Lint: Fix Style/FileWrite

Author: sunny

.rubocop_todo.yml

@@ -226,7 +226,7 @@ def export_rates(format, file = nil, _opts = {})
           s = FORMAT_SERIALIZERS[format].dump(rates)
 
           unless file.nil?
-            File.open(file, "w") { |f| f.write(s) }
+            File.write(file, s)
           end
 
           s

lib/money/bank/variable_exchange.rb

@@ -3,7 +3,7 @@
 class Money
   class Currency
     module Loader
-      DATA_PATH = File.expand_path("../../../../config", __FILE__)
+      DATA_PATH = File.expand_path("../../../config", __dir__)
 
       class << self
         # Loads and returns the currencies stored in JSON files in the config directory.

lib/money/currency/loader.rb

@@ -200,13 +200,11 @@
 
     context "with :file provided" do
       it "writes rates to file" do
-        f = double('IO')
-        allow(File).to receive(:open).with('null', 'w').and_yield(f)
-        allow(f).to receive(:write)
+        allow(File).to receive(:write)
 
-        bank.export_rates(:json, 'null')
+        bank.export_rates(:json, "null")
 
-        expect(f).to have_received(:write).with(JSON.dump(expected_rates))
+        expect(File).to have_received(:write).with("null", JSON.dump(expected_rates))
       end
     end