Update coverage to use nunit3 runner

Author: canton7

Rakefile

@@ -42,24 +42,23 @@ task :build do
 end
 
 task :test_environment do
-  NUNIT_TOOLS = 'src/packages/NUnit.Runners.*/tools'
-  NUNIT_CONSOLE = Dir[File.join(NUNIT_TOOLS, 'nunit-console.exe')].first
-  NUNIT_EXE = Dir[File.join(NUNIT_TOOLS, 'nunit.exe')].first
+  NUNIT_TOOLS = 'src/packages/NUnit.ConsoleRunner.*/tools'
+  NUNIT_CONSOLE = Dir[File.join(NUNIT_TOOLS, 'nunit3-console.exe')].first
 
   OPENCOVER_CONSOLE = Dir['src/packages/OpenCover.*/tools/OpenCover.Console.exe'].first
   REPORT_GENERATOR = Dir['src/packages/ReportGenerator.*/tools/ReportGenerator.exe'].first
 
   UNIT_TESTS_DLL = "bin/#{CONFIG}/StateMechanicUnitTests.dll"
 
-  raise "NUnit.Runners not found. Restore NuGet packages" unless NUNIT_CONSOLE && NUNIT_EXE
+  raise "NUnit.ConsoleRunner not found. Restore NuGet packages" unless NUNIT_CONSOLE
   raise "OpenCover not found. Restore NuGet packages" unless OPENCOVER_CONSOLE
   raise "ReportGenerator not found. Restore NuGet packages" unless REPORT_GENERATOR
 end
 
 desc "Generate unit test code coverage reports for CONFIG (or Debug)"
 task :cover => [:test_environment, COVERAGE_DIR] do
   coverage_file = File.join(COVERAGE_DIR, File.basename(UNIT_TESTS_DLL).ext('xml'))
-  sh %Q{#{OPENCOVER_CONSOLE} -register:user -target:"#{NUNIT_CONSOLE}" -targetargs:"#{UNIT_TESTS_DLL} /noshadow" -filter:"+[StateMechanic]*" -excludebyattribute:*.ExcludeFromCoverageAttribute -output:"#{coverage_file}"}
+  sh %Q{#{OPENCOVER_CONSOLE} -register:user -target:"#{NUNIT_CONSOLE}" -targetargs:"#{UNIT_TESTS_DLL}" -filter:"+[StateMechanic]*" -excludebyattribute:*.ExcludeFromCoverageAttribute -output:"#{coverage_file}"}
 
   rm('TestResult.xml', :force => true)