chore: migrate last remaining tests of rspec

Rakefile

@@ -1,32 +1,25 @@
 # frozen_string_literal: true
 
 require 'bundler/gem_tasks'
-require 'rspec/core/rake_task'
 require 'rake/testtask'
 
-RSpec::Core::RakeTask.new(:spec) do |task|
-  task.pattern = 'spec/closure_tree/*_spec.rb'
-end
+task default: :test
 
-task default: %i[spec test]
+Rake::TestTask.new do |t|
+  t.libs.push 'lib'
+  t.libs.push 'test'
+  t.pattern = 'test/**/*_test.rb'
+  t.verbose = true
+end
 
-namespace :spec do
-  desc 'Run all spec variants'
+namespace :test do
+  desc 'Run all test variants'
   task :all do
     rake = 'bin/rake'
 
     [['', ''], ['db_prefix_', ''], ['', '_db_suffix'], %w[abc_ _123]].each do |prefix, suffix|
       env = "DB_PREFIX=#{prefix} DB_SUFFIX=#{suffix}"
-      raise unless system("#{rake} spec #{env}")
+      raise unless system("#{rake} test #{env}")
     end
   end
 end
-
-Rake::TestTask.new do |t|
-  t.libs.push 'lib'
-  t.libs.push 'test'
-  t.pattern = 'test/**/*_test.rb'
-  t.verbose = true
-end
-
-task default: 'spec:all'

closure_tree.gemspec

@@ -32,12 +32,9 @@ Gem::Specification.new do |gem|
 
   gem.add_development_dependency 'appraisal'
   gem.add_development_dependency 'database_cleaner'
-  gem.add_development_dependency 'generator_spec'
   gem.add_development_dependency 'parallel'
   gem.add_development_dependency 'minitest'
   gem.add_development_dependency 'minitest-reporters'
-  gem.add_development_dependency 'rspec-instafail'
-  gem.add_development_dependency 'rspec-rails'
   gem.add_development_dependency 'simplecov'
   gem.add_development_dependency 'timecop'
   # gem.add_development_dependency 'byebug'