Test: Add test for api/preview

internal/api/preview_test.go

@@ -0,0 +1,17 @@
+package api
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetPreview(t *testing.T) {
+	t.Run("invalid type", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		GetPreview(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/preview")
+		assert.Equal(t, http.StatusOK, result.Code)
+	})
+}