Lint: Fix RSpec/InstanceVariable cop

spec/bank/variable_exchange_spec.rb

@@ -165,30 +165,30 @@
   end
 
   describe "#export_rates" do
+    let(:expected_rates) { { "USD_TO_EUR" => 1.25, "USD_TO_JPY" => 2.55 } }
+
     before do
       bank.set_rate('USD', 'EUR', 1.25)
       bank.set_rate('USD', 'JPY', 2.55)
-
-      @rates = { "USD_TO_EUR" => 1.25, "USD_TO_JPY" => 2.55 }
     end
 
     context "with format == :json" do
       it "returns rates formatted as json" do
         json = bank.export_rates(:json)
-        expect(JSON.load(json)).to eq @rates
+        expect(JSON.load(json)).to eq expected_rates
       end
     end
 
     context "with format == :ruby" do
       it "returns rates formatted as ruby objects" do
-        expect(Marshal.load(bank.export_rates(:ruby))).to eq @rates
+        expect(Marshal.load(bank.export_rates(:ruby))).to eq expected_rates
       end
     end
 
     context "with format == :yaml" do
       it "returns rates formatted as yaml" do
         yaml = bank.export_rates(:yaml)
-        expect(YAML.load(yaml)).to eq @rates
+        expect(YAML.load(yaml)).to eq expected_rates
       end
     end
 
@@ -206,7 +206,7 @@
 
         bank.export_rates(:json, 'null')
 
-        expect(f).to have_received(:write).with(JSON.dump(@rates))
+        expect(f).to have_received(:write).with(JSON.dump(expected_rates))
       end
     end
 

spec/money/arithmetic_spec.rb

@@ -184,12 +184,13 @@
 
     context 'when conversions disallowed' do
       before do
-        @old_default_bank = Money.default_bank
         Money.disallow_currency_conversion!
       end
 
-      after do
-        Money.default_bank = @old_default_bank
+      around do |example|
+        previous_bank = Money.default_bank
+        example.call
+        Money.default_bank = previous_bank
       end
 
       context 'when currencies differ' do
@@ -858,12 +859,13 @@
 
       context 'when conversions disallowed' do
         before do
-          @old_default_bank = Money.default_bank
           Money.disallow_currency_conversion!
         end
 
-        after do
-          Money.default_bank = @old_default_bank
+        around do |example|
+          previous_bank = Money.default_bank
+          example.call
+          Money.default_bank = previous_bank
         end
 
         context 'when other is money with different currency' do

spec/money/formatting_spec.rb

@@ -110,9 +110,12 @@
     end
 
     context "when in Japanese" do
-      before { @_locale = I18n.locale; I18n.locale = :ja }
-
-      after  { I18n.locale = @_locale }
+      around do |example|
+        previous_locale = I18n.locale
+        I18n.locale = :ja
+        example.call
+        I18n.locale = previous_locale
+      end
 
       it "formats Japanese currency properly" do
         money = Money.new(1000, "JPY")

spec/money_spec.rb

@@ -154,13 +154,13 @@
   end
 
   describe ".add_rate" do
-    before do
-      @default_bank = Money.default_bank
+    around do |example|
+      previous_bank = Money.default_bank
       Money.default_bank = Money::Bank::VariableExchange.new
-    end
 
-    after do
-      Money.default_bank = @default_bank
+      example.call
+
+      Money.default_bank = previous_bank
     end
 
     it "saves rate into current bank" do
@@ -170,12 +170,10 @@
   end
 
   describe ".disallow_currency_conversions!" do
-    before do
-      @default_bank = Money.default_bank
-    end
-
-    after do
-      Money.default_bank = @default_bank
+    around do |example|
+      default_bank = Money.default_bank
+      example.call
+      Money.default_bank = default_bank
     end
 
     it "disallows conversions when doing money arithmetic" do