@@ -17,13 +17,22 @@ func TestProgress(t *testing.T) {

 		t.Fatalf("Expected empty string, got '%s'", jp.String())

 	}

+	expected := "     1 B"

 	jp2 := JSONProgress{Current: 1}

-	if jp2.String() != "     1 B" {

-		t.Fatalf("Expected '     1 B', got '%s'", jp2.String())

+	if jp2.String() != expected {

+		t.Fatalf("Expected %q, got %q", expected, jp2.String())

 	}

+	expected = "[=========================>                         ]     50 B/100 B"

 	jp3 := JSONProgress{Current: 50, Total: 100}

-	if jp3.String() != "[=========================>                         ]     50 B/100 B" {

-		t.Fatalf("Expected '[=========================>                         ]     50 B/100 B', got '%s'", jp3.String())

+	if jp3.String() != expected {

+		t.Fatalf("Expected %q, got %q", expected, jp3.String())

+	}

+

+	// this number can't be negetive gh#7136

+	expected = "[==============================================================>]     50 B/40 B"

+	jp4 := JSONProgress{Current: 50, Total: 40}

+	if jp4.String() != expected {

+		t.Fatalf("Expected %q, got %q", expected, jp4.String())

 	}

 }