Detailed code coverage and benchmarking support for golang

[Ankush-Goyal]

Is your feature request related to a problem? Please describe.

Can we implement a formal way of viewing code coverage like a gutter, highlight based and also percentage based for files.

Describe the solution you'd like
Gutter: it shows the lines of code covered by test cases on the left side similar to where debug points are shown

Highlight: shows the actual lines highlighted as different color codes

Percentage: shows a tabular format in percentages for folder as well as file level. Somewhat similar to how goland has done it.

Additional context
Goland supports a great ui for ease of testing. Just selecting option and it fires of the coverage. It would be great if we can get a similar feature in place.

Note: As per my research, vs code doesn't have something similar. Correct me if I am wrong and would help if you can provide a documentation or useful tutorial for it

[hyangah]

@Ankush-Goyal I am not sure about Percentage info yet, but Coverage info visulaization using Gutter/Highlight is already available. See https://github.com/golang/vscode-go/blob/master/docs/features.md#code-coverage and type of https://github.com/golang/vscode-go/blob/master/docs/settings.md#gocoveragedecorator.
If the current feature is insufficient, can you show the screenshot of goland vs vscode, and repro case?

cc @pjweinb

[Ankush-Goyal]

@hyangah I created a small even odd program to show the usecase. Attaching the screenshot below for UI difference between goland and VScode. The current interface on vscode is like a terminal based detailing for test. Goland provides a user interface which is easily navigable for different type of use cases such as test, profiling etc.

Getting this implemented will improve user experience for golang developers.

[hyangah]

Thanks. It looks like you want CPU profile support.

For gutter-style code coverage presentation, try https://github.com/golang/vscode-go/blob/master/docs/settings.md#gocoveragedecorator

[firelizzard18]

FYI, VSCode is adding support for coverage to the testing API. See microsoft/vscode#123713 for details on the proposed API.

[Ankush-Goyal]

@hyangah CPU profile support is one part to it. Benchmarking, testing race condition, Memory profiling, flamegraph these are some of the extra pointers I can say,. Still I would say Testing, Benchmarking, Memory and CPU profiling should be given importance for starters.

[firelizzard18]

@Ankush-Goyal That is a very broad request; in Atlassian's terminology, I would call this an epic. If you break this down into multiple issues, one per feature (user stories), it would be much easier to address.

[firelizzard18]

@Ankush-Goyal There is an existing plan (discussed on #1579) to add profiling of tests and benchmarks and a way to view those profiles as a flow graph. #1724 covers creating diff profiles and #1725 covers profiling main functions. If you want additional features, I recommend you create specific issues.

[hyangah]

Closing. Thanks for sharing ideas. @Ankush-Goyal
As @firelizzard18 advised, please create specific issues.