1 files changed, 94 insertions, 0 deletions
diff --git a/actionview/test/template/compiled_templates_test.rb b/actionview/test/template/compiled_templates_test.rb
new file mode 100644
index 0000000000..3cd6448e38
--- /dev/null
+++ b/actionview/test/template/compiled_templates_test.rb
@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+class CompiledTemplatesTest < ActiveSupport::TestCase
+  teardown do
+    ActionView::LookupContext::DetailsKey.clear
+  end
+
+  def test_template_with_nil_erb_return
+    assert_equal "This is nil: \n", render(template: "test/nil_return")
+  end
+
+  def test_template_with_ruby_keyword_locals
+    assert_equal "The class is foo",
+      render(file: "test/render_file_with_ruby_keyword_locals", locals: { class: "foo" })
+  end
+
+  def test_template_with_invalid_identifier_locals
+    locals = {
+      foo: "bar",
+      Foo: "bar",
+      "d-a-s-h-e-s": "",
+      "white space": "",
+    }
+    assert_equal locals.inspect, render(file: "test/render_file_inspect_local_assigns", locals: locals)
+  end
+
+  def test_template_with_delegation_reserved_keywords
+    locals = {
+      _: "one",
+      arg: "two",
+      args: "three",
+      block: "four",
+    }
+    assert_equal "one two three four", render(file: "test/test_template_with_delegation_reserved_keywords", locals: locals)
+  end
+
+  def test_template_with_unicode_identifier
+    assert_equal "🎂", render(file: "test/render_file_unicode_local", locals: { 🎃: "🎂" })
+  end
+
+  def test_template_with_instance_variable_identifier
+    assert_equal "bar", render(file: "test/render_file_instance_variable", locals: { "@foo": "bar" })
+  end
+
+  def test_template_gets_recompiled_when_using_different_keys_in_local_assigns
+    assert_equal "one", render(file: "test/render_file_with_locals_and_default")
+    assert_equal "two", render(file: "test/render_file_with_locals_and_default", locals: { secret: "two" })
+  end
+
+  def test_template_changes_are_not_reflected_with_cached_templates
+    assert_equal "Hello world!", render(file: "test/hello_world")
+    modify_template "test/hello_world.erb", "Goodbye world!" do
+      assert_equal "Hello world!", render(file: "test/hello_world")
+    end
+    assert_equal "Hello world!", render(file: "test/hello_world")
+  end
+
+  def test_template_changes_are_reflected_with_uncached_templates
+    assert_equal "Hello world!", render_without_cache(file: "test/hello_world")
+    modify_template "test/hello_world.erb", "Goodbye world!" do
+      assert_equal "Goodbye world!", render_without_cache(file: "test/hello_world")
+    end
+    assert_equal "Hello world!", render_without_cache(file: "test/hello_world")
+  end
+
+  private
+    def render(*args)
+      render_with_cache(*args)
+    end
+
+    def render_with_cache(*args)
+      view_paths = ActionController::Base.view_paths
+      ActionView::Base.new(view_paths, {}).render(*args)
+    end
+
+    def render_without_cache(*args)
+      path = ActionView::FileSystemResolver.new(FIXTURE_LOAD_PATH)
+      view_paths = ActionView::PathSet.new([path])
+      ActionView::Base.new(view_paths, {}).render(*args)
+    end
+
+    def modify_template(template, content)
+      filename = "#{FIXTURE_LOAD_PATH}/#{template}"
+      old_content = File.read(filename)
+      begin
+        File.open(filename, "wb+") { |f| f.write(content) }
+        yield
+      ensure
+        File.open(filename, "wb+") { |f| f.write(old_content) }
+      end
+    end
+end