Adds simple Budget specs

app/models/budget.rb

@@ -1,5 +1,12 @@
 class Budget < ActiveRecord::Base
 
+  VALID_PHASES = %W{on_hold accepting selecting balloting finished}
+
+  validates :phase, inclusion: { in: VALID_PHASES }
+
+  has_many :investments
+  has_many :ballots
+
   def on_hold?
     phase == "on_hold"
   end
@@ -21,3 +28,4 @@ class Budget < ActiveRecord::Base
   end
 
 end
+

spec/factories.rb

@@ -358,4 +358,9 @@ FactoryGirl.define do
     sequence(:name) { |n| "District #{n}" }
     census_code { '01' }
   end
+
+  factory :budget do
+    sequence(:name) {|n| "Budget #{n}" }
+    phase "on_hold"
+  end
 end

spec/models/budget_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+describe Budget do
+  it "validates the phase" do
+    budget = create(:budget)
+    Budget::VALID_PHASES.each do |phase|
+      budget.phase = phase
+      expect(budget).to be_valid
+    end
+
+    budget.phase = 'inexisting'
+    expect(budget).to_not be_valid
+  end
+end
+