Clear all tap caches before each test.

Library/Homebrew/test/cask/cask_loader/from_tap_loader_spec.rb

@@ -1,13 +1,13 @@
 # frozen_string_literal: true
 
 RSpec.describe Cask::CaskLoader::FromTapLoader do
+  let(:tap) { CoreCaskTap.instance }
   let(:cask_name) { "testball" }
   let(:cask_full_name) { "homebrew/cask/#{cask_name}" }
-  let(:cask_path) { CoreCaskTap.instance.cask_dir/"#{cask_name}.rb" }
+  let(:cask_path) { tap.cask_dir/"#{cask_name}.rb" }
 
   describe "#load" do
     before do
-      CoreCaskTap.instance.clear_cache
       cask_path.parent.mkpath
       cask_path.write <<~RUBY
         cask '#{cask_name}' do
@@ -25,7 +25,7 @@ RSpec.describe Cask::CaskLoader::FromTapLoader do
     end
 
     context "with sharded Cask directory" do
-      let(:cask_path) { CoreCaskTap.instance.cask_dir/cask_name[0]/"#{cask_name}.rb" }
+      let(:cask_path) { tap.cask_dir/cask_name[0]/"#{cask_name}.rb" }
 
       it "returns a Cask" do
         expect(described_class.new(cask_full_name).load(config: nil)).to be_a(Cask::Cask)

Library/Homebrew/test/cask/cask_loader_spec.rb

@@ -84,8 +84,6 @@ RSpec.describe Cask::CaskLoader, :cask do
 
         before do
           (old_tap.path/"tap_migrations.json").write tap_migrations.to_json
-          old_tap.clear_cache
-          default_tap.clear_cache
         end
 
         it "does not warn when loading the short token" do
@@ -112,7 +110,6 @@ RSpec.describe Cask::CaskLoader, :cask do
         #     (default_tap.path/"tap_migrations.json").write({
         #       token => old_tap.name,
         #     }.to_json)
-        #     default_tap.clear_cache
         #   end
         #
         #   it "stops recursing" do

Library/Homebrew/test/formulary_spec.rb

@@ -547,8 +547,6 @@ RSpec.describe Formulary do
         before do
           old_tap.path.mkpath
           (old_tap.path/"tap_migrations.json").write tap_migrations.to_json
-          old_tap.clear_cache
-          default_tap.clear_cache
         end
 
         it "does not warn when loading the short token" do
@@ -575,7 +573,6 @@ RSpec.describe Formulary do
         #     (default_tap.path/"tap_migrations.json").write({
         #       token => old_tap.name,
         #     }.to_json)
-        #     default_tap.clear_cache
         #   end
         #
         #   it "stops recursing" do

Library/Homebrew/test/spec_helper.rb

@@ -203,6 +203,7 @@ RSpec.configure do |config|
     Homebrew.raise_deprecation_exceptions = true
 
     Formulary.clear_cache
+    Tap.each(&:clear_cache)
     Tap.clear_cache
     DependencyCollector.clear_cache
     Formula.clear_cache
@@ -249,6 +250,9 @@ RSpec.configure do |config|
     rescue SystemExit => e
       example.example.set_exception(e)
     ensure
+      # This depends on `HOMEBREW_NO_INSTALL_FROM_API`.
+      Tap.each(&:clear_cache)
+
       ENV.replace(@__env)
       Context.current = Context::ContextStruct.new