added endpoint to remove nilms

app/adapters/db_adapter.rb

@@ -21,7 +21,12 @@ class DbAdapter
     rescue
       return nil
     end
-
+    # if the site exists but is not a nilm...
+    required_keys = %w(size other free reserved)
+    unless info.respond_to?(:has_key?) &&
+           required_keys.all? { |s| info.key? s }
+      return nil
+    end
     {
       version: version,
       size_db: info['size'],
@@ -38,7 +43,10 @@ class DbAdapter
     rescue
       return nil
     end
-
+    #if the url exists but is not a nilm...
+    unless resp.parsed_response.respond_to?(:map)
+      return nil
+    end
     resp.parsed_response.map do |entry|
       metadata = if entry[0].match(UpdateStream.decimation_tag).nil?
                    __get_metadata(entry[0])
@@ -85,7 +93,7 @@ class DbAdapter
       return { error: true, msg: 'cannot contact NilmDB server' }
     end
     unless response.success?
-      Rails.logger.warn("#{@url}: update_metadata(#{path})"+
+      Rails.logger.warn("#{@url}: update_metadata(#{path})"\
                         " => #{response.code}:#{response.body}")
       return { error: true, msg: "error updating #{path} metadata" }
     end

app/controllers/dbs_controller.rb

@@ -13,16 +13,9 @@ class DbsController < ApplicationController
   # PATCH/PUT /dbs/1.json
   def update
     @service = StubService.new
-    prev_url = @db.url
     if @db.update_attributes(db_params)
-      if prev_url != @db.url || params[:refresh]
-        # refresh the database
-        @service = refresh
-        render status: @service.success? ? :ok : :unprocessable_entity
-      else
-        @service.add_notice('database updated')
-        render status: :ok
-      end
+      @service.add_notice('Database updated')
+      render status: :ok
     else
       @service.errors = @db.errors.full_messages
       render status: :unprocessable_entity
@@ -31,14 +24,14 @@ class DbsController < ApplicationController
 
   private
 
-  def refresh
-    adapter = DbAdapter.new(@db.url)
-    service = UpdateDb.new(db: @db)
-    service.run(adapter.dbinfo, adapter.schema)
-  end
+  #def refresh
+  #    adapter = DbAdapter.new(@db.url)
+  #  service = UpdateDb.new(db: @db)
+  #  service.run(adapter.dbinfo, adapter.schema)
+  #end
 
   def db_params
-    params.permit(:url, :max_points_per_plot)
+    params.permit(:max_points_per_plot)
   end
 
   def set_db

app/controllers/nilms_controller.rb

@@ -3,20 +3,26 @@
 # controller for NILM objects
 class NilmsController < ApplicationController
   before_action :authenticate_user!
-  before_action :set_nilm, only: [:show, :update]
+  before_action :set_nilm, only: [:update, :refresh, :destroy]
   before_action :authorize_viewer, only: [:show]
-  before_action :authorize_owner, only: [:update]
+  before_action :authorize_owner, only: [:update, :refresh]
+  before_action :authorize_admin, only: [:destroy]
 
-  # GET /nilms
   # GET /nilms.json
   def index
     @nilms = current_user.retrieve_nilms_by_permission
   end
 
-  # GET /nilms/1
-  # GET /nilms/1.json
-  def show
-    # renders nilms/show
+
+  # POST /nilms.json
+  def create
+    @service = CreateNilm.new
+    @service.run(name: nilm_params[:name],
+                 url: nilm_params[:url],
+                 description: nilm_params[:description],
+                 owner: current_user)
+    @nilm = @service.nilm
+    render :show, status: @service.success? ? :ok : :unprocessable_entity
   end
 
