Raise the error that includes an error message

lib/sprockets/rails/helper.rb

@@ -369,7 +369,7 @@ def precompiled?(path)
           end
 
           def raise_unless_precompiled_asset(path)
-            raise Helper::AssetNotPrecompiled.new(path) if @check_precompiled_asset && !precompiled?(path)
+            raise Helper::AssetNotPrecompiledError.new(path) if @check_precompiled_asset && !precompiled?(path)
           end
       end
     end

test/test_helper.rb

@@ -880,12 +880,20 @@ def setup
     @bundle_js_name = '/assets/bundle.js'
   end
 
+  # both subclass and more specific error are supported due to
+  # https://github.com/rails/sprockets-rails/pull/414/commits/760a805a9f56d3df0d4b83bd4a5a6476eb3aeb29
   def test_javascript_precompile
     assert_raises(Sprockets::Rails::Helper::AssetNotPrecompiled) do
       @view.javascript_include_tag("not_precompiled")
     end
   end
 
+  def test_javascript_precompile_thows_the_descriptive_error
+    assert_raises(Sprockets::Rails::Helper::AssetNotPrecompiledError) do
+      @view.javascript_include_tag("not_precompiled")
+    end
+  end
+
   def test_stylesheet_precompile
     assert_raises(Sprockets::Rails::Helper::AssetNotPrecompiled) do
       @view.stylesheet_link_tag("not_precompiled")