test(resume downloads): implement file download tc

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

pkg/downloader/uri_test.go

@@ -1,6 +1,13 @@
 package downloader_test
 
 import (
+	"crypto/rand"
+	"crypto/sha256"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+
 	. "github.com/mudler/LocalAI/pkg/downloader"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
@@ -40,8 +47,32 @@ var _ = Describe("Gallery API tests", func() {
 })
 
 var _ = Describe("Download Test", func() {
-	Context("URI", func() {
-		It("Resumes partially downloaded files")
-		It("It accurately updates progress")
+	Context("URI DownloadFile", func() {
+		It("fetches files from mock server", func() {
+			mockData := make([]byte, 20000)
+			_, err := rand.Read(mockData)
+			Expect(err).ToNot(HaveOccurred())
+
+			mockDataSha := sha256.New()
+			mockDataSha.Write(mockData)
+
+			mockServer := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(http.StatusOK)
+				w.Write(mockData)
+			}))
+			mockServer.EnableHTTP2 = true
+			mockServer.Start()
+			dir, err := os.Getwd()
+			filePath := dir + "/my_supercool_model"
+			Expect(err).NotTo(HaveOccurred())
+			uri := URI(mockServer.URL)
+			err = uri.DownloadFile(filePath, fmt.Sprintf("%x", mockDataSha.Sum(nil)), 1, 1, func(s1, s2, s3 string, f float64) {})
+			Expect(err).ToNot(HaveOccurred())
+			err = os.Remove(filePath) // cleanup, also checks existance of filePath`
+			Expect(err).ToNot(HaveOccurred())
+		})
+		// It("resumes partially downloaded files")
+		// It("it accurately updates progress")
+		// It("deletes partial file if after completion hash of downloaded file doesn't match hash of the file in the server")
 	})
 })