   # PATCH/PUT /nilms/1
@@ -24,14 +30,28 @@ class NilmsController < ApplicationController
   def update
     @service = StubService.new
     if @nilm.update(nilm_params)
-      @service.add_notice('NILM Updated')
-      render status: :ok
+      @service.add_notice('Installation Updated')
+      render :show, status: :ok
     else
       @service.errors = @nilm.errors.full_messages
-      render status: :unprocessable_entity
+      render :show, status: :unprocessable_entity
     end
   end
 
+  # PATCH/PUT /nilms/1/refresh.json
+  def refresh
+    @service = UpdateNilm.new()
+    @service.run(@nilm)
+    render status: @service.success? ? :ok : :unprocessable_entity
+  end
+
+  # DELETE /nilms/1.json
+  def destroy
+    @service = StubService.new
+    @nilm.destroy
+    @service.set_notice('removed nilm')
+  end
+
 
   private
     # Use callbacks to share common setup or constraints between actions.
@@ -45,6 +65,9 @@ class NilmsController < ApplicationController
     end
 
     #authorization based on nilms
+    def authorize_admin
+      head :unauthorized  unless current_user.admins_nilm?(@nilm)
+    end
     def authorize_owner
       head :unauthorized  unless current_user.owns_nilm?(@nilm)
     end

app/models/db.rb

@@ -18,8 +18,8 @@ class Db < ApplicationRecord
     return super unless super.nil? || super.empty?
     # no default URL if no parent NILM available
     return '--error, no parent NILM--' if nilm.nil?
-    # return the default URL"
-    "#{nilm.url}/nilmdb"
+    # return the default URL
+    nilm.url
   end
 
   def self.json_keys

app/models/nilm.rb

@@ -10,8 +10,8 @@ class Nilm < ApplicationRecord
   has_many :user_groups, through: :permissions
 
   #---Validations-----
-  validates :name, presence: true
-
+  validates :name, presence: true, uniqueness: true
+  validates :url, presence: true, uniqueness: true
 
   def self.json_keys
     [:id, :name, :description, :url]

app/services/nilm/create_nilm.rb

@@ -2,22 +2,42 @@
 
 # Agent class for DbFolders
 class CreateNilm
-  attr_accessor :errors, :warnings, :nilm
+  include ServiceStatus
+  attr_reader :nilm
 
-  def initialize
-    @errors = []
-    @warnings = []
-  end
 
-  def run(name:, url:, description: '', db_url: '')
-    # create the NILM object
-    @nilm = Nilm.new(name: name, url: url,
-                     description: description)
-    @nilm.save
+
+  def run(name:, url:, owner:, description:'')
+    # note: url should be NilmDB url
+    @nilm = Nilm.new(name: name,
+                     description: description,
+                     url: url)
+    unless @nilm.valid?
+      add_errors(@nilm.errors.full_messages)
+      return self
+    end
+
     # create the database object and update it
-    db = Db.create(nilm: @nilm, url: db_url)
+    # pass NILM url onto database since we are using
+    # a single endpoint (eventually this will be joule)
+    db = Db.new(nilm: @nilm, url: url)
+    unless db.valid?
+      add_errors(db.errors.full_messages.map{|msg| "Database: #{msg}"})
+      return self
+    end
+    #everything is valid, save the objects
+    nilm.save
+    db.save
+    #give the owner 'admin' permissions on the nilm
+    Permission.create(user: owner, nilm: nilm, role: 'admin')
+    #update the database
     service = UpdateDb.new(db: db)
     adapter = DbAdapter.new(db.url)
     service.run(adapter.dbinfo, adapter.schema)
+    #errors on the database update are warnings on this service
+    #because we can still add the NILM, it will just be offline
+    add_warnings(service.errors + service.warnings)
+    add_notice('Created installation')
+    self
   end
 end

app/services/nilm/update_nilm.rb

+# frozen_string_literal: true
+
+# Handles refreshing NILM's
+class UpdateNilm
+  include ServiceStatus
+
+  def run(nilm)
+    if nilm.db.nil?
+      add_error('no associated db object')
+      return self
+    end
+    adapter = DbAdapter.new(nilm.url)
+    service = UpdateDb.new(db: nilm.db)
+    absorb_status(
+      service.run(adapter.dbinfo, adapter.schema)
+    )
+    self
+  end
+end

app/services/service_status.rb

@@ -45,7 +45,7 @@ module ServiceStatus
   def add_errors(messages)
     messages.each{|m| self.add_error(m)}
   end
-  
+
   def errors?
     !@errors.empty?
   end
@@ -56,6 +56,10 @@ module ServiceStatus
     @warnings << String(message)
   end
 
