Address PR comments: remove test and use return ... if

Library/Homebrew/cask/cmd/upgrade.rb

@@ -42,16 +42,14 @@ module Cask
           .map { |(old_cask, new_cask)| "#{new_cask.full_name} #{old_cask.version} -> #{new_cask.version}" }
           .join(", ")
 
-        if dry_run?
-          puts "Dry run: did not upgrade anything."
-        else
-          upgradable_casks.each do |(old_cask, new_cask)|
-            begin
-              upgrade_cask(old_cask, new_cask)
-            rescue CaskError => e
-              caught_exceptions << e
-              next
-            end
+        return puts "Dry run: did not upgrade anything." if dry_run?
+
+        upgradable_casks.each do |(old_cask, new_cask)|
+          begin
+            upgrade_cask(old_cask, new_cask)
+          rescue CaskError => e
+            caught_exceptions << e
+            next
           end
         end
 

Library/Homebrew/cmd/upgrade.rb

@@ -106,15 +106,13 @@ module Homebrew
       puts formulae_upgrades.join(", ")
     end
 
-    if args.dry_run?
-      puts "Dry run: did not upgrade anything."
-    else
-      upgrade_formulae(formulae_to_install)
+    return puts "Dry run: did not upgrade anything." if args.dry_run?
 
-      check_dependents(formulae_to_install)
+    upgrade_formulae(formulae_to_install)
 
-      Homebrew.messages.display_messages
-    end
+    check_dependents(formulae_to_install)
+
+    Homebrew.messages.display_messages
   end
 
   def upgrade_formulae(formulae_to_install)

Library/Homebrew/test/cmd/upgrade_spec.rb

@@ -16,17 +16,4 @@ describe "brew upgrade", :integration_test do
     expect(HOMEBREW_CELLAR/"testball/0.1").to be_a_directory
     expect(HOMEBREW_CELLAR/"testball/0.0.1").not_to exist
   end
-
-  it "can do a dry run upgrade" do
-    setup_test_formula "testball"
-    (HOMEBREW_CELLAR/"testball/0.0.1/foo").mkpath
-
-    expect { brew "upgrade", "--dry-run" }
-       .to output(/Dry run: did not upgrade anything/).to_stdout
-       .and not_to_output.to_stderr
-       .and be_a_success
-
-    expect(HOMEBREW_CELLAR/"testball/0.1").not_to exist
-    expect(HOMEBREW_CELLAR/"testball/0.0.1").to be_a_directory
-  end
 end