tests: clear tab cache in global teardown

Library/Homebrew/test/formulary_test.rb

@@ -112,7 +112,6 @@ class FormularyFactoryTest < Homebrew::TestCase
     keg.uninstall
     formula.clear_cache
     formula.bottle.clear_cache
-    Tab.clear_cache
   end
 
   def test_load_from_contents

Library/Homebrew/test/support/helper/test_case.rb

@@ -14,6 +14,11 @@ module Homebrew
     TEST_SHA1   = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
     TEST_SHA256 = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
 
+    def teardown
+      Tab.clear_cache
+      super
+    end
+
     def formula(name = "formula_name", path = Formulary.core_path(name), spec = :stable, alias_path: nil, &block)
       @_f = Class.new(Formula, &block).new(name, path, spec, alias_path: alias_path)
     end