1 files changed, 6 insertions, 3 deletions
diff --git a/actioncable/test/channel/periodic_timers_test.rb b/actioncable/test/channel/periodic_timers_test.rb
index 0cc4992ef6..17a8e45a35 100644
--- a/actioncable/test/channel/periodic_timers_test.rb
+++ b/actioncable/test/channel/periodic_timers_test.rb
@@ -38,23 +38,26 @@ class ActionCable::Channel::PeriodicTimersTest < ActiveSupport::TestCase
 
   test "disallow negative and zero periods" do
     [ 0, 0.0, 0.seconds, -1, -1.seconds, "foo", :foo, Object.new ].each do |invalid|
-      assert_raise ArgumentError, /Expected every:/ do
+      e = assert_raise ArgumentError do
         ChatChannel.periodically :send_updates, every: invalid
       end
+      assert_match(/Expected every:/, e.message)
     end
   end
 
   test "disallow block and arg together" do
-    assert_raise ArgumentError, /not both/ do
+    e = assert_raise ArgumentError do
       ChatChannel.periodically(:send_updates, every: 1) { ping }
     end
+    assert_match(/not both/, e.message)
   end
 
   test "disallow unknown args" do
     [ "send_updates", Object.new, nil ].each do |invalid|
-      assert_raise ArgumentError, /Expected a Symbol/ do
+      e = assert_raise ArgumentError do
         ChatChannel.periodically invalid, every: 1
       end
+      assert_match(/Expected a Symbol/, e.message)
     end
   end