add coverage make target; add unit test for remapper

Makefile

@@ -13,6 +13,10 @@ test:
 test-cleanup:
 	go clean -testcache
 
+.PHONY: test-coverage
+test-coverage:
+	go test -cover -coverprofile=coverage.out ./...; go tool cover -html=coverage.out -o coverage.html; rm coverage.out
+
 .PHONY: publish
 publish:
 	GOPROXY=proxy.golang.org go list -m github.com/KarnerTh/xogs@$(GIT_TAG)

internal/aggregator/remapper_test.go

@@ -0,0 +1,21 @@
+package aggregator
+
+import (
+	"testing"
+
+	"github.com/KarnerTh/xogs/internal/config"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRemapper(t *testing.T) {
+	// Arrange
+	data := map[string]string{"before": "testValue"}
+
+	// Act
+	remap(data, "before", config.Remapper{TargetKey: "after"})
+
+	// Assert
+	assert.Contains(t, data, "after")
+	assert.NotContains(t, data, "before")
+	assert.Equal(t, "testValue", data["after"])
+}