Initial concept

test/integration/usage_test.rb

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+require 'test_helper'
+
+module Liquid
+  class TestUsage < Usage
+    @messages = {}
+    class << self
+      def enable
+        Dir["#{__dir__}/usages/*.rb"].each { |f| require f }
+      end
+    end
+  end
+end
+
+class UsageTest < Minitest::Test
+  include Liquid
+
+  Usage.enable
+
+  def test_test_usages
+    Dir["#{__dir__}/usages/*.rb"].each { |f| require f }
+
+    template = Template.parse(%({{test}}))
+    assert_equal 'worked', template.render!('test' => 'worked')
+    assert_equal 'worked wonderfully', template.render!('test' => 'worked wonderfully')
+    assert_equal true, Usage.results["Using try_variable_find_in_environment"]
+  end
+
+  def test_live_usages
+    template = Template.parse(%({{test}}))
+    assert_equal 'worked', template.render!('test' => 'worked')
+    assert_equal 'worked wonderfully', template.render!('test' => 'worked wonderfully')
+    assert_equal true, Usage.results["Usage is enabled"]
+  end
+end