Optional line numbers for liquid errors

test/integration/error_handling_test.rb

@@ -22,6 +22,39 @@ end
 class ErrorHandlingTest < Minitest::Test
   include Liquid
 
+  def test_templates_parsed_with_line_numbers_renders_them_in_errors
+    template = <<-LIQUID
+      Hello,
+
+      {{ errors.standard_error }} will raise a standard error.
+
+      Bla bla test.
+
+      {{ errors.syntax_error }} will raise a syntax error.
+
+      This is an argument error: {{ errors.argument_error }}
+
+      Bla.
+    LIQUID
+
+    expected = <<-TEXT
+      Hello,
+
+      Liquid error: 3: standard error will raise a standard error.
+
+      Bla bla test.
+
+      Liquid syntax error: 7: syntax error will raise a syntax error.
+
+      This is an argument error: Liquid error: 9: argument error
+
+      Bla.
+    TEXT
+
+    output = Liquid::Template.parse(template, line_numbers: true).render('errors' => ErrorDrop.new)
+    assert_equal expected, output
+  end
+
   def test_standard_error
     template = Liquid::Template.parse( ' {{ errors.standard_error }} '  )
     assert_equal ' Liquid error: standard error ', template.render('errors' => ErrorDrop.new)
@@ -59,7 +92,7 @@ class ErrorHandlingTest < Minitest::Test
       end
     end
   end
-  
+
   def test_lax_unrecognized_operator
     template = Liquid::Template.parse(' {% if 1 =! 2 %}ok{% endif %} ', :error_mode => :lax)
     assert_equal ' Liquid error: Unknown operator =! ', template.render
@@ -91,8 +124,8 @@ class ErrorHandlingTest < Minitest::Test
   # Liquid should not catch Exceptions that are not subclasses of StandardError, like Interrupt and NoMemoryError
   def test_exceptions_propagate
     assert_raises Exception do
-      template = Liquid::Template.parse( ' {{ errors.exception }} '  )
+      template = Liquid::Template.parse('{{ errors.exception }}')
       template.render('errors' => ErrorDrop.new)
     end
   end
-end # ErrorHandlingTest
+end