diff --git a/Library/Homebrew/dev-cmd/test-bot.rb b/Library/Homebrew/dev-cmd/test-bot.rb
index 2c9a77bcfb..d2c5b317b5 100644
--- a/Library/Homebrew/dev-cmd/test-bot.rb
+++ b/Library/Homebrew/dev-cmd/test-bot.rb
@@ -668,6 +668,10 @@ module Homebrew
                               *tests_args
         test "brew", "tests", "--no-compat"
         test "brew", "readall", "--syntax"
+        # test update from origin/master to current commit.
+        test "brew", "update-test"
+        # test no-op update from current commit (to current commit, a no-op).
+        test "brew", "update-test", "--commit=HEAD"
       else
         test "brew", "readall", "--aliases", @tap.name
       end