Add gitlab server mock to serve json testdata

test/mock/gitlab/server.go

@@ -0,0 +1,44 @@
+package gitlab_mock
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"path"
+	"strings"
+)
+
+type FileHandler struct {
+	Root http.FileSystem
+}
+
+func (f *FileHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	upath := r.URL.Path
+	if !strings.HasPrefix(upath, "/") {
+		upath = "/" + upath
+		r.URL.Path = upath
+	}
+	serveFile(w, r, f.Root, path.Clean(upath))
+}
+
+func serveFile(w http.ResponseWriter, r *http.Request, fs http.FileSystem, name string) {
+	f, err := fs.Open(name + ".json")
+	if err != nil {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprintln(w, fmt.Sprintf(`{"message": "%s"}`, err))
+		return
+	}
+	defer f.Close()
+
+	var data interface{}
+	if err := json.NewDecoder(f).Decode(&data); err != nil {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprintln(w, fmt.Sprintf(`{"message": "%s"}`, err))
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(data)
+}