+  def add_warnings(messages)
+    messages.each{|m| self.add_warning(m)}
+  end
+
   def warnings?
     !@warnings.empty?
   end

app/views/dbs/_db.json.jbuilder

 json.extract! db, *Db.json_keys
 
-json.contents do
-  root = db.root_folder
-  json.extract! root, *DbFolder.json_keys
+if(db.root_folder != nil)
+  json.contents do
+    root = db.root_folder
+    json.extract! root, *DbFolder.json_keys
 
-  json.subfolders(root.subfolders) do |folder|
-    json.extract! folder, *DbFolder.json_keys
-  end
+    json.subfolders(root.subfolders) do |folder|
+      json.extract! folder, *DbFolder.json_keys
+    end
 
-  json.streams(root.db_streams) do |stream|
-    json.extract! stream, *DbStream.json_keys
-    json.elements(stream.db_elements) do |element|
-      json.extract! element, *DbElement.json_keys
+    json.streams(root.db_streams) do |stream|
+      json.extract! stream, *DbStream.json_keys
+      json.elements(stream.db_elements) do |element|
+        json.extract! element, *DbElement.json_keys
+      end
     end
   end
-
 end

app/views/nilms/_nilm.json.jbuilder

-json.extract! nilm, *Nilm.json_keys
-json.db_id nilm.db.id
-json.available nilm.db.available

app/views/nilms/update.json.jbuilder → app/views/nilms/destroy.json.jbuilder

 json.data do
-  json.partial! "nilms/nilm", nilm: @nilm
+  # nothing here
 end
 
 json.partial! "helpers/messages", service: @service

app/views/nilms/refresh.json.jbuilder

+# frozen_string_literal: true
+json.data do
+  json.extract! @nilm, *Nilm.json_keys
+  unless @nilm.db.nil?
+    json.db_id @nilm.db.id
+    json.available @nilm.db.available
+    #show the database which was refreshed
+    json.db do
+      json.partial! 'dbs/db', db: @nilm.db
+    end
+  end
+end
+json.partial! 'helpers/messages', service: @service

app/views/nilms/show.json.jbuilder

-json.partial! "nilms/nilm", nilm: @nilm
+# frozen_string_literal: true
+json.data do
+  json.extract! @nilm, *Nilm.json_keys
+  unless @nilm.db.nil?
+    json.db_id @nilm.db.id
+    json.available @nilm.db.available
+  end
+end
+json.partial! 'helpers/messages', service: @service

config/routes.rb

 Rails.application.routes.draw do
 
-  resources :nilms, only: [:index, :show, :update]
+  resources :nilms, only: [:index, :create, :update, :destroy] do
+    member do
+      put 'refresh'
+    end
+  end
   resources :dbs, only: [:show, :update]
   resources :db_folders, only: [:show, :update]
   resources :db_streams, only: [:update]

db/seeds.rb

@@ -37,9 +37,8 @@ lab = FactoryGirl.create(:user_group, name: 'Lab', owner: john, members: [steve,
 
 # create real nilms
 nc = CreateNilm.new
-nc.run(name: 'Local', url: 'http://localhost:8080')
+nc.run(name: 'Local', url: 'http://localhost:8080', owner: john)
 home = nc.nilm
-FactoryGirl.create(:permission, nilm: home, user: john, role: 'admin')
 FactoryGirl.create(:permission, nilm: home, user_group: donnals, role: 'owner')
 FactoryGirl.create(:permission, nilm: home, user: steve, role: 'viewer')
 

spec/controllers/db_folders_controller_spec.rb

@@ -2,8 +2,8 @@
 require 'rails_helper'
 
