Modify the test module, add the file upload test, and add the image edit api (#63)

* Modify the test module, add the file upload test, and add the image editing api

* fix golangci-lint

* fix golangci-lint

* Static file deletion, file directory name modification

* fix

* test-server-related logic encapsulated in a single tidy
 struct

---------

Co-authored-by: julian_huang <julian.huang@yuansuan.com>

internal/test/server.go

@@ -0,0 +1,46 @@
+package test
+
+import (
+	"log"
+	"net/http"
+	"net/http/httptest"
+)
+
+const testAPI = "this-is-my-secure-token-do-not-steal!!"
+
+func GetTestToken() string {
+	return testAPI
+}
+
+type ServerTest struct {
+	handlers map[string]handler
+}
+type handler func(w http.ResponseWriter, r *http.Request)
+
+func NewTestServer() *ServerTest {
+	return &ServerTest{handlers: make(map[string]handler)}
+}
+
+func (ts *ServerTest) RegisterHandler(path string, handler handler) {
+	ts.handlers[path] = handler
+}
+
+// OpenAITestServer Creates a mocked OpenAI server which can pretend to handle requests during testing.
+func (ts *ServerTest) OpenAITestServer() *httptest.Server {
+	return httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("received request at path %q\n", r.URL.Path)
+
+		// check auth
+		if r.Header.Get("Authorization") != "Bearer "+GetTestToken() {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+
+		handlerCall, ok := ts.handlers[r.URL.Path]
+		if !ok {
+			http.Error(w, "the resource path doesn't exist", http.StatusNotFound)
+			return
+		}
+		handlerCall(w, r)
+	}))
+}