1 files changed, 137 insertions, 0 deletions
diff --git a/actionpack/test/controller/render_json_test.rb b/actionpack/test/controller/render_json_test.rb
new file mode 100644
index 0000000000..82c1ba26cb
--- /dev/null
+++ b/actionpack/test/controller/render_json_test.rb
@@ -0,0 +1,137 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "controller/fake_models"
+require "active_support/logger"
+require "pathname"
+
+class RenderJsonTest < ActionController::TestCase
+  class JsonRenderable
+    def as_json(options = {})
+      hash = { a: :b, c: :d, e: :f }
+      hash.except!(*options[:except]) if options[:except]
+      hash
+    end
+
+    def to_json(options = {})
+      super except: [:c, :e]
+    end
+  end
+
+  class TestController < ActionController::Base
+    protect_from_forgery
+
+    def self.controller_path
+      "test"
+    end
+
+    def render_json_nil
+      render json: nil
+    end
+
+    def render_json_render_to_string
+      render plain: render_to_string(json: "[]")
+    end
+
+    def render_json_hello_world
+      render json: ActiveSupport::JSON.encode(hello: "world")
+    end
+
+    def render_json_hello_world_with_status
+      render json: ActiveSupport::JSON.encode(hello: "world"), status: 401
+    end
+
+    def render_json_hello_world_with_callback
+      render json: ActiveSupport::JSON.encode(hello: "world"), callback: "alert"
+    end
+
+    def render_json_with_custom_content_type
+      render json: ActiveSupport::JSON.encode(hello: "world"), content_type: "text/javascript"
+    end
+
+    def render_symbol_json
+      render json: ActiveSupport::JSON.encode(hello: "world")
+    end
+
+    def render_json_with_render_to_string
+      render json: { hello: render_to_string(partial: "partial") }
+    end
+
+    def render_json_with_extra_options
+      render json: JsonRenderable.new, except: [:c, :e]
+    end
+
+    def render_json_without_options
+      render json: JsonRenderable.new
+    end
+  end
+
+  tests TestController
+
+  def setup
+    # enable a logger so that (e.g.) the benchmarking stuff runs, so we can get
+    # a more accurate simulation of what happens in "real life".
+    super
+    @controller.logger = ActiveSupport::Logger.new(nil)
+
+    @request.host = "www.nextangle.com"
+  end
+
+  def test_render_json_nil
+    get :render_json_nil
+    assert_equal "null", @response.body
+    assert_equal "application/json", @response.content_type
+  end
+
+  def test_render_json_render_to_string
+    get :render_json_render_to_string
+    assert_equal "[]", @response.body
+  end
+
+  def test_render_json
+    get :render_json_hello_world
+    assert_equal '{"hello":"world"}', @response.body
+    assert_equal "application/json", @response.content_type
+  end
+
+  def test_render_json_with_status
+    get :render_json_hello_world_with_status
+    assert_equal '{"hello":"world"}', @response.body
+    assert_equal 401, @response.status
+  end
+
+  def test_render_json_with_callback
+    get :render_json_hello_world_with_callback, xhr: true
+    assert_equal '/**/alert({"hello":"world"})', @response.body
+    assert_equal "text/javascript", @response.content_type
+  end
+
+  def test_render_json_with_custom_content_type
+    get :render_json_with_custom_content_type, xhr: true
+    assert_equal '{"hello":"world"}', @response.body
+    assert_equal "text/javascript", @response.content_type
+  end
+
+  def test_render_symbol_json
+    get :render_symbol_json
+    assert_equal '{"hello":"world"}', @response.body
+    assert_equal "application/json", @response.content_type
+  end
+
+  def test_render_json_with_render_to_string
+    get :render_json_with_render_to_string
+    assert_equal '{"hello":"partial html"}', @response.body
+    assert_equal "application/json", @response.content_type
+  end
+
+  def test_render_json_forwards_extra_options
+    get :render_json_with_extra_options
+    assert_equal '{"a":"b"}', @response.body
+    assert_equal "application/json", @response.content_type
+  end
+
+  def test_render_json_calls_to_json_from_object
+    get :render_json_without_options
+    assert_equal '{"a":"b"}', @response.body
+  end
+end