 RSpec.describe DbFoldersController, type: :request do
-  let(:john) { create(:user, first_name: 'John') }
-  let(:steve) { create(:user, first_name: 'Steve') }
+  let(:john) { create(:confirmed_user, first_name: 'John') }
+  let(:steve) { create(:confirmed_user, first_name: 'Steve') }
   let(:john_nilm) { create(:nilm, name: "John's NILM", admins: [john]) }
   let(:john_folder) do
     create(:db_folder, name: 'John Folder',
@@ -20,10 +20,6 @@ RSpec.describe DbFoldersController, type: :request do
   # index action does not exist
 
   describe 'GET show' do
-    before do
-      john.confirm
-      steve.confirm
-    end
     context 'with any permissions' do
       it 'returns the db_folder as json' do
         # john has some permission on all 3 nilms
@@ -58,8 +54,6 @@ RSpec.describe DbFoldersController, type: :request do
 
   describe 'PUT update' do
     before do
-      john.confirm
-      steve.confirm
       @mock_adapter = double(DbAdapter) # MockDbAdapter.new #instance_double(DbAdapter)
       @db_success = { error: false, msg: 'success' }
       @db_failure = { error: true, msg: 'dberror' }
@@ -67,7 +61,6 @@ RSpec.describe DbFoldersController, type: :request do
     end
 
     context 'with owner permissions' do
-
       it 'updates nilmdb and local database' do
         @auth_headers = john.create_new_auth_token
         expect(@mock_adapter).to receive(:set_folder_metadata)

spec/controllers/dbs_controller_spec.rb

@@ -11,7 +11,6 @@ RSpec.describe DbsController, type: :request do
   let(:hidden_nilm) { create(:nilm, name: "Private NILM", owners: [steve])}
 
   # index action does not exist
-
   describe 'GET show' do
     before do
       john.confirm
@@ -56,23 +55,6 @@ RSpec.describe DbsController, type: :request do
       steve.confirm
     end
     context 'with owner permissions' do
-      it 'refreshes db if URL is changed or refresh paramter is set' do
-        # TODO: this is a mess, figure out how instance doubles work
-        mock_adapter = spy #instance_double(DbAdapter)
-        allow(DbAdapter).to receive(:new).and_return(mock_adapter)
-        mock_service =  spy #---_ this line is to provide dummy messages
-        allow(mock_service).to receive(:run).and_return(StubService.new)
-        allow(UpdateDb).to receive(:new).and_return(mock_service)
-
-        @auth_headers = john.create_new_auth_token
-        put "/dbs/#{john_nilm.db.id}.json",
-            params: {url: 'http://new/url'},
-            headers: @auth_headers
-        expect(response.status).to eq(200)
-        expect(mock_service).to have_received(:run)
-        # service is stubbed so message is empty
-        # expect(response).to have_notice_message
-      end
       it 'returns 422 on invalid parameters' do
         # max points must be a positive number
         @auth_headers = john.create_new_auth_token
@@ -86,14 +68,14 @@ RSpec.describe DbsController, type: :request do
       it 'only allows configurable parameters to be changed' do
         # should ignore size and accept max_points
         @auth_headers = john.create_new_auth_token
-        size = john_nilm.db.size_db
+        url = john_nilm.db.url
         num_points = john_nilm.db.max_points_per_plot
         put "/dbs/#{john_nilm.db.id}.json",
-            params: {max_points_per_plot: num_points+10, size_db: size+10},
+            params: {max_points_per_plot: num_points+10, url: 'different'},
             headers: @auth_headers
         expect(response.status).to eq(200)
         expect(response).to have_notice_message()
-        expect(john_nilm.db.reload.size_db).to eq(size)
+        expect(john_nilm.db.reload.url).to eq(url)
         expect(john_nilm.db.max_points_per_plot).to eq(num_points+10)
       end
     end

spec/controllers/nilms_controller_spec.rb

@@ -3,18 +3,15 @@
 require 'rails_helper'
 
