Check authentication on each request (#26)

Reviewed-on: #26

test/system/sessions_test.rb

@@ -6,17 +6,14 @@ class SessionsTest < ApplicationSystemTestCase
   end
 
   test "should create session" do
-    visit new_session_url
-
-    fill_in "Email", with: @user.email
-    fill_in "Password", with: "secret"
-
-    click_on "Create Session"
+    login(@user.email)
 
     assert_text "Session was successfully created"
   end
 
   test "should destroy Session" do
+    login(@user.email)
+
     visit root_url
     click_on "Log out", match: :first