fix(ci): add coverage

.gitea/workflows/golang-tests.yaml

@@ -40,3 +40,18 @@ jobs:
     - env:
         GOPROXY: ${{ vars.GOPROXY }}
       run: make test/unit
+    - id: coverage
+      name: Check coverage
+      run: |
+        coverage="$(make test/coverage | grep total | awk '{ print substr($3, 1, length($3)-1); }')"
+        echo "total_coverage=$coverage" >> $GITHUB_OUTPUT
+        echo "Total coverage: ${coverage}%"
+    - name: Fail if coverage is to low
+      run: |
+        threshold=50
+        total_coverage=${{ steps.coverage.outputs.total_coverage }}
+
+        if (( ${total_coverage%.*} < ${threshold} )); then
+          echo "ERROR: Coverage (${total_coverage}%) is below the threshold (${threshold}%)." 1>&2
+          exit 1
+        fi

.gitignore

@@ -1,3 +1,3 @@
 prometheus-fail2ban-exporter
-coverage.txt
+coverage.*
 dist

Makefile

@@ -40,7 +40,7 @@ PHONY+=test/unit
 test/unit:
 	CGO_ENABLED=0 \
 	GOPROXY=$(shell go env GOPROXY) \
-		go test -v -p 1 -coverprofile=coverage.txt -covermode=count -timeout 1200s ./...
+		go test -v -p 1 -coverprofile=coverage.out -covermode=count -timeout 1200s ./...
 
 PHONY+=test/integration
 test/integration:
@@ -49,10 +49,10 @@ test/integration:
 		go test -v -p 1 -count=1 -timeout 1200s ./it/...
 
 PHONY+=test/coverage
-test/coverage: test/unit
+test/coverage:
 	CGO_ENABLED=0 \
 	GOPROXY=$(shell go env GOPROXY) \
-		go tool cover -html=coverage.txt
+		go tool cover -func=coverage.out
 
 # GOLANGCI-LINT
 # ==============================================================================