Do not omit leading zeros in duration_in_numbers helper

app/helpers/time_helper.rb

@@ -27,11 +27,7 @@ module TimeHelper
       minutes = (duration_in_seconds / 1.minute) % (1.hour / 1.minute)
       hours = duration_in_seconds / 1.hour
 
-      if hours == 0
-        "%02d:%02d" % [minutes, seconds]
-      else
-        "%02d:%02d:%02d" % [hours, minutes, seconds]
-      end
+      "%02d:%02d:%02d" % [hours, minutes, seconds]
     else
       time_format = duration_in_seconds < 1.hour ? "%M:%S" : "%H:%M:%S"
 

spec/helpers/time_helper_spec.rb

@@ -39,10 +39,10 @@ describe TimeHelper do
 
     context "with allow_overflow = true" do
       where(:duration, :formatted_string) do
-        0                              | "00:00"
-        1.second                       | "00:01"
-        42.seconds                     | "00:42"
-        2.minutes + 1.second           | "02:01"
+        0                              | "00:00:00"
+        1.second                       | "00:00:01"
+        42.seconds                     | "00:00:42"
+        2.minutes + 1.second           | "00:02:01"
         3.hours + 2.minutes + 1.second | "03:02:01"
         30.hours                       | "30:00:00"
       end