Add rake task for rspec

Rakefile

@@ -8,4 +8,4 @@ Dir.glob(File.join(__dir__ || Dir.pwd, "tasks", "*.rake")) { |f| import f }
 desc "Run checks"
 task :check
 
-task default: [:test, :check]
+task default: [:check, :spec, :test]

tasks/rspec.rake

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# @type self: Rake::DSL
+
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec) do |t, args|
+  t.pattern = "spec/**/*_spec.rb"
+  t.rspec_opts = args.to_a.join(" ")
+end