Delete the "test" task, we only use rspec

Rakefile

@@ -3,7 +3,7 @@
 require "bundler"
 Bundler::GemHelper.install_tasks
 
-desc "Set a relevant database.yml for testing"
+desc "Write a database.yml for the specified RDBMS"
 task :prepare do
   ENV["DB"] ||= "sqlite"
   FileUtils.cp(
@@ -12,20 +12,6 @@ task :prepare do
   )
 end
 
-require "rake/testtask"
-desc "Run tests on PaperTrail with Test::Unit."
-Rake::TestTask.new(:test) do |t|
-  t.libs << "lib"
-  t.libs << "test"
-  t.pattern = "test/**/*_test.rb"
-  t.verbose = false
-
-  # Enabling ruby interpreter warnings (-w) is, sadly, impractical. There are
-  # too many noisy warnings that we have no control over, e.g. caused by libs we
-  # depend on.
-  t.warning = false
-end
-
 require "rspec/core/rake_task"
 desc "Run tests on PaperTrail with RSpec"
 task(:spec).clear
@@ -37,4 +23,4 @@ require "rubocop/rake_task"
 RuboCop::RakeTask.new
 
 desc "Default: run all available test suites"
-task default: %i[rubocop prepare test spec]
+task default: %i[rubocop prepare spec]