Fix GeoDynaicBackoff strategy code and added specs

app/workers/concerns/geo_dynamic_backoff.rb

@@ -11,6 +11,7 @@ module GeoDynamicBackoff
     end
   end
 
+  class_methods do
     private
 
     def linear_backoff_strategy(count)
@@ -22,4 +23,5 @@ module GeoDynamicBackoff
       count = count - 30 # we must start counting after 30
       (count**4) + 15 + (rand(30) * (count + 1))
     end
+  end
 end

spec/workers/concerns/geo_dynamic_backoff_spec.rb

+require 'spec_helper'
+
+describe GeoDynamicBackoff do
+  class TestWorkerBackOff
+    include Sidekiq::Worker
+    include GeoDynamicBackoff
+
+    def perform(options)
+      false
+    end
+  end
+
+  let(:worker) do
+    TestWorkerBackOff
+  end
+
+  context 'retry strategy' do
+    it 'sets a custom strategy for retrying' do
+      expect(worker.sidekiq_retry_in_block).to be_a(Proc)
+    end
+
+    it 'when retry_count is in 1..30, retries with linear_backoff_strategy' do
+      expect(worker).to receive(:linear_backoff_strategy)
+      worker.sidekiq_retry_in_block.call(1)
+
+      expect(worker).to receive(:linear_backoff_strategy)
+      worker.sidekiq_retry_in_block.call(30)
+    end
+
+    it 'when retry_count is > 30, retries with geometric_backoff_strategy' do
+      expect(worker).to receive(:geometric_backoff_strategy)
+      worker.sidekiq_retry_in_block.call(31)
+    end
+  end
+
+  context '.linear_backoff_strategy' do
+    it 'returns rand + retry_count' do
+      allow(worker).to receive(:rand).and_return(1)
+      expect(worker.sidekiq_retry_in_block.call(1)).to eq(2)
+    end
+  end
+
+  context '.geometric_backoff_strategy' do
+    it 'when retry_count is 31 for a fixed rand()=1 returns 18' do
+      allow(worker).to receive(:rand).and_return(1)
+      expect(worker.sidekiq_retry_in_block.call(31)).to eq(18)
+    end
+
+    it 'when retry_count is 32 for a fixed rand()=1 returns 18' do
+      allow(worker).to receive(:rand).and_return(1)
+      expect(worker.sidekiq_retry_in_block.call(32)).to eq(34)
+    end
+  end
+end