw -ExpectedMessage '*InvalidDestinationFolder*' to Should -Throw
  • Integration tests focus on behavior validation rather than specific error message testing

Latest Refinement:
Simplified the error condition test in the integration tests by removing the specific error message check. Integration tests should focus on testing that the expected behavior occurs (error is thrown) rather than validating specific error messages, which is more appropriate for unit tests.

This follows integration testing best practices where we test the overall behavior and outcomes rather than implementation details like specific error messages.

Fixes #2237.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94%. Comparing base (52e707f) to head (9575bb9).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2268   +/-   ##
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  Coverage    94%     94%           
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  Files       149     149           
  Lines      9163    9163           
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  Hits       8687    8687           
  Misses      476     476           

Flag	Coverage Δ
unit	94% <ø> (ø)

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