Add #expect_ran test helper

spec/support/command_helpers.rb

@@ -2,6 +2,13 @@ module CommandHelpers
   def commands
     CommandInterceptor.commands
   end
+
+  def expect_ran(*args)
+    expected_name, *expected_args = args
+    command = commands.last
+    expect(command.name).to eq(expected_name)
+    expect(command.args).to eq(expected_args) if expected_args.any?
+  end
 end
 
 RSpec.configure do |config|