test(server): status code and header info

server/test/controllers/api/v1/statistics_controller_test.rb

@@ -0,0 +1,45 @@
+require 'test_helper'
+
+class Api::V1::StatisticsControllerTest < ActionDispatch::IntegrationTest
+  test "should get success code when call index" do
+    valid_get api_v1_statistics_url
+
+    assert_response :success
+  end
+
+  test "should set right content type when call index" do
+    valid_get api_v1_statistics_url
+
+    assert_equal "application/vnd.api+json", response.content_type
+  end
+
+  test "should respond with 415 Unsupported Media Type when Content-Type is wrong" do
+    get api_v1_statistics_url, headers: { "Content-Type": "text/plain" }
+
+    assert_equal 415, response.status
+  end
+
+  test "should respond with error object when Content-Type is wrong" do
+    error_object = Api::V1::Exceptions::WrongContentTypeError.new
+    response_json = RequestErrorSerializer.new([error_object], message: error_object.title).serialized_json
+
+    get api_v1_statistics_url, headers: { "Content-Type": "text/plain" }
+
+    assert_equal response_json, response.body
+  end
+
+  test "should respond with 406 Not Acceptable when Accept is wrong" do
+    get api_v1_statistics_url, headers: { "Content-Type": "application/vnd.api+json", "Accept": "application/json" }
+
+    assert_equal 406, response.status
+  end
+
+  test "should respond with error object when Accept is wrong" do
+    error_object = Api::V1::Exceptions::WrongAcceptError.new
+    response_json = RequestErrorSerializer.new([error_object], message: error_object.title).serialized_json
+
+    get api_v1_statistics_url, headers: { "Content-Type": "application/vnd.api+json", "Accept": "application/json" }
+
+    assert_equal response_json, response.body
+  end
+end