package tui

import "testing"

func TestDownloadProgressFraction(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name           string
		written, total int64
		want           float64
	}{
		{name: "empty", want: 0},
		{name: "negative written", written: -1, total: 100, want: 0},
		{name: "half", written: 50, total: 100, want: 0.5},
		{name: "complete", written: 100, total: 100, want: 1},
		{name: "clamps overflow", written: 150, total: 100, want: 1},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			if got := downloadProgressFraction(tt.written, tt.total); got != tt.want {
				t.Fatalf("downloadProgressFraction(%d, %d) = %v, want %v", tt.written, tt.total, got, tt.want)
			}
		})
	}
}