Golang coverage report was official supported by go test -coverprofile.

This tool makes it available for integration test of long-run project, e.g. a web server.

Most code is copied from golang cmd/cover and testing pakcage.

Support golang 1.11+.

1. Run the following script

   # prepare temp directory
   mkdir /tmp/gopath
   cd /tmp/gopath
   
   # go get
   GOPATH=/tmp/gopath go get github.com/ikarishinjieva/golang-live-coverage-report/cmd/golang-live-coverage-report
   
   # build demo
   cd /tmp/gopath/src/github.com/ikarishinjieva/golang-live-coverage-report/examples/
   GOPATH=/tmp/gopath PATH=$GOPATH/bin:$PATH make
   
   # start demo server
   ./demo 
   

2. open a browser with http://localhost:8080/report, you will see a report like:

3. open http://localhost:8080/run_once, to run the target function once

4. open http://localhost:8080/report again, you will see the report with some code line already covered

The brief steps of this tool are:

1. Before building your project, run golang-live-coverage-report -pre-build ... {files-included-in-the-report}:

   1.1 This tool will copy the files to temporary directory (-raw-code-build-dir)

   1.2 This tool will inject some codes into the files

   1.3 This tool will generate a bootstrap golang file (-bootstrap-outfile), the package name could be specified by -bootstrap-package-name

2. Build your project:

   2.1 Add a HTTP handler using GenerateHtmlReport() in your code, example is here

   2.2 Compile your project with the bootstrap file

   2.3 Remember to exclude the temporary directory in step 1.1 when compiling

   2.4 Copy the temporary directory to {your building directory}/{path specified by '-raw-code-deploy-dir'}

3. After building your project, run golang-live-coverage-report -post-build ... {files-included-in-the-report} to rollback the changes:

   3.1 Remove the bootstrap file in step 1.3

   3.2 Rollback the injected files, with files in temporary directory in step 1.1

   3.3 Remove the temporary directory in step 1.1

4. The entire process example is here