Make it possible to define a QA-specific page element

qa/qa/page/element.rb

@@ -3,21 +3,22 @@ module QA
     class Element
       attr_reader :name
 
-      def initialize(name, pattern)
+      def initialize(name, pattern = nil)
         @name = name
-        @pattern = pattern
+        @pattern = pattern || "qa-#{@name.to_s.gsub('_', '-')}"
       end
 
-      def matches?(line)
-        case @pattern
-        when Regexp
-          !!(line =~ @pattern)
-        when String
-          line.include?(@pattern)
+      def expression
+        if @pattern.is_a?(String)
+          @_regexp ||= Regexp.new(Regexp.escape(@pattern))
         else
-          raise ArgumentError, 'Pattern should be either String or Regexp!'
+          @pattern
         end
       end
+
+      def matches?(line)
+        !!(line =~ expression)
+      end
     end
   end
 end

qa/qa/page/view.rb

@@ -46,7 +46,7 @@ module QA
           @elements = []
         end
 
-        def element(name, pattern)
+        def element(name, pattern = nil)
           @elements.push(Page::Element.new(name, pattern))
         end
       end

qa/spec/page/element_spec.rb

@@ -2,11 +2,11 @@ describe QA::Page::Element do
   context 'when pattern is an expression' do
     subject { described_class.new(:something, /button 'Sign in'/) }
 
-    it 'is correctly matches against a string' do
+    it 'matches when there is a match' do
       expect(subject.matches?("button 'Sign in'")).to be true
     end
 
-    it 'does not match if string does not match against a pattern' do
+    it 'does not match if pattern is not present' do
       expect(subject.matches?("button 'Sign out'")).to be false
     end
   end
@@ -14,21 +14,24 @@ describe QA::Page::Element do
   context 'when pattern is a string' do
     subject { described_class.new(:something, 'button') }
 
-    it 'is correctly matches against a string' do
+    it 'matches when there is match' do
       expect(subject.matches?('some button in the view')).to be true
     end
 
-    it 'does not match if string does not match against a pattern' do
+    it 'does not match if pattern is not present' do
       expect(subject.matches?('text_field :name')).to be false
     end
   end
 
-  context 'when pattern is not supported' do
-    subject { described_class.new(:something, [/something/]) }
+  context 'when pattern is not provided' do
+    subject { described_class.new(:some_name) }
 
-    it 'raises an error' do
-      expect { subject.matches?('some line') }
-        .to raise_error ArgumentError
+    it 'matches when QA specific selector is present' do
+      expect(subject.matches?('some qa-some-name selector')).to be true
+    end
+
+    it 'does not match if QA selector is not there' do
+      expect(subject.matches?('some_name selector')).to be false
     end
   end
 end