Fix #2894: Use [[:space:]] instead of \s in regexes.

test/unit/comment_test.rb

@@ -298,5 +298,10 @@ class CommentTest < ActiveSupport::TestCase
         end
       end
     end
+
+    context "during validation" do
+      subject { FactoryBot.build(:comment) }
+      should_not allow_value(" ").for(:body)
+    end
   end
 end

test/unit/dmail_test.rb

@@ -210,5 +210,15 @@ class DmailTest < ActiveSupport::TestCase
         end
       end
     end
+
+    context "during validation" do
+      subject { FactoryBot.build(:dmail) }
+
+      should_not allow_value(" ").for(:title)
+      should_not allow_value(" ").for(:body)
+      should_not allow_value(nil).for(:to)
+      should_not allow_value(nil).for(:from)
+      should_not allow_value(nil).for(:owner)
+    end
   end
 end

test/unit/tag_alias_test.rb

@@ -74,7 +74,7 @@ class TagAliasTest < ActiveSupport::TestCase
       ss = FactoryBot.create(:saved_search, :query => "123 ... 456", :user => CurrentUser.user)
       ta = FactoryBot.create(:tag_alias, :antecedent_name => "...", :consequent_name => "bbb")
       ss.reload
-      assert_equal(%w(123 456 bbb), ss.query.scan(/\S+/).sort)
+      assert_equal(%w(123 456 bbb), ss.query.split.sort)
     end
 
     should "update any affected posts when saved" do