spec: do not highlight and/or/in/not after . as operators

Author: mhinz

spec/syntax/default_argument_spec.rb renamed to spec/syntax/operator_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe 'Default argument syntax' do
+describe 'Operators' do
  it 'default argument' do
  expect(<<~'EOF').to include_elixir_syntax('elixirOperator', '\\')
  def foo(bar \\ :baz)
@@ -12,4 +12,14 @@ def foo(bar \\ :baz)
  def foo(bar // :baz)
  EOF
  end
+
+ it 'in' do
+ expect(<<~EOF).to include_elixir_syntax('elixirOperator', 'in')
+ 'x' in ['x']
+ EOF
+
+ expect(<<~EOF).not_to include_elixir_syntax('elixirOperator', 'in')
+ :queue.in x, 5
+ EOF
+ end
 end