diff --git a/.gitignore b/.gitignore
index 4b42e327d1..54caa8def3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,11 +13,13 @@
 /Library/Homebrew/cask/bin
 /Library/Homebrew/cask/vendor
 /Library/Homebrew/cask/coverage
+/Library/Homebrew/cask/tmp
 /Library/Homebrew/test/.bundle
 /Library/Homebrew/test/bin
 /Library/Homebrew/test/vendor
 /Library/Homebrew/test/coverage
 /Library/Homebrew/test/fs_leak_log
+/Library/Homebrew/tmp
 /Library/LinkedKegs
 /Library/Locks
 /Library/PinnedKegs
diff --git a/Library/Homebrew/cask/cmd/brew-cask-tests.rb b/Library/Homebrew/cask/cmd/brew-cask-tests.rb
index 20f3430473..283b8516a9 100755
--- a/Library/Homebrew/cask/cmd/brew-cask-tests.rb
+++ b/Library/Homebrew/cask/cmd/brew-cask-tests.rb
@@ -19,8 +19,17 @@ repo_root.cd do
   ENV["TESTOPTS"] = "--seed=14830" if ENV["TRAVIS"]
   ENV["HOMEBREW_TESTS_COVERAGE"] = "1" if ARGV.flag?("--coverage")
 
-  run_tests "parallel_rspec", Dir["spec/**/*_spec.rb"] if rspec
-  run_tests "parallel_test", Dir["test/**/*_test.rb"] if minitest
+  if rspec
+    run_tests "parallel_rspec", Dir["spec/**/*_spec.rb"], %w[
+      --format progress
+      --format ParallelTests::RSpec::RuntimeLogger
+      --out tmp/parallel_runtime_rspec.log
+    ]
+  end
+
+  if minitest
+    run_tests "parallel_test", Dir["test/**/*_test.rb"]
+  end
 
   if ENV["CODECOV_TOKEN"]
     require "simplecov"
diff --git a/Library/Homebrew/cask/test/test_helper.rb b/Library/Homebrew/cask/test/test_helper.rb
index e4fd721703..bf557f66bc 100644
--- a/Library/Homebrew/cask/test/test_helper.rb
+++ b/Library/Homebrew/cask/test/test_helper.rb
@@ -39,6 +39,8 @@ require "minitest/autorun"
 require "minitest/reporters"
 Minitest::Reporters.use! Minitest::Reporters::DefaultReporter.new(color: true)
 
+require "parallel_tests/test/runtime_logger"
+
 # Force mocha to patch MiniTest since we have both loaded thanks to homebrew's testing_env
 require "mocha/api"
 require "mocha/integration/mini_test"
diff --git a/Library/Homebrew/test/testing_env.rb b/Library/Homebrew/test/testing_env.rb
index 396d92e13f..676badf82d 100644
--- a/Library/Homebrew/test/testing_env.rb
+++ b/Library/Homebrew/test/testing_env.rb
@@ -15,6 +15,7 @@ TEST_DIRECTORY = File.dirname(File.expand_path(__FILE__))
 begin
   require "rubygems"
   require "minitest/autorun"
+  require "parallel_tests/test/runtime_logger"
   require "mocha/setup"
 rescue LoadError
   abort "Run `bundle install` or install the mocha and minitest gems before running the tests"