bootstraponline/coverage_examples

coverage_examples

Languages & Coverage tools

• Go
  • https://github.com/codecov/example-go
• Python
  • https://pypi.org/project/coverage/
  • https://github.com/codecov/example-python
• Java & Kotlin
  • https://github.com/jacoco/jacoco
  • https://github.com/codecov/example-gradle (Android)
• JavaScript & TypeScript
  • https://github.com/istanbuljs
  • https://github.com/codecov/example-node
• Swift
  • https://github.com/SlatherOrg/slather
  • https://github.com/codecov/example-swift (iOS)

Generate Coverage

Steps to generate coverage for each supported language.

Go

Install gocover-cobertura

$ go get golang.org/x/tools/cmd/cover
$ go get github.com/t-yuki/gocover-cobertura

cd example-go
go test -race -coverprofile=coverage.txt -covermode=atomic
gocover-cobertura < coverage.txt > coverage.xml

Go native coverage is coverage.txt and cobertura is coverage.xml

Python

pip3 install coverage
coverage run tests.py
coverage xml

.coverage from coverage run is the native coverage format. coverage.xml from coverage xml is cobertura.

Java & Kotlin

cd example-gradle
./gradlew check
./gradlew jacocoTestReport

Coverage file is in ./build/reports/jacoco/test/jacocoTestReport.xml

JavaScript & TypeScript

cd example-node
cd istanbul-mocha
npm install .

Create .istanbul.yml with:

reporting:
  print: summary
  reports:
    - cobertura

Run npm run test

./coverage/coverage.json is the native format ./coverage/cobertura-coverage.xml is the cobertura format.

Swift

Install and configure Ruby.

brew install ruby

# ruby
export PATH="/usr/local/opt/ruby/bin:$PATH"
# Based on `gem environment gemdir`
export PATH="/usr/local/lib/ruby/gems/3.0.0/bin:$PATH"

Run tests and generate coverage.

cd example-swift
gem install slather
open SwiftExample.xcodeproj/

• Product -> Scheme -> Edit Scheme.
• Click on the Test target and select Options...
• Verify the Code Coverage box is checked and it says Gather coverage for all targets
• Add new Scheme SwiftExampleTests and ensure the Shared box is checked
• Enable coverage for the newly added scheme

Run the tests:

xcodebuild test -scheme SwiftExampleTests -destination 'platform=iOS Simulator,name=iPhone 12,OS=latest' -derivedDataPath output

Process coverage

slather coverage -x --build-directory output --scheme SwiftExampleTests --binary-basename SwiftExample SwiftExample.xcodeproj

The coverage will be in cobertura.xml