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>

files_test.go

@@ -0,0 +1,80 @@
+package gogpt_test
+
+import (
+	. "github.com/sashabaranov/go-gpt3"
+	"github.com/sashabaranov/go-gpt3/internal/test"
+
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestFileUpload(t *testing.T) {
+	server := test.NewTestServer()
+	server.RegisterHandler("/v1/files", handleCreateFile)
+	// create the test server
+	var err error
+	ts := server.OpenAITestServer()
+	ts.Start()
+	defer ts.Close()
+
+	client := NewClient(test.GetTestToken())
+	ctx := context.Background()
+	client.BaseURL = ts.URL + "/v1"
+
+	req := FileRequest{
+		FileName: "test.go",
+		FilePath: "api.go",
+		Purpose:  "fine-tune",
+	}
+	_, err = client.CreateFile(ctx, req)
+	if err != nil {
+		t.Fatalf("CreateFile error: %v", err)
+	}
+}
+
+// handleCreateFile Handles the images endpoint by the test server.
+func handleCreateFile(w http.ResponseWriter, r *http.Request) {
+	var err error
+	var resBytes []byte
+
+	// edits only accepts POST requests
+	if r.Method != "POST" {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+	err = r.ParseMultipartForm(1024 * 1024 * 1024)
+	if err != nil {
+		http.Error(w, "file is more than 1GB", http.StatusInternalServerError)
+		return
+	}
+
+	values := r.Form
+	var purpose string
+	for key, value := range values {
+		if key == "purpose" {
+			purpose = value[0]
+		}
+	}
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	var fileReq = File{
+		Bytes:     int(header.Size),
+		ID:        strconv.Itoa(int(time.Now().Unix())),
+		FileName:  header.Filename,
+		Purpose:   purpose,
+		CreatedAt: time.Now().Unix(),
+		Object:    "test-objecct",
+		Owner:     "test-owner",
+	}
+
+	resBytes, _ = json.Marshal(fileReq)
+	fmt.Fprint(w, string(resBytes))
+}