spec: uses case conditional

spec/models/rating/averager_data_spec.rb

@@ -13,9 +13,10 @@ RSpec.describe Rating::Rating, ':averager_data' do
     end
 
     it 'returns the average of number of records for the given resource type' do
-      if ENV.fetch('DB') == 'mysql'
+      case ENV.fetch('DB')
+      when 'mysql'
         expect(result.count_avg).to eq(BigDecimal('1.333333333333333333'))
-      elsif ENV.fetch('DB') == 'postgres'
+      when 'postgres'
         expect(result.count_avg).to eq(BigDecimal('1.3333333333333333'))
       else
         raise('DB env missing!')

spec/models/rating/data_spec.rb

@@ -21,9 +21,10 @@ RSpec.describe Rating::Rating, ':data' do
     end
 
     it 'returns the estimate for a resource' do
-      if ENV.fetch('DB') == 'mysql'
+      case ENV.fetch('DB')
+      when 'mysql'
         expect(result[:estimate]).to eq(BigDecimal('42.5000000000000000012000000505'))
-      elsif ENV.fetch('DB') == 'postgres'
+      when 'postgres'
         expect(result[:estimate]).to eq(BigDecimal('42.5000000000000001200000000000000012505'))
       else
         raise('DB env missing!')

spec/models/rating/update_rating_spec.rb

@@ -9,10 +9,11 @@ RSpec.describe Rating::Rating, ':update_rating' do
     it 'updates the rating data of the given resource' do
       record = described_class.find_by(resource: article_1)
 
-      if ENV.fetch('DB') == 'mysql'
+      case ENV.fetch('DB')
+      when 'mysql'
         expect(record.average).to  eq(BigDecimal('50.5'))
         expect(record.estimate).to eq(BigDecimal('42.5'))
-      elsif ENV.fetch('DB') == 'postgres'
+      when 'postgres'
         expect(record.average).to  eq(BigDecimal('50.5'))
         expect(record.estimate).to eq(BigDecimal('42.5000000000000001'))
       else