add config file spec

lib/madness/settings.rb

@@ -10,6 +10,7 @@ def initialize
     end
 
     def reset
+      @config_file = nil
       set_defaults
       load_from_file if config_file
     end

spec/fixtures/.madness.yml

@@ -0,0 +1,8 @@
+# .madness.yml
+---
+path: 'to/enlightenment'
+port: '1337'
+bind: '4.3.2.1'
+autoh1: false
+highlighter: false
+line_numbers: false

spec/madness/settings_spec.rb

@@ -11,4 +11,20 @@
     expect(config.path).to eq '.'
   end
 
+  context "with a config file" do
+    before do
+      allow(config).to receive(:filename).and_return('spec/fixtures/.madness.yml')
+      config.reset
+    end
+
+    it "overrides config values" do
+      expect(config.path).to eq 'to/enlightenment'
+      expect(config.port).to eq '1337'
+      expect(config.bind).to eq '4.3.2.1'
+      expect(config.autoh1).to be false
+      expect(config.highlighter).to be false
+      expect(config.line_numbers).to be false
+    end
+  end
+
 end