Use array of constants to set up test directories.

Library/Homebrew/test/Gemfile

@@ -2,6 +2,7 @@ source "https://rubygems.org"
 
 gem "mocha"
 gem "minitest"
+gem "minitest-reporters"
 gem "parallel_tests"
 
 group :coverage do

Library/Homebrew/test/Gemfile.lock

@@ -1,6 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    ansi (1.5.0)
+    builder (3.2.3)
     codecov (0.1.9)
       json
       simplecov
@@ -9,11 +11,17 @@ GEM
     json (2.0.3)
     metaclass (0.0.4)
     minitest (5.10.1)
+    minitest-reporters (1.1.14)
+      ansi
+      builder
+      minitest (>= 5.0)
+      ruby-progressbar
     mocha (1.2.1)
       metaclass (~> 0.0.1)
     parallel (1.10.0)
     parallel_tests (2.13.0)
       parallel
+    ruby-progressbar (1.8.1)
     simplecov (0.13.0)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
@@ -27,6 +35,7 @@ PLATFORMS
 DEPENDENCIES
   codecov
   minitest
+  minitest-reporters
   mocha
   parallel_tests
   simplecov

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

@@ -12,6 +12,20 @@ module Homebrew
     TEST_SHA1   = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
     TEST_SHA256 = "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef".freeze
 
+    def before_setup
+      [
+        HOMEBREW_LIBRARY/"Taps/homebrew/homebrew-core/Formula",
+        HOMEBREW_CACHE,
+        HOMEBREW_CACHE_FORMULA,
+        HOMEBREW_LOCK_DIR,
+        HOMEBREW_CELLAR,
+        HOMEBREW_LOGS,
+        HOMEBREW_TEMP,
+      ].each(&:mkpath)
+
+      super
+    end
+
     def setup
       super
 
@@ -23,6 +37,10 @@ module Homebrew
       ARGV.replace(@__argv)
       ENV.replace(@__env)
 
+      super
+    end
+
+    def after_teardown
       Tab.clear_cache
 
       coretap = CoreTap.new

Library/Homebrew/test/testing_env.rb

@@ -1,16 +1,14 @@
-$:.unshift File.expand_path("../..", __FILE__)
-$:.unshift File.expand_path("../support/lib", __FILE__)
+$LOAD_PATH.unshift(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew"))
+$LOAD_PATH.unshift(File.expand_path("#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/test/support/lib"))
 
 require "simplecov" if ENV["HOMEBREW_TESTS_COVERAGE"]
 require "global"
 require "formulary"
 
-# Test environment setup
-(HOMEBREW_LIBRARY/"Taps/homebrew/homebrew-core/Formula").mkpath
-%w[cache formula_cache locks cellar logs temp].each { |d| HOMEBREW_PREFIX.parent.join(d).mkpath }
-
 begin
   require "minitest/autorun"
+  require "minitest/reporters"
+  Minitest::Reporters.use! Minitest::Reporters::DefaultReporter.new(color: true)
   require "parallel_tests/test/runtime_logger"
   require "mocha/setup"
 rescue LoadError