Fix DotNetCoreCLI@2 test command to fail when no project files found

[Copilot]

The DotNetCoreCLI@2 task's test command was inconsistently handling missing project files compared to other commands. When no project files matched the specified pattern, the test command would only log a warning and succeed, while other commands (build, restore, pack, push) would properly fail the task.

This dangerous behavior could lead to scenarios where teams believe their tests passed when they actually never ran due to typos in project file paths or missing files.

Problem

- task: DotNetCoreCLI@2
  displayName: 'dotnet test'
  inputs:
    command: 'test'
    projects: garbage.dll  # Typo or non-existent file

Before this fix:

• Task succeeds with warning: "Project file(s) matching the specified pattern were not found."
• Pipeline continues, giving false confidence that tests passed

After this fix:

• Task fails with error: "Project file(s) matching the specified pattern were not found."
• Pipeline stops, alerting developers to the configuration issue

Solution

Changed the executeTestCommand() method in dotnetcore.ts to throw an error instead of logging a warning when no project files are found, making it consistent with other dotnet commands.

// Before
if (projectFiles.length === 0) {
    tl.warning(tl.loc('noProjectFilesFound'));
    return;
}

// After  
if (projectFiles.length === 0) {
    throw tl.loc('noProjectFilesFound');
}

Also updated the corresponding test case to expect task failure instead of success.

This ensures all DotNetCoreCLI commands now behave consistently when project files are not found, preventing silent failures that could mask configuration errors.

Fixes #21193.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• 03nvsblobprodwcus014.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 055vsblobprodwcus02.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 1g1vsblobprodwcus01.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 3eavsblobprodwcus03.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 3zgvsblobprodwcus024.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• 40qvsblobprodwcus022.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 4fdvsblobprodwcus012.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• 5tbvsblobprodwcus06.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 61cvsblobprodwcus010.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• 73dvsblobprodwcus07.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 8usvsblobprodwcus011.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• 9owvsblobprodwcus020.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• arpvsblobprodwcus017.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• crcvsblobprodwcus021.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• fslvsblobprodwcus015.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• grnvsblobprodwcus04.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• k92vsblobprodwcus08.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• mnzvsblobprodwcus05.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• pl8vsblobprodwcus09.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• uubvsblobprodwcus018.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• vwmvsblobprodwcus016.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• x4wvsblobprodwcus013.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• xg1vsblobprodwcus019.vsblob.vsassets.io
  • Triggering command: npm install (dns block)
• xlkvsblobprodwcus023.vsblob.vsassets.io
  • Triggering command: npm install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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