Config VSCode to debug istio using vscode debug codelens

 VS Code debug test codelens is great to just run a particular test, however specify necessary arguments have been a bit mystery. However, manipulate settings.json file, one can get things done.

 

Open settings.json file, and add the following section, you will be able to specify flags for both build and test.

"go.buildTags": "integ",

"go.testFlags":["-args", "--istio.test.kube.topology=${workspaceFolder}/localtests.external-istiod.json", "--istio.test.skipVM"],

 Notice that the go.buildTags are needed to make sure that build actually work.

go.testFlags gets used to specify parameters for build and test. anything before "-args" is considered for build and anything after "-args" is considered test parameters. So in istio integration test, we will simply specify whatever necessary parameters after "-args", then click on the debug button of some of the tests and set up break point, you can step through the code in debug mode.