Update specs to new rspec syntax

spec/views/tracks/new.html.haml_spec.rb

@@ -11,23 +11,24 @@ describe 'tracks/new' do
 
   it 'renders a form to create a track' do
     render
-    rendered.should have_selector("form[method=post][action='#{tracks_path}']")
-    rendered.should have_selector('input[type=submit]')
+    expect(rendered)
+      .to have_selector "form[method=post][action='#{tracks_path}']"
+    expect(rendered).to have_selector 'input[type=submit]'
   end
 
   it 'renders a text field with a label for the playlists name' do
-    track.stub(name: 'Mega song')
+    allow(track).to receive(:name) { 'Mega song' }
     render
-    rendered.should have_selector(
-      "input[type=text][name='track[name]'][value='Mega song']"
-    )
-    rendered.should have_selector('label[for=track_name]', text: 'Name')
+    expect(rendered)
+      .to have_selector "input[type=text][name='track[name]'][value='Mega song']"
+    expect(rendered)
+      .to have_selector('label[for=track_name]', text: 'Name')
   end
 
   it 'renders a file field with a label for the tracks file' do
     render
-    rendered.should have_selector("form[enctype='multipart/form-data']")
-    rendered.should have_selector("input[type=file][name='track[file]']")
-    rendered.should have_selector('label[for=track_file]', text: 'File')
+    expect(rendered).to have_selector("form[enctype='multipart/form-data']")
+    expect(rendered).to have_selector("input[type=file][name='track[file]']")
+    expect(rendered).to have_selector('label[for=track_file]', text: 'File')
   end
 end