Add the ability to mock the http client and a test.

upload/upload_test.go

@@ -0,0 +1,47 @@
+package upload
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"testing"
+	"os"
+	// 	"github.com/tardisx/discord-auto-upload/config"
+)
+
+// https://www.thegreatcodeadventure.com/mocking-http-requests-in-golang/
+type MockClient struct {
+	DoFunc func(req *http.Request) (*http.Response, error)
+}
+
+func (m *MockClient) Do(req *http.Request) (*http.Response, error) {
+	return m.DoFunc(req)
+}
+
+func DoGoodUpload(req *http.Request) (*http.Response, error) {
+	r := ioutil.NopCloser(bytes.NewReader([]byte(`{"id": "123456789012345678", "type": 0, "content": "", "channel_id": "849615269706203171", "author": {"bot": true, "id": "849615314274484224", "username": "abcdedf", "avatar": null, "discriminator": "0000"}, "attachments": [{"id": "851092588332449812", "filename": "dau480457962.png", "size": 859505, "url": "https://cdn.discordapp.com/attachments/849615269706203171/851092588332449812/dau480457962.png", "proxy_url": "https://media.discordapp.net/attachments/849615269706203171/851092588332449812/dau480457962.png", "width": 640, "height": 640, "content_type": "image/png"}], "embeds": [], "mentions": [], "mention_roles": [], "pinned": false, "mention_everyone": false, "tts": false, "timestamp": "2021-06-06T13:38:05.660000+00:00", "edited_timestamp": null, "flags": 0, "components": [], "webhook_id": "123456789012345678"}`)))
+	return &http.Response{
+		StatusCode: 200,
+		Body:       r,
+	}, nil
+}
+
+func TestSuccessfulUpload(t *testing.T) {
+	// create temporary file, processUpload requires that it exists, even though
+	// we will not really be uploading it here
+	f, _ := os.CreateTemp("", "dautest-upload-*")
+	defer os.Remove(f.Name())
+	u := Upload{webhookURL: "https://127.0.0.1/", originalFilename: f.Name()}
+	u.Client = &MockClient{DoFunc: DoGoodUpload}
+	err := u.processUpload()
+	if err != nil {
+		t.Errorf("error occured: %s", err)
+	}
+	if u.Width != 640 || u.Height != 640 {
+		t.Error("dimensions wrong")
+	}
+	if u.Url != "https://cdn.discordapp.com/attachments/849615269706203171/851092588332449812/dau480457962.png" {
+		t.Error("URL wrong")
+	}
+
+}