Add codecov (#920)

Author: natemort

.github/workflows/codecov.yml

@@ -0,0 +1,17 @@
+name: Workflow for Codecov
+on: [push, pull_request]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: 'true'
+      - name: Install dependencies, run tests, and collect coverage
+        run: docker compose -f docker/buildkite/docker-compose.yaml run unit-test-test-service
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_ORG_TOKEN }}
+          slug: uber/cadence

build.gradle

@@ -287,6 +287,7 @@ task registerDomain(type:JavaExec) {
 test {
     dependsOn 'registerDomain'
     dependsOn 'licenseMain'
+    finalizedBy jacocoTestReport // report is always generated after tests run
     testLogging {
         events 'passed', 'skipped', 'failed'
         exceptionFormat 'full'
@@ -355,6 +356,7 @@ jacoco {
 }
 
 jacocoTestReport {
+    dependsOn test
     reports {
         xml.enabled = true // coveralls plugin depends on xml format report
         html.enabled = true

codecov.yml

@@ -0,0 +1,30 @@
+# Refs:
+# - https://docs.codecov.com/docs/common-recipe-list
+# - https://docs.codecov.com/docs/codecovyml-reference
+#
+# After making changes, run below command to validate
+# curl --data-binary @codecov.yml https://codecov.io/validate
+coverage:
+  range: 80...100
+  round: down
+  precision: 2
+  status:
+    project:                   # measuring the overall project coverage
+      default:                 # context, you can create multiple ones with custom titles
+        informational: true
+        target: 85%            # specify the target coverage for each commit status
+          #   option: "auto" (compare against parent commit or pull request base)
+        #   option: "X%" a static target percentage to hit
+        threshold: 0%          # allow the coverage drop by x% before marking as failure
+        if_ci_failed: ignore   # require the CI to pass before setting the status
+    patch:
+      default:
+        target: 85%            # specify the target coverage for each commit status
+          #   option: "auto" (compare against parent commit or pull request base)
+        #   option: "X%" a static target percentage to hit
+        threshold: 0%          # allow the coverage drop by x% before marking as failure
+comment:
+  layout: "header, files, footer"
+  hide_project_coverage: false
+codecov:
+  require_ci_to_pass: false