chore: Fix RuboCop Style/ZeroLengthPredicate

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-02-20 22:01:31 +0100 using RuboCop version 0.65.0.
+# on 2019-02-20 22:05:38 +0100 using RuboCop version 0.65.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -827,13 +827,14 @@ Style/MutableConstant:
     - 'lib/faraday/response/raise_error.rb'
     - 'lib/faraday/utils.rb'
 
-# Offense count: 8
+# Offense count: 9
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: both, prefix, postfix
 Style/NegatedIf:
   Exclude:
     - 'lib/faraday.rb'
+    - 'lib/faraday/adapter/em_http.rb'
     - 'lib/faraday/adapter/test.rb'
     - 'lib/faraday/connection.rb'
     - 'lib/faraday/encoders/flat_params_encoder.rb'
@@ -872,7 +873,7 @@ Style/Not:
     - 'lib/faraday/adapter/em_http.rb'
     - 'lib/faraday/response.rb'
 
-# Offense count: 11
+# Offense count: 7
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
 # SupportedStyles: predicate, comparison
@@ -881,9 +882,7 @@ Style/NumericPredicate:
     - 'spec/**/*'
     - 'lib/faraday/adapter/em_http.rb'
     - 'lib/faraday/adapter/net_http.rb'
-    - 'lib/faraday/adapter/test.rb'
     - 'lib/faraday/encoders/nested_params_encoder.rb'
-    - 'lib/faraday/options.rb'
     - 'lib/faraday/request/retry.rb'
     - 'lib/faraday/upload_io.rb'
     - 'lib/faraday/utils/headers.rb'
@@ -1171,14 +1170,6 @@ Style/YodaCondition:
     - 'script/proxy-server'
     - 'test/helper.rb'
 
-# Offense count: 4
-# Cop supports --auto-correct.
-Style/ZeroLengthPredicate:
-  Exclude:
-    - 'lib/faraday/adapter/em_http.rb'
-    - 'lib/faraday/adapter/test.rb'
-    - 'lib/faraday/options.rb'
-
 # Offense count: 267
 # Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https

lib/faraday/adapter/em_http.rb

@@ -225,7 +225,7 @@ def run
                 perform_request(&proc)
               end
             end
-            if @errors.size > 0
+            if !@errors.empty?
               raise Faraday::ClientError, @errors.first || "connection failed"
             end
           end

lib/faraday/adapter/test.rb

@@ -98,13 +98,13 @@ def options(path, headers = {}, &block)
         def verify_stubbed_calls
           failed_stubs = []
           @stack.each do |method, stubs|
-            unless stubs.size == 0
+            unless stubs.empty?
               failed_stubs.concat(stubs.map {|stub|
                 "Expected #{method} #{stub}."
               })
             end
           end
-          raise failed_stubs.join(" ") unless failed_stubs.size == 0
+          raise failed_stubs.join(" ") unless failed_stubs.empty?
         end
 
         protected

lib/faraday/options.rb

@@ -69,7 +69,7 @@ def deep_dup
     def fetch(key, *args)
       unless symbolized_key_set.include?(key.to_sym)
         key_setter = "#{key}="
-        if args.size > 0
+        if !args.empty?
           send(key_setter, args.first)
         elsif block_given?
           send(key_setter, Proc.new.call(key))