1 files changed, 94 insertions, 0 deletions
diff --git a/actionview/test/template/test_test.rb b/actionview/test/template/test_test.rb
new file mode 100644
index 0000000000..78ba536dfc
--- /dev/null
+++ b/actionview/test/template/test_test.rb
@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+module PeopleHelper
+  def title(text)
+    content_tag(:h1, text)
+  end
+
+  def homepage_path
+    people_path
+  end
+
+  def homepage_url
+    people_url
+  end
+
+  def link_to_person(person)
+    link_to person.name, person
+  end
+end
+
+class PeopleHelperTest < ActionView::TestCase
+  def test_title
+    assert_equal "<h1>Ruby on Rails</h1>", title("Ruby on Rails")
+  end
+
+  def test_homepage_path
+    with_test_route_set do
+      assert_equal "/people", homepage_path
+    end
+  end
+
+  def test_homepage_url
+    with_test_route_set do
+      assert_equal "http://test.host/people", homepage_url
+    end
+  end
+
+  def test_link_to_person
+    with_test_route_set do
+      person = Struct.new(:name) {
+        extend ActiveModel::Naming
+        def to_model; self; end
+        def persisted?; true; end
+        def self.name; "Minitest::Mock"; end
+      }.new "David"
+
+      the_model = nil
+      extend Module.new {
+        define_method(:minitest_mock_path) { |model, *args|
+          the_model = model
+          "/people/1"
+        }
+      }
+      assert_equal '<a href="/people/1">David</a>', link_to_person(person)
+      assert_equal person, the_model
+    end
+  end
+
+  private
+    def with_test_route_set
+      with_routing do |set|
+        set.draw do
+          get "people", to: "people#index", as: :people
+        end
+        yield
+      end
+    end
+end
+
+class CrazyHelperTest < ActionView::TestCase
+  tests PeopleHelper
+
+  def test_helper_class_can_be_set_manually_not_just_inferred
+    assert_equal PeopleHelper, self.class.helper_class
+  end
+end
+
+class CrazySymbolHelperTest < ActionView::TestCase
+  tests :people
+
+  def test_set_helper_class_using_symbol
+    assert_equal PeopleHelper, self.class.helper_class
+  end
+end
+
+class CrazyStringHelperTest < ActionView::TestCase
+  tests "people"
+
+  def test_set_helper_class_using_string
+    assert_equal PeopleHelper, self.class.helper_class
+  end
+end