Ending selenium tests with assertions avoids "test bleed"

spec/integration/rails/test/integration/button_click_test.rb

@@ -5,51 +5,62 @@ class ButtonClickTest < ActionController::IntegrationTest
   test "should click button with type submit by id" do
     visit buttons_path
     click_button "button_submit_id"
+    assert_contain "success"
   end
   test "should click button with type submit by value" do
     visit buttons_path
     click_button "button_submit_value"
+    assert_contain "success"
   end
   test "should click button with type submit by html" do
     visit buttons_path
     click_button "button_submit_text"
+    assert_contain "success"
   end
 
   # <button type="image" ...>
   test "should click button with type image by id" do
     visit buttons_path
     click_button "button_image_id"
+    assert_contain "success"
   end
   test "should click button with type image by value" do
     visit buttons_path
     click_button "button_image_value"
+    assert_contain "success"
   end
   test "should click button with type image by html" do
     visit buttons_path
     click_button "button_image_text"
+    assert_contain "success"
   end
 
   # <input type="submit" ...>
   test "should click input with type submit by id" do
     visit buttons_path
     click_button "input_submit_id"
+    assert_contain "success"
   end
   test "should click input with type submit by value" do
     visit buttons_path
     click_button "input_submit_value"
+    assert_contain "success"
   end
 
   # <input type="image" ...>
   test "should click input with type image by id" do
     visit buttons_path
     click_button "input_image_id"
+    assert_contain "success"
   end
   test "should click input with type image by value" do
     visit buttons_path
     click_button "input_image_value"
+    assert_contain "success"
   end
   test "should click input with type image by alt" do
     visit buttons_path
     click_button "input_image_alt"
+    assert_contain "success"
   end
 end