Update checker returns a boolean if callback was executed or not.

activesupport/lib/active_support/file_update_checker.rb

@@ -32,6 +32,9 @@ module ActiveSupport
       if @last_update_at != current_update_at
         @last_update_at = current_update_at
         @block.call
+        true
+      else
+        false
       end
     end
   end

activesupport/test/file_update_checker_test.rb

@@ -42,19 +42,18 @@ module FileUpdateCheckerSuite
 
   def test_should_not_invoke_the_block_if_no_file_has_changed
     i = 0
-    checker = ActiveSupport::FileUpdateChecker.new(args){ i += 1 }
-    5.times { checker.execute_if_updated }
-    assert_equal 1, i
+    checker = ActiveSupport::FileUpdateChecker.new(args, true){ i += 1 }
+    5.times { assert !checker.execute_if_updated }
+    assert_equal 0, i
   end
 
   def test_should_invoke_the_block_if_a_file_has_changed
     i = 0
-    checker = ActiveSupport::FileUpdateChecker.new(args){ i += 1 }
-    checker.execute_if_updated
+    checker = ActiveSupport::FileUpdateChecker.new(args, true){ i += 1 }
     sleep(1)
     FileUtils.touch(FILES)
-    checker.execute_if_updated
-    assert_equal 2, i
+    assert checker.execute_if_updated
+    assert_equal 1, i
   end
 end