Change test for MacOS::languages.

Library/Homebrew/test/os/mac_spec.rb

@@ -5,10 +5,8 @@ require "os/mac"
 
 describe OS::Mac do
   describe "::languages" do
-    specify "all languages can be parsed by Locale::parse" do
-      subject.languages.each do |language|
-        expect { Locale.parse(language) }.not_to raise_error
-      end
+    it "returns a list of all languages" do
+      expect(subject.languages).not_to be_empty
     end
   end
 
@@ -16,10 +14,6 @@ describe OS::Mac do
     it "returns the first item from #languages" do
       expect(subject.language).to eq(subject.languages.first)
     end
-
-    it "can be parsed by Locale::parse" do
-      expect { Locale.parse(subject.language) }.not_to raise_error
-    end
   end
 
   describe "::sdk_path_if_needed" do