Update specs to new rspec syntax

spec/integration/api/api_sign_in_spec.rb

@@ -13,17 +13,17 @@ feature 'API sign in' do
   scenario 'signs the user in with valid credentials' do
     do_create
 
-    response.should be_success
-    (JSON response.body).should include 'id'
+    expect(response).to be_success
+    expect(JSON response.body).to include 'id'
   end
 
   [:email, :password].each do |attr|
     scenario "rejects authentication with invalid credentials (#{attr})" do
-      user.stub(attr => user.send(attr) + '_INVALID')
+      allow(user).to receive(attr).and_return(user.send(attr) + '_INVALID')
       do_create
 
-      response.should be_not_found
-      response.body.should be_empty
+      expect(response).to be_not_found
+      expect(response.body).to be_empty
     end
   end
 end

spec/integration/api/cross_origin_request_spec.rb

@@ -22,12 +22,12 @@ feature 'API cross origin request' do
       { 'Origin' => origin }
     )
 
-    response.headers['Access-Control-Allow-Origin'].should == origin
-    response.headers['Access-Control-Allow-Credentials'].should == 'true'
-    response.headers['Access-Control-Allow-Methods'].should ==
-      'GET, POST, PUT, DELETE'
-    response.headers['Access-Control-Allow-Headers'].should ==
-      'Content-Type, Content-Length, X-Requested-With'
+    expect(response.headers['Access-Control-Allow-Origin']).to eq origin
+    expect(response.headers['Access-Control-Allow-Credentials']).to eq 'true'
+    expect(response.headers['Access-Control-Allow-Methods'])
+      .to eq 'GET, POST, PUT, DELETE'
+    expect(response.headers['Access-Control-Allow-Headers'])
+      .to eq 'Content-Type, Content-Length, X-Requested-With'
   end
 
   scenario 'basic request' do
@@ -36,15 +36,16 @@ feature 'API cross origin request' do
       'Origin' => origin
     }
 
-    response.headers['Access-Control-Allow-Origin'].should == origin
-    response.headers['Access-Control-Allow-Credentials'].should == 'true'
-    response.headers['Access-Control-Expose-Headers'].should == 'Content-Length'
+    expect(response.headers['Access-Control-Allow-Origin']).to eq origin
+    expect(response.headers['Access-Control-Allow-Credentials']).to eq 'true'
+    expect(response.headers['Access-Control-Expose-Headers'])
+      .to eq 'Content-Length'
   end
 
   scenario 'request without origin' do
     # FIXME: replace with a more stable/generic action
     get api_playlists_path(format: :json)
 
-    response.headers['Access-Control-Allow-Origin'].should == ''
+    expect(response.headers['Access-Control-Allow-Origin']).to eq ''
   end
 end

spec/integration/api/playlists_spec.rb

@@ -16,7 +16,7 @@ feature 'API playlists' do
 
     json = JSON response.body
 
-    json['id'].should be_a Fixnum
-    json['name'].should == playlist[:name]
+    expect(json['id']).to be_a Fixnum
+    expect(json['name']).to eq playlist[:name]
   end
 end

spec/integration/api/tracks_spec.rb

@@ -13,7 +13,7 @@ feature 'API tracks' do
 
     get api_tracks_path, format: :json
 
-    response.body.should == [
+    expect(response.body).to eq [
       {
         id: track_1.id,
         name: 'Track 1',