Add code coverage and publish it in azure pipelines

azure-pipelines.yml

@@ -44,12 +44,32 @@ steps:
     cd ..
   workingDirectory: '$(modulePath)'  
   displayName: 'Build rocksdb'
-
+
+- script |
+    go get github.com/jstemmer/go-junit-report
+    go get github.com/axw/gocov/gocov
+    go get github.com/AlekSi/gocov-xml
+    go get -u gopkg.in/matm/v1/gocov-html
+
 - script: |
     go version
     go mod download
-    go test -v -coverprofile=coverage.txt -covermode=atomic ./...
+    go test -v -coverprofile=coverage.txt -covermode=atomic ./... 2>&1 | go-junit-report > report.xml
     go vet -composites=false ./...
+    gocov convert coverage.txt > coverage.json
+    gocov-xml < coverage.json > coverage.xml
+    mkdir coverage
+    gocov-html < coverage.json > coverage/index.html    
   workingDirectory: '$(modulePath)'
   displayName: 'Get dependencies, then build'
 
+- task: PublishTestResults@2
+  inputs:
+    testRunner: JUnit
+    testResultsFiles: $(System.DefaultWorkingDirectory)/**/report.xml
+
+- task: PublishCodeCoverageResults@1
+  inputs:
+    codeCoverageTool: Cobertura 
+    summaryFileLocation: $(System.DefaultWorkingDirectory)/**/coverage.xml
+    reportDirectory: $(System.DefaultWorkingDirectory)/**/coverage