diff --git a/Library/Homebrew/cmd/test-bot.rb b/Library/Homebrew/cmd/test-bot.rb
index 6669a79711..8016f728f0 100644
--- a/Library/Homebrew/cmd/test-bot.rb
+++ b/Library/Homebrew/cmd/test-bot.rb
@@ -573,11 +573,15 @@ module Homebrew
     def homebrew
       @category = __method__
       return if @skip_homebrew
-      test "brew", "tests"
-      test "brew", "tests", "--no-compat" if @tap
-      readall_args = ["--aliases"]
-      readall_args << "--syntax" if MacOS.version >= :mavericks
-      test "brew", "readall", *readall_args
+      if @tap
+        test "brew", "readall", @tap
+      else
+        test "brew", "tests"
+        test "brew", "tests", "--no-compat"
+        readall_args = ["--aliases"]
+        readall_args << "--syntax" if MacOS.version >= :mavericks
+        test "brew", "readall", *readall_args
+      end
     end
 
     def cleanup_before