Code coverage for Nim using LCOV.

• Line & Branch coverage support
• Forwards nim compiler options
• Works out-of-the box with Nim unittests
• API + CLI
• HTML report

Install using Nimble:

nimble install coco

Generate a code coverage report:

coco --target "tests/**/*.nim" --cov '!tests' --compiler="--hints:off" 

The flag --target tells Coco to run and compile nim files in the tests/ directory (and subdirectories if any).

The flag --cov is helpful for extracting or removing data from the file *.info. Here we don't want code coverage for our tests, only for our main library coco.

The flag --compiler forwards its value directly to the Nim compiler.

To get the full list of available flags, type in your shell coco -h

By default, Coco will generate a lcov.info file on your project root folder and create a report under coverage/.

To check your report, open the file coverage/index.htmlin your browser:

Install Coverage Gutters.

This nice plugin will map your coverage to your source code right into VScode:

import and use:

import coco

discard coverage(target = "tests/foo.nim", branch = true)

You can find the full documentation here: API Coco

This task has only been tested under MacOSX. Feel free to open a pull request to share your experiments to code coverage Nim projects.

• Support for subdirectories in tests/
• Coveralls.io integration

Linux Test Project - Coverage » lcov