Not sure if there is another hidden settings I should set, but I'm not able to the a report from the tool.
What I did:
Adjusting the test factor input to '1'.
##[debug]FileMatchingPatterns=undefined
##[debug]* Inputs.initializeFileMatchingPatterns()
Adjusting the file matching patterns input to '["**/*","!**/package-lock.json"]'.
##[debug]CodeFileExtensions=undefined
##[debug]* Inputs.initializeCodeFileExtensions()
Adjusting the code file extensions input to '["js","_js","bones","cjs","es","es6","frag","gs","jake","jsb","jscad","jsfl","jsm","jss","jsx","mjs","njs","pac","sjs","ssjs","xsjs","xsjslib","epj","erb","py","cgi","fcgi","gyp","gypi","lmi","py3","pyde","pyi","pyp","pyt","pyw","rpy","smk","spec","tac","wsgi","xpy","pyx","pxd","pxi","eb","numpy","numpyw","numsc","pytb","java","jsp","ts","tsx","cs","cake","csx","linq","php","aw","ctp","fcgi","inc","php3","php4","php5","phps","phpt","cpp","c++","cc","cp","cxx","h","h++","hh","hpp","hxx","inc","inl","ino","ipp","re","tcc","tpp","c","cats","h","idc","cl","opencl","upc","xbm","xpm","pm","sh","bash","bats","cgi","command","env","fcgi","ksh","tmux","tool","zsh","fish","ebuild","eclass","ps1","psd1","psm1","tcsh","csh","rb","builder","eye","fcgi","gemspec","god","jbuilder","mspec","pluginspec","podspec","prawn","rabl","rake","rbi","rbuild","rbw","rbx","ru","ruby","spec","thor","watchr"]'.
##[debug]patternRoot: 'undefined'
##[debug]matchOptions.debug: 'false'
##[debug]matchOptions.nobrace: 'true'
##[debug]matchOptions.noglobstar: 'false'
##[debug]matchOptions.dot: 'true'
##[debug]matchOptions.noext: 'false'
##[debug]matchOptions.nocase: 'true'
##[debug]matchOptions.nonull: 'false'
##[debug]matchOptions.matchBase: 'false'
##[debug]matchOptions.nocomment: 'false'
##[debug]matchOptions.nonegate: 'false'
##[debug]matchOptions.flipNegate: 'false'
##[debug]pattern: '**/*'
##[debug]applying include pattern against original list
##[debug]1 matches
##[debug]pattern: '!**/package-lock.json'
##[debug]trimmed leading '!'. pattern: '**/package-lock.json'
##[debug]applying exclude pattern against original list
##[debug]0 matches
##[debug]1 final results
##[debug]* CodeMetrics.matchFileExtension()
##[debug]* Inputs.codeFileExtensions
##[debug]* Inputs.initialize()
##[debug]File name 'test.cs' has extension 'cs', which is included.
##[debug]* CodeMetrics.constructMetrics()
##[debug]Test File: test.cs (0 lines)
##[debug]* CodeMetrics.initializeIsSufficientlyTested()
##[debug]* Inputs.testFactor
##[debug]* Inputs.initialize()
##[debug]* Inputs.testFactor
##[debug]* Inputs.initialize()
##[debug]* CodeMetrics.initializeSizeIndicator()
##[debug]* CodeMetrics.calculateSize()
##[debug]* Inputs.baseSize
##[debug]* Inputs.initialize()
##[debug]* CodeMetrics.getDeletedFilesNotRequiringReview()