From 265deece56347844c13a9397c56c883c37417726 Mon Sep 17 00:00:00 2001
From: anahas-redhat <anahas@redhat.com>
Date: Thu, 12 Feb 2026 13:34:54 -0300
Subject: [PATCH] Add Codecov integration for unit test coverage tracking

- Add codecov.yml with project/patch coverage thresholds and ignore
  rules for vendor, upstream, generated, and test directories
- Add hack/codecov.sh script to run unit tests with coverage profiling
  and upload results to Codecov via CLI with cross-platform support
  (Linux and macOS)
- Add `make coverage` Makefile target as the entrypoint for running
  coverage locally and in CI
---
 Makefile        |  4 ++++
 codecov.yml     | 33 +++++++++++++++++++++++++++++++++
 hack/codecov.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 codecov.yml
 create mode 100755 hack/codecov.sh

diff --git a/Makefile b/Makefile
index 507f3f27c..d64de381c 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,10 @@ $(call verify-golang-versions,Dockerfile)
 
 $(call add-crd-gen,kueueoperator,./pkg/apis/kueueoperator/v1,./manifests/,./manifests/)
 
+.PHONY: coverage
+coverage: ## Run unit tests with coverage and upload to Codecov
+	hack/codecov.sh
+
 .PHONY: test-e2e
 test-e2e: ginkgo
 	${GINKGO} --keep-going --flake-attempts=3 --label-filter="!disruptive" -v ./test/e2e/...
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 000000000..421e3b906
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,33 @@
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        base: auto
+    patch:
+      default:
+        target: 80%
+        threshold: 1%
+        base: auto
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: false
+
+ignore:
+  - "vendor/"
+  - "upstream/"
+  - "bindata/"
+  - "**/*_test.go"
+  - "test/"
+  - "hack/"
+  - "pkg/generated/"
+  - "**/zz_generated.*.go"
+  - "cmd/"
+  - "bundle/"
+  - "manifests/"
+
+github_checks:
+  annotations: true
\ No newline at end of file
diff --git a/hack/codecov.sh b/hack/codecov.sh
new file mode 100755
index 000000000..72e23e39a
--- /dev/null
+++ b/hack/codecov.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "Running unit tests with coverage..."
+
+# Generate coverage report using the same test scope as current `make test`
+# This aligns with GO_TEST_PACKAGES=./pkg/... in the Makefile
+go test -mod=vendor -race -coverprofile=coverage.out -covermode=atomic ./pkg/...
+
+echo "Coverage report generated: coverage.out"
+
+# Only upload to Codecov if token is provided (for CI environments)
+if [[ -n "${CODECOV_TOKEN:-}" ]]; then
+    echo "Uploading coverage to Codecov..."
+
+    # Download Codecov CLI (more reliable than codecov-action in Prow)
+    # Detect platform and download appropriate binary
+    OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+    case "$OS" in
+        linux*)
+            CODECOV_URL="https://cli.codecov.io/latest/linux/codecov"
+            ;;
+        darwin*)
+            CODECOV_URL="https://cli.codecov.io/latest/macos/codecov"
+            ;;
+        *)
+            echo "Unsupported OS: $OS"
+            exit 1
+            ;;
+    esac
+
+    curl -Os "$CODECOV_URL"
+    chmod +x codecov
+
+    # Upload with unit-tests flag for proper categorization
+    ./codecov upload-process \
+        --token "${CODECOV_TOKEN}" \
+        --slug "openshift/kueue-operator" \
+        --flag unit-tests \
+        --file coverage.out \
+        --branch "${PULL_BASE_REF:-main}"
+
+    echo "Coverage uploaded successfully!"
+else
+    echo "CODECOV_TOKEN not provided, skipping upload (local development)"
+fi
\ No newline at end of file