 RSpec.describe NilmsController, type: :request do
-  let(:john) { create(:user, first_name: 'John') }
-  let(:steve) { create(:user, first_name: 'Steve') }
-  let(:john_nilm) { create(:nilm, name: "John's NILM", admins: [john]) }
+  let(:john) { create(:confirmed_user, first_name: 'John') }
+  let(:nicky) {create(:confirmed_user, first_name: 'Nicky')}
+  let(:steve) { create(:confirmed_user, first_name: 'Steve') }
+  let(:john_nilm) { create(:nilm, name: "John's NILM", admins: [john], owners: [nicky]) }
   let(:lab_nilm) { create(:nilm, name: 'Lab NILM', owners: [john]) }
   let(:pete_nilm) { create(:nilm, name: "Pete's NILM", viewers: [john])}
   let(:hidden_nilm) { create(:nilm, name: "Private NILM", owners: [steve])}
 
   describe 'GET index' do
-    before do
-      john.confirm
-      steve.confirm
-    end
     context 'with authenticated user' do
       it 'returns authorized nilms' do
         # force lazy evaluation of let to build NILMs
@@ -31,17 +28,12 @@ RSpec.describe NilmsController, type: :request do
     context 'without sign-in' do
       it 'returns unauthorized' do
         get "/nilms.json"
-        expect(response.status).to eq(401)
+        expect(response).to have_http_status(:unauthorized)
       end
     end
   end
 
-
   describe 'PUT update' do
-    before do
-      john.confirm
-      steve.confirm
-    end
     context 'with owner permissions' do
       it 'updates parameters' do
         @auth_headers = john.create_new_auth_token
@@ -49,7 +41,7 @@ RSpec.describe NilmsController, type: :request do
           put "/nilms/#{nilm.id}.json",
               params: {id: nilm.id, name: "changed:#{nilm.id}"},
               headers: @auth_headers
-          expect(response.status).to eq(200)
+              expect(response).to have_http_status(:ok)
           expect(response).to have_notice_message
           expect(nilm.reload.name).to eq("changed:#{nilm.id}")
         end
@@ -84,39 +76,102 @@ RSpec.describe NilmsController, type: :request do
     end
   end
 
