Write ApplicationHelper tests

test/helpers/application_helper_test.rb

@@ -0,0 +1,35 @@
+require 'test_helper'
+
+class ApplicationHelperTest < ActionView::TestCase
+  include ApplicationHelper
+  
+  test "when user is logged-in, links characters" do
+    log_in_user(:tolkien)
+    
+    link = link_if_present "Frodo Baggins", "character"
+    
+    assert_equal link_to("Frodo Baggins", characters(:frodo)), link
+  end
+  
+  test "when user is not logged-in, just returns the given name" do
+    link = link_if_present "Frodo Baggins", "character"
+    
+    assert_equal "Frodo Baggins", link
+  end
+  
+  test "when name is not found, just return the given name" do
+    log_in_user(:tolkien)
+    
+    link = link_if_present "Princess Zelda", "character"
+    
+    assert_equal "Princess Zelda", link
+  end
+  
+  test "print_property makes a link" do
+    log_in_user(:tolkien)
+    
+    property = print_property "The Ring-Bearer", "Frodo Baggins", "character"
+    
+    assert property.include? link_to("Frodo Baggins", characters(:frodo))
+  end
+end