Add tests to ensure subclasses inherit the headers from their superclass

Author: meanphil

test/abstract_unit.rb

@@ -141,7 +141,7 @@ def setup_response
     mock.get    "/posts/1.json",                 {}, @post
     mock.get    "/posts/1/comments.json",        {}, @comments
     # products
-    mock.get "/products/1.json", {}, @product
+    mock.get "/products/1.json", {"Accept"=>"application/json", "X-Inherited-Header"=>"present"}, @product
     mock.get "/products/1/inventory.json", {}, @inventory
     # pets
     mock.get "/people/1/pets.json", {}, @pets

test/cases/inheritence_test.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+require "fixtures/product"
+
+class InheritenceTest < ActiveSupport::TestCase
+  def test_sub_class_retains_ancestor_headers
+    ActiveResource::HttpMock.respond_to do |mock|
+      mock.get "/sub_products/1.json",
+               { "Accept" => "application/json", "X-Inherited-Header" => "present" },
+               { id: 1, name: "Sub Product" }.to_json,
+               200
+    end
+
+    sub_product = SubProduct.find(1)
+    assert_equal "SubProduct", sub_product.class.to_s
+  end
+end

test/fixtures/product.rb

@@ -2,4 +2,10 @@
 
 class Product < ActiveResource::Base
   self.site = "http://37s.sunrise.i:3000"
+  # X-Inherited-Header is for testing that any subclasses
+  # include the headers of this class
+  self.headers["X-Inherited-Header"] = 'present'
+end
+
+class SubProduct < Product
 end