Add specs for token authenticable strategy factory method

spec/models/concerns/token_authenticatable_strategies/base_spec.rb

+require 'spec_helper'
+
+describe TokenAuthenticatableStrategies::Base do
+  let(:instance) { double(:instance) }
+  let(:field) { double(:field) }
+
+  describe '.fabricate' do
+    context 'when digest stragegy is specified' do
+      it 'fabricates digest strategy object' do
+        strategy = described_class.fabricate(instance, field, digest: true)
+
+        expect(strategy).to be_a TokenAuthenticatableStrategies::Digest
+      end
+    end
+
+    context 'when encrypted strategy is specified' do
+      it 'fabricates encrypted strategy object' do
+        strategy = described_class.fabricate(instance, field, encrypted: true)
+
+        expect(strategy).to be_a TokenAuthenticatableStrategies::Encrypted
+      end
+    end
+
+    context 'when no strategy is specified' do
+      it 'fabricates insecure strategy object' do
+        strategy = described_class.fabricate(instance, field, something: true)
+
+        expect(strategy).to be_a TokenAuthenticatableStrategies::Insecure
+      end
+    end
+  end
+end