-  describe 'GET show' do
-    before do
-      john.confirm
-      steve.confirm
-    end
-    context 'with any permissions' do
-      it 'returns the nilm as json' do
-        # john has some permission on all 3 nilms
+  describe 'PUT refresh' do
+    context 'with owner or admin' do
+      it 'updates the db' do
         @auth_headers = john.create_new_auth_token
-        [pete_nilm, lab_nilm, john_nilm].each do |nilm|
-          get "/nilms/#{nilm.id}.json",
+        [john_nilm, lab_nilm].each do |nilm|
+          mock_service = UpdateNilm.new
+          expect(mock_service).to receive(:run).and_return StubService.new
+          allow(UpdateNilm).to receive(:new)
+                           .and_return(mock_service)
+          put "/nilms/#{nilm.id}/refresh.json",
               headers: @auth_headers
-          expect(response.status).to eq(200)
-          expect(response.header['Content-Type']).to include('application/json')
-          body = JSON.parse(response.body)
-          expect(body['name']).to eq(nilm.name)
+          expect(response).to have_http_status(:ok)
         end
       end
     end
-    context 'without permissions' do
+    context 'with anyone else' do
       it 'returns unauthorized' do
-        # steve does NOT have permissions on john_nilm
         @auth_headers = steve.create_new_auth_token
-        get "/nilms/#{john_nilm.id}.json",
-            headers: @auth_headers
-        expect(response.status).to eq(401)
+        put "/nilms/#{john_nilm.id}/refresh.json",
+          headers: @auth_headers
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+    context 'without sign-in' do
+      it 'returns unauthorized' do
+        put "/nilms/#{pete_nilm.id}/refresh.json"
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+  describe 'POST create' do
+    context 'with authenticated user' do
+      it 'creates a NILM' do
+        @auth_headers = john.create_new_auth_token
+        post "/nilms.json",
+          params: {name: 'new', url: 'http://sampleurl/nilmdb'},
+          headers: @auth_headers
+        expect(response).to have_http_status(:ok)
+        #should have a warning that NILM cannot see database
+        expect(response).to have_warning_message
+        # make sure the NILM was built
+        nilm = Nilm.find_by_name('new')
+        expect(nilm).to_not be nil
+        expect(nilm.db.available).to be false
+        # user should be an admin
+        expect(john.admins_nilm?(nilm)).to be true
+      end
+
+      it 'returns errors on invalid request' do
+        # name must be unique
+        create(:nilm, url: 'http://can/only/be/one')
+        @auth_headers = john.create_new_auth_token
+        post "/nilms.json",
+          params: {name: 'CanOnlyBeOne', url: 'http://can/only/be/one'},
+          headers: @auth_headers
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response).to have_error_message
+        # make sure the NILM was not built
+        expect(Nilm.where(url: 'http://can/only/be/one').count).to eq 1
       end
     end
+
     context 'without sign-in' do
       it 'returns unauthorized' do
-        #  no headers: nobody is signed in, deny all
-        get "/nilms/#{john_nilm.id}.json"
-        expect(response.status).to eq(401)
+        post "/nilms.json",
+            params: {name: 'new', url: 'http://sampleurl/nilmdb'}
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+
+  describe 'DELETE destroy' do
+    context 'with nilm admin' do
+      it 'removes the nilm' do
+        @auth_headers = john.create_new_auth_token
+        delete "/nilms/#{john_nilm.id}.json",
+          headers: @auth_headers
+        expect(response).to have_http_status(:ok)
+        expect(response).to have_notice_message
+        expect(Nilm.exists?(john_nilm.id)).to be false
+      end
+    end
+    context 'with anybody else' do
+      it 'returns unauthorized' do
+        @auth_headers = nicky.create_new_auth_token
+        delete "/nilms/#{john_nilm.id}.json",
+          headers: @auth_headers
+        expect(response).to have_http_status(:unauthorized)
+        expect(Nilm.exists?(john_nilm.id)).to be true
+      end
+    end
+    context 'without sign-in' do
+      it 'returns unauthorized' do
+        delete "/nilms/#{john_nilm.id}.json"
+        expect(response).to have_http_status(:unauthorized)
+        expect(Nilm.exists?(john_nilm.id)).to be true
       end
     end
   end

spec/factories/nilms.rb

@@ -5,8 +5,9 @@ FactoryGirl.define do
 
   factory :nilm do
     db
-    name {Faker::StarWars.unique.planet}
+    name {Faker::Lorem.unique.words(3).join(' ')}
     description { Faker::Lorem.sentence }
+    url {Faker::Internet.unique.url}
     transient do
       admins []
       owners []

spec/models/db_spec.rb

@@ -23,6 +23,7 @@ RSpec.describe 'Db' do
     expect(DbFolder.find_by_id(root_folder.id)).to be nil
   end
 
+  #TODO: nilms will only have joule endpoint
   describe 'url' do
     it 'can be customized' do
       db_x = Db.create(url: 'custom_string')
@@ -31,7 +32,7 @@ RSpec.describe 'Db' do
     it 'can be left as default' do
       nilm = Nilm.create(url: 'base')
       db_x = Db.new(nilm: nilm, url: '')
-      expect(db_x.url).to eq('base/nilmdb')
+      expect(db_x.url).to eq('base')
     end
   end
 end

spec/services/nilm/create_nilm_spec.rb

 # frozen_string_literal: true
 require 'rails_helper'
 
-test_nilm_url = 'http://localhost:8080'
+test_nilm_url = 'http://localhost:8080/nilmdb'
 
