Make partial_cache a configurable option

test/integration/tags/render_tag_test.rb

@@ -22,11 +22,17 @@ class RenderTagTest < Minitest::Test
   end
 
   def test_render_passes_named_arguments_into_inner_scope
+    partial_cache = Class.new do
+      def load(template_name, context:, parse_context:)
+        Liquid::Template.parse("my own partial cache (#{template_name})")
+      end
+    end.new
+    environment = Liquid::Environment.build(partial_cache: partial_cache)
+
     assert_template_result(
-      'My Product',
-      '{% render "product", inner_product: outer_product %}',
-      { 'outer_product' => { 'title' => 'My Product' } },
-      partials: { 'product' => '{{ inner_product.title }}' },
+      'my own partial cache (my_partial.liquid)',
+      '{% render "my_partial.liquid" %}',
+      environment: environment,
     )
   end
 

test/test_helper.rb

@@ -40,10 +40,10 @@ module Minitest
     def assert_template_result(
       expected, template, assigns = {},
       message: nil, partials: nil, error_mode: nil, render_errors: false,
-      template_factory: nil
+      template_factory: nil, environment: nil
     )
       file_system = StubFileSystem.new(partials || {})
-      environment = Liquid::Environment.build(file_system: file_system)
+      environment ||= Liquid::Environment.build(file_system: file_system)
       template = Liquid::Template.parse(template, line_numbers: true, error_mode: error_mode&.to_sym, environment: environment)
       registers = Liquid::Registers.new(file_system: file_system, template_factory: template_factory)
       context = Liquid::Context.build(static_environments: assigns, rethrow_errors: !render_errors, registers: registers, environment: environment)