handler: Add tests for empty metadata pairs

pkg/handler/head_test.go

@@ -27,7 +27,7 @@ func TestHead(t *testing.T) {
 				Size:   44,
 				MetaData: map[string]string{
 					"name":  "lunrjs.png",
-					"type": "image/png",
+					"empty": "",
 				},
 			}, nil),
 			lock.EXPECT().Unlock().Return(nil),
@@ -57,8 +57,8 @@ func TestHead(t *testing.T) {
 
 		// Since the order of a map is not guaranteed in Go, we need to be prepared
 		// for the case, that the order of the metadata may have been changed
-		if v := res.Header().Get("Upload-Metadata"); v != "name bHVucmpzLnBuZw==,type aW1hZ2UvcG5n" &&
-			v != "type aW1hZ2UvcG5n,name bHVucmpzLnBuZw==" {
+		if v := res.Header().Get("Upload-Metadata"); v != "name bHVucmpzLnBuZw==,empty " &&
+			v != "empty ,name bHVucmpzLnBuZw==" {
 			t.Errorf("Expected valid metadata (got '%s')", v)
 		}
 	})

pkg/handler/post_test.go

@@ -25,6 +25,7 @@ func TestPost(t *testing.T) {
 				MetaData: map[string]string{
 					"foo":   "hello",
 					"bar":   "world",
+					"empty": "",
 				},
 			}).Return(upload, nil),
 			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
@@ -33,6 +34,7 @@ func TestPost(t *testing.T) {
 				MetaData: map[string]string{
 					"foo":   "hello",
 					"bar":   "world",
+					"empty": "",
 				},
 			}, nil),
 		)
@@ -52,7 +54,7 @@ func TestPost(t *testing.T) {
 				"Tus-Resumable": "1.0.0",
 				"Upload-Length": "300",
 				// Invalid Base64-encoded values should be ignored
-				"Upload-Metadata": "foo aGVsbG8=, bar d29ybGQ=, hah INVALID",
+				"Upload-Metadata": "foo aGVsbG8=, bar d29ybGQ=, hah INVALID, empty",
 			},
 			Code: http.StatusCreated,
 			ResHeader: map[string]string{