task_helper: ensure that incrementing above 100% doesn’t raise an error

spec/lib/tasks/task_helper_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe ProgressReport, lib: true do
+  context 'when the count pass above 100%' do
+    let(:total) { 2 }
+
+    subject(:progress) { ProgressReport.new(total) }
+
+    it 'doesn’t raise errors' do
+      expect do
+        (total + 2).times { progress.inc }
+        progress.finish
+      end.not_to raise_error
+    end
+  end
+end