fix notification args problem [fix 765]

features/init.feature

@@ -21,3 +21,12 @@ Feature: Guard "init" command
     When I run `guard init rspec`
     Then the output should match /rspec guard added to Guardfile, feel free to edit it$/
     And the file "Guardfile" should match /^guard :rspec, cmd: ['"]bundle exec rspec["'] do$/
+
+  Scenario: Add plugin when Guardfile contains only options
+    Given my Guardfile contains:
+    """
+    notification :off
+    """
+    When I run `guard init rspec`
+    Then the output should match /rspec guard added to Guardfile, feel free to edit it$/
+    And the file "Guardfile" should match /^guard :rspec, cmd: ['"]bundle exec rspec["'] do$/

lib/guard/dsl_reader.rb

@@ -15,7 +15,7 @@ def guard(name, _options = {})
     end
 
     # Stub everything else
-    def notification
+    def notification(_notifier, _opts = {})
     end
 
     def interactor(_options)

spec/lib/guard/dsl_reader_spec.rb

@@ -0,0 +1,38 @@
+require "guard/dsl_reader"
+
+RSpec.describe Guard::DslReader, exclude_stubs: [Guard::Dsl] do
+  methods = %w(
+    initialize guard notification interactor group watch callback
+    ignore ignore! logger scope directories clearing
+  ).map(&:to_sym)
+
+  methods.each do |meth|
+    describe "\##{meth} signature" do
+      it "matches base signature" do
+        expected = Guard::Dsl.instance_method(meth).arity
+        expect(subject.method(meth).arity).to eq(expected)
+      end
+    end
+  end
+
+  describe "guard" do
+    it "works without errors" do
+      expect { subject.guard("foo", bar: :baz) }.to_not raise_error
+    end
+  end
+
+  describe "plugin_names" do
+    it "returns encountered names" do
+      subject.guard("foo", bar: :baz)
+      subject.guard("bar", bar: :baz)
+      subject.guard("baz", bar: :baz)
+      expect(subject.plugin_names).to eq(%w(foo bar baz))
+    end
+  end
+
+  describe "notification" do
+    it "handles arguments without errors" do
+      expect { subject.notification(:off) }.to_not raise_error
+    end
+  end
+end