Function addParentWithDownloadingChildren

cmd/display/tty_test.go:609–635

addParentWithDownloadingChildren wires a parent task with N children whose non-zero totals trigger the " X.XMB / Y.YMB" suffix in prepareLineData's progress field. Used by the multi-render regression test below.

(w *ttyWriter, parentID string, children int, totalBytes int64)

// non-zero totals trigger the " X.XMB / Y.YMB" suffix in prepareLineData's
// progress field. Used by the multi-render regression test below.
func addParentWithDownloadingChildren(w *ttyWriter, parentID string, children int, totalBytes int64) {
	parent := &task{
		ID:        parentID,
		parents:   make(map[string]struct{}),
		startTime: time.Now(),
		text:      "Pulling",
		status:    api.Working,
		spinner:   NewSpinner(),
	}
	w.tasks[parent.ID] = parent
	w.ids = append(w.ids, parent.ID)
	for i := range children {
		c := &task{
			ID:        fmt.Sprintf("%s/layer%d", parentID, i),
			parents:   map[string]struct{}{parent.ID: {}},
			startTime: time.Now(),
			text:      "Downloading",
			status:    api.Working,
			total:     totalBytes / int64(children),
			current:   totalBytes / int64(children) / 2,
			percent:   50,
			spinner:   NewSpinner(),
		}
		w.tasks[c.ID] = c
		w.ids = append(w.ids, c.ID)
	}
}

// TestPrintWithDimensions_MultipleRendersFit verifies the cross-render aspect
// of docker/compose#13595: even a single overflowing line desyncs the cursor