 RSpec.describe 'CreateNilm' do
   describe 'build' do
     it 'creates and populates a Db object', :vcr do
       # mock the database updater
-      service = instance_double(UpdateDb, run: '')
+      service = instance_double(UpdateDb,
+        run: StubService.new,
+        errors: ['cannot contact database'],
+        warnings: [])
       allow(UpdateDb).to receive(:new).and_return(service)
+      user = create(:confirmed_user, first_name: "John")
       # run the NILM creation
       nilm_creator = CreateNilm.new
-      nilm_creator.run(name: 'test', url: test_nilm_url)
+      nilm_creator.run(
+        name: 'test',
+        description: 'test description',
+        url: test_nilm_url,
+        owner: user
+      )
       # verify NILM components are present
-      expect(nilm_creator.nilm).to be_present
-      expect(nilm_creator.nilm.db).to be_present
+      nilm = nilm_creator.nilm
+      #update errors show up as warnings
+      expect(nilm_creator.warnings.length).to eq 1
+      expect(nilm).to_not be nil
+      expect(nilm.db).to be_present
       # ...and the database has been populated
       expect(service).to have_received(:run)
+      expect(user.owns_nilm?(nilm)).to be true
     end
   end
 end

spec/services/nilm/update_nilm_spec.rb

+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'UpdateNilm' do
+  it 'updates the db when NilmDB is accessible' do
+    mock_service = instance_double(UpdateDb,
+      run: StubService.new,
+      errors: [],
+      warnings: [])
+    allow(UpdateDb).to receive(:new)
+                   .and_return(mock_service)
+
+    nilm = create(:nilm)
+    service = UpdateNilm.new()
+    service.run(nilm)
+    expect(service.success?).to be true
+  end
+  it 'returns error if db is nil' do
+    nilm = Nilm.create(name: 'test', url: 'invalid')
+    mock_service = instance_double(UpdateDb,
+      run: StubService.new)
+    allow(UpdateDb).to receive(:new)
+                   .and_return(mock_service)
+    service = UpdateNilm.new()
+    service.run(nilm)
+    expect(service.success?).to be false
+    expect(mock_service).to_not have_received(:run)
+  end
+  it 'returns error if db is offline' do
+    nilm = create(:nilm)
+    resp = StubService.new
+    resp.add_error('offline')
+    mock_service = instance_double(UpdateDb,
+      run: resp)
+    allow(UpdateDb).to receive(:new)
+                   .and_return(mock_service)
+    nilm = create(:nilm)
+    service = UpdateNilm.new()
+    service.run(nilm)
+    expect(service.success?).to be false
+  end
+
+end

spec/support/api_messages.rb

@@ -26,6 +26,34 @@ RSpec::Matchers.define :have_error_message do |regex|
   end
 end
 
+RSpec::Matchers.define :have_warning_message do |regex|
+  match do |response|
+    body = JSON.parse(response.body)
+    # omit regex to test if there are any warning messages
+    if(regex == nil)
+      return false if body["messages"]["warnings"].empty?
+      return true
+    end
+    # specify regex to match a particular warning message
+    body["messages"]["warnings"].each do |warning|
+      return true if(regex.match(warning))
+    end
+    return false
+  end
+
+  failure_message do |str|
+    body = JSON.parse(response.body)
+    "Expected #{regex} to match in [ " +
+      body["messages"]["warnings"].join(", ")+" ]"
+  end
+
+  failure_message_when_negated do |str|
+    body = JSON.parse(response.body)
+    "Expected #{regex} to not match in:\n" +
+      body["messages"]["warnings"].join(", ")
+  end
+end
+
 RSpec::Matchers.define :have_notice_message do |regex|
   match do |response|
     body = JSON.parse(response.body)