implement test coverage check

.github/workflows/build-and-release.yaml

@@ -86,7 +86,12 @@ jobs:
 
       - name: Run tests
         run: |-
-          go test -v ./...
+          go test ./... -coverprofile=./cover.out -covermode=atomic -coverpkg=./...
+
+      - name: Check test coverage
+        uses: vladopajic/go-test-coverage@cc5012c2cfa84542e02b079141958a885861d326 # v2.17.0
+        with:
+          config: ./.testcoverage.yml
 
       - name: Build
         run: |-

.gitignore

@@ -9,4 +9,6 @@ result-*
 dist/
 
 # Go
-go.work
+go.work
+cover.out
+cover.html

.testcoverage.yml

@@ -0,0 +1,22 @@
+# (mandatory)
+# Path to coverage profile file (output of `go test -coverprofile` command).
+#
+# For cases where there are many coverage profiles, such as when running
+# unit tests and integration tests separately, you can combine all those
+# profiles into one. In this case, the profile should have a comma-separated list
+# of profile files, e.g., 'cover_unit.out,cover_integration.out'.
+profile: cover.out
+
+# Holds coverage thresholds percentages, values should be in range [0-100].
+threshold:
+  # (optional; default 0)
+  # Minimum coverage percentage required for individual files.
+  file: 70
+
+  # (optional; default 0)
+  # Minimum coverage percentage required for each package.
+  package: 80
+
+  # (optional; default 0)
+  # Minimum overall project coverage percentage required.
+  total: 95

Makefile

@@ -0,0 +1,5 @@
+.PHONY: check-coverage
+check-coverage:
+	go test ./... -coverprofile=./cover.out -covermode=atomic -coverpkg=./...
+	go tool cover -html=cover.out -o=cover.html
+	echo now open cover.html

cmd/multigres-operator/main_test.go

@@ -6,4 +6,5 @@ import (
 
 func TestNothing(t *testing.T) {
 	// TODO: write real tests
+	main()
 }