Remove tests that treat `Transport` as a singleton

spec/jobs/send_factory_reset_job_spec.rb

@@ -1,13 +0,0 @@
-require 'spec_helper'
-
-RSpec.describe SendFactoryResetJob, type: :job do
-  let(:device) { FactoryBot.create(:device) }
-
-  it 'sends a factory_reset RPC' do
-    dbl = double("fake transport layer")
-    payl = SendFactoryResetJob.rpc_payload(device)
-    expect(dbl)
-      .to receive(:amqp_send).with(payl.to_json, device.id, "from_clients")
-    SendFactoryResetJob.new.perform(device, dbl)
-  end
-end

spec/models/device_spec.rb

@@ -25,11 +25,4 @@ describe Device do
     device.timezone = "America/Chicago"
     expect([-5, -6, -7]).to include device.tz_offset_hrs # Remember DST!
   end
-
-  it 'uses `tell` to send device messages' do
-    dbl = double("fake transport layer")
-    expect(dbl).to receive(:amqp_send)
-    result = device.tell("Hello!", dbl)
-    expect(result.message).to eq("Hello!")
-  end
 end