Table matcher have_table_row does not wait for full duration on should_not

spec/support/matchers/table_matchers.rb

@@ -1,17 +1,37 @@
 RSpec::Matchers.define :have_table_row do |row|
 
-  match do |node|
+  match_for_should do |node|
     @row = row
 
-    begin
-      wait_until { node.all('tr').map { |tr| tr.all('th, td').map(&:text) }.include? row }
-    rescue TimeoutError
-      false
-    else
-      true
+    false_on_timeout_error do
+      wait_until { rows_under(node).include? row }
     end
   end
 
+  match_for_should_not do |node|
+    @row = row
+
+    false_on_timeout_error do
+      # Without this sleep, we trigger capybara's wait when looking up the table, for the full
+      # period of default_wait_time.
+      sleep 0.1
+      wait_until { !rows_under(node).include? row }
+    end
+  end
+
+  def rows_under(node)
+    node.all('tr').map { |tr| tr.all('th, td').map(&:text) }
+  end
+
+  def false_on_timeout_error
+    yield
+  rescue TimeoutError
+    false
+  else
+    true
+  end
+
+
   failure_message_for_should do |text|
     "expected to find table row #{@row}"
   end