add test to merge default configs

test/config_test.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class ConfigTest < Minitest::Test
+  def test_process_options
+    user_config = {
+      parse: {
+        smart: true,
+      },
+      render: {
+        unsafe: false,
+      },
+    }
+    processed_config = Commonmarker::Config.process_options(user_config)
+
+    expected_config = [:parse, :render, :extension].each_with_object({}) do |type, hash|
+      hash[type] = Commonmarker::Config::OPTIONS[type].merge(user_config[type] || {})
+    end
+
+    assert_equal(expected_config, processed_config)
+  end
+
+  def test_process_plugins
+    user_config = {
+      syntax_highlighter: {
+        path: "./themes",
+      },
+    }
+    processed_config = Commonmarker::Config.process_plugins(user_config)
+    expected_config = [:syntax_highlighter].each_with_object({}) do |type, hash|
+      hash[type] = Commonmarker::Config::PLUGINS[type].merge(user_config[type])
+    end
+
+    assert_equal(expected_config, processed_config)
+  end
+
+  def test_config_merges_directly
+    # hardbreaks work, the `\n` in between is rendered
+    assert_equal("<p>aaaa<br />\nbbbb</p>\n", Commonmarker.to_html("aaaa\nbbbb"))
+
+    # hardbreaks still work
+    assert_equal("<p>aaaa<br />\nbbbb</p>\n", Commonmarker.to_html("aaaa\nbbbb", options: { render: { unsafe: false } }))
+  end
+end