From f630dcd2a07f4dcf3f6426baf6b45c5ef1123a9f Mon Sep 17 00:00:00 2001
From: Sung Yoon Whang <sungyoon@uber.com>
Date: Tue, 30 Jun 2026 15:47:06 -0700
Subject: [PATCH] CI: add coverage step

This adds coverage step in the CI by leveraging codecov.

Right now the config isn't going to block on any specific numbers yet,
but it should at least allow us to collect coverage on every PR so we
know when we're not adding appropriate tests.
---
 .codecov.yml             | 16 ++++++++++++++++
 .github/workflows/ci.yml | 26 ++++++++++++++++++++++++++
 .gitignore               |  3 +++
 Makefile                 |  8 +++++++-
 4 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 .codecov.yml

diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 0000000..7818984
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,16 @@
+coverage:
+  range: 80..100
+  round: down
+  precision: 2
+
+  status:
+    project:
+      default:
+        enabled: yes
+        target: auto
+        if_not_found: success
+        if_ci_failed: error
+ignore:
+  - tangopb/
+  - tangopb/tangopbmock/
+  - example/
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 218a623..882145c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,6 +55,31 @@ jobs:
           echo "=== Test logs ==="
           find . -name "test.log" -exec echo "--- {} ---" \; -exec cat {} \; || echo "No test logs found"
 
+  coverage:
+    name: Coverage
+    if: ${{ github.event_name != 'pull_request' || github.event.pull_request.draft == false }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run tests with coverage
+        run: make cover
+
+      - name: Upload coverage to codecov.io
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6
+        with:
+          file: cover.out
+          verbose: true
+
   dependencies:
     name: Dependencies
     if: ${{ github.event_name != 'pull_request' || github.event.pull_request.draft == false }}
@@ -199,6 +224,7 @@ jobs:
     runs-on: ubuntu-latest
     needs:
       - build-and-test
+      - coverage
       - dependencies
       - lint
       - workflow-security
diff --git a/.gitignore b/.gitignore
index f0a0a23..8b8aa74 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,6 @@ tools/gopackagesdriver.sh
 
 # Built binaries
 bin/
+
+# Coverage output
+cover.out
diff --git a/Makefile b/Makefile
index 6c88155..4d1a3c5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: build test proto gazelle clean clean-proto run-server run-client-get-graph run-client-changed-targets help
+.PHONY: build cover test proto gazelle clean clean-proto run-server run-client-get-graph run-client-changed-targets help
 
 # Bazel wrapper
 BAZEL = ./tools/bazel
@@ -29,6 +29,12 @@ gazelle:
 	@$(BAZEL) run //:gazelle
 	@echo "BUILD files updated!"
 
+# Run tests with coverage and generate cover.out
+cover: ## Run tests with coverage
+	@echo "Running tests with coverage..."
+	@go test -race -coverprofile=cover.out -coverpkg=./... ./...
+	@echo "Coverage report written to cover.out"
+
 # Clean generated files and binaries
 clean:
 	@echo "Cleaning with Bazel..."