Use composite pattern to return page view errors

qa/qa/page/base.rb

@@ -48,8 +48,8 @@ module QA
         @evaluator ||= Page::Base::DSL.new
       end
 
-      def self.validator
-        Page::Validator.new(self)
+      def self.errors
+        @errors ||= views.map(&:errors).flatten
       end
 
       class DSL

qa/qa/page/element.rb

@@ -8,15 +8,14 @@ module QA
         @pattern = pattern
       end
 
-      def expression?
-        @pattern.is_a?(Regexp)
-      end
-
       def matches?(line)
-        if expression?
-          line =~ pattern
+        case @pattern
+        when Regexp
+          !!(line =~ @pattern)
+        when String
+          line.include?(@pattern)
         else
-          line.includes?(pattern)
+          raise ArgumentError, 'Pattern should be either String or Regexp!'
         end
       end
     end

qa/qa/page/validator.rb

-module QA
-  module Page
-    class Validator
-      def initialize(page)
-        @page = page
-        @views = page.views
-      end
-
-      def errors
-        @errors ||= @views.map do |view|
-        end
-      end
-
-      def message
-      end
-    end
-  end
-end

qa/qa/page/view.rb

@@ -15,8 +15,8 @@ module QA
 
       def errors
         ##
-        # Reduce required elements by streaming views and making assertions on
-        # elements' patterns.
+        # Reduce required elements by streaming view and making assertions on
+        # elements' existence.
         #
         @missing ||= @elements.dup.tap do |elements|
           File.new(pathname.to_s).foreach do |line|

qa/spec/page/base_spec.rb

@@ -5,7 +5,7 @@ describe QA::Page::Base do
     end
   end
 
-  describe 'DSL for defining view partials', '.view' do
+  describe '.view', 'DSL for defining view partials' do
     subject do
       Class.new(described_class) do
         view 'path/to/some/view.html.haml' do
@@ -32,4 +32,19 @@ describe QA::Page::Base do
       end
     end
   end
+
+  describe '.errors' do
+    let(:view) { double('view') }
+
+    before do
+      allow(described_class).to receive(:views)
+        .and_return([view])
+
+      allow(view).to receive(:errors).and_return(['some error'])
+    end
+
+    it 'iterates views composite and returns errors' do
+      expect(described_class.errors).to eq ['some error']
+    end
+  end
 end

qa/spec/page/element_spec.rb

+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
+      expect(subject.matches?("button 'Sign in'")).to be true
+    end
+
+    it 'does not match if string does not match against a pattern' do
+      expect(subject.matches?("button 'Sign out'")).to be false
+    end
+  end
+
+  context 'when pattern is a string' do
+    subject { described_class.new(:something, 'button') }
+
+    it 'is correctly matches against a string' 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
+      expect(subject.matches?('text_field :name')).to be false
+    end
+  end
+
+  context 'when pattern is not supported' do
+    subject { described_class.new(:something, [/something/]) }
+
+    it 'raises an error' do
+      expect { subject.matches?('some line') }
+        .to raise_error ArgumentError
+    end
+  end
+end

qa/spec/page/view_spec.rb

@@ -57,5 +57,9 @@ describe QA::Page::View do
           .to match %r(Missing element `.*` in `.*/some/file.html` view)
       end
     end
+
+    context 'when view partial has not been found' do
+      pending
+    end
   end
 end