diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index f7a0e0b..b8a23c2 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -35,10 +35,6 @@ def authorize_condo_manager(condo)
     not_authorized_redirect unless authorize_manager(condo)
   end
 
-  def authorize_condo_resident(condo)
-    not_authorized_redirect if authorize_resident(condo)
-  end
-
   def authorize_user(condo)
     not_authorized_redirect unless authorize_manager(condo) || authorize_resident(condo)
   end
diff --git a/app/controllers/condos_controller.rb b/app/controllers/condos_controller.rb
index b0b152b..5b21f6d 100644
--- a/app/controllers/condos_controller.rb
+++ b/app/controllers/condos_controller.rb
@@ -55,9 +55,12 @@ def add_manager
 
   def associate_manager
     @manager = Manager.find(params[:manager_id])
-    return redirect_to @condo, notice: I18n.t('notices.condo.manager_associated') if @condo.managers << @manager
+    if @condo.managers.exclude?(@manager) && (@condo.managers << @manager)
+      return redirect_to @condo,
+                         notice: I18n.t('notices.condo.manager_associated')
+    end
 
-    redirect_to @condo, alert: I18n.t('notices.condo.manager_not_associated')
+    redirect_to @condo, alert: I18n.t('alerts.condo.manager_not_associated')
   end
 
   def residents
diff --git a/app/controllers/towers_controller.rb b/app/controllers/towers_controller.rb
index b369de0..892b843 100644
--- a/app/controllers/towers_controller.rb
+++ b/app/controllers/towers_controller.rb
@@ -78,10 +78,6 @@ def tower_params
     params.require(:tower).permit :name, :floor_quantity, :units_per_floor
   end
 
-  def condo_id_param
-    params.require :condo_id
-  end
-
   def authenticate_manager!
     return redirect_to root_path, notice: I18n.t('alerts.tower.access_denied') if resident_signed_in?
 
diff --git a/app/models/bill.rb b/app/models/bill.rb
index 4ff6e4d..cb539b1 100644
--- a/app/models/bill.rb
+++ b/app/models/bill.rb
@@ -42,9 +42,7 @@ def total_value_formatted
   end
 
   def rent_fee_value_formatted
-    return "R$ #{format('%.2f', values['rent_fee_cents'] / 100.0).gsub('.', ',')}" if values['rent_fee_cents'].positive?
-
-    false
+    "R$ #{format('%.2f', values['rent_fee_cents'] / 100.0).gsub('.', ',')}"
   end
 
   def self.format_value(value)
diff --git a/spec/models/resident_spec.rb b/spec/models/resident_spec.rb
index 583d48d..db8fb97 100644
--- a/spec/models/resident_spec.rb
+++ b/spec/models/resident_spec.rb
@@ -33,5 +33,15 @@
       expect(resident.errors).to include :registration_number
       expect(resident.errors.full_messages).to include 'CPF deve estar no seguinte formato: XXX.XXX.XXX-XX'
     end
+
+    it 'receipt must be valid' do
+      resident = build :resident, :with_residence
+      resident.receipt.attach(io: File.open('spec/support/images/test_image.txt'),
+                              filename: 'test_image.txt')
+
+      expect(resident).not_to be_valid
+      expect(resident.errors).to include :receipt
+      expect(resident.errors.full_messages).to include 'Comprovante deve ser um PDF, JPEG, JPG, ou PNG'
+    end
   end
 end
diff --git a/spec/requests/condo_requests_spec.rb b/spec/requests/condo_requests_spec.rb
new file mode 100644
index 0000000..5b19efa
--- /dev/null
+++ b/spec/requests/condo_requests_spec.rb
@@ -0,0 +1,28 @@
+require 'rails_helper'
+
+describe 'Condo requests' do
+  context 'POST /condos/:id/associate_manager' do
+    it 'and condo manager is already associated' do
+      manager = create :manager
+      condo_manager = create :manager, is_super: false
+      condo = create :condo
+      condo.managers << condo_manager
+
+      login_as manager, scope: :manager
+      post associate_manager_condo_path(condo), params: { manager_id: condo_manager.id }
+
+      expect(flash[:alert]).to eq 'Não foi possível adicionar o administrador'
+    end
+  end
+
+  context 'GET /condos/:id/residents' do
+    it 'and condo not found' do
+      manager = create :manager
+
+      login_as manager, scope: :manager
+      get residents_condo_path(1)
+
+      expect(response).to have_http_status :not_found
+    end
+  end
+end
diff --git a/spec/support/images/test_image.txt b/spec/support/images/test_image.txt
new file mode 100644
index 0000000..90b16f0
--- /dev/null
+++ b/spec/support/images/test_image.txt
@@ -0,0 +1 @@
+Para testar o tipo de imagem
\ No newline at end of file
diff --git a/spec/system/announcements/manager_registers_new_announcement_spec.rb b/spec/system/announcements/manager_registers_new_announcement_spec.rb
index 67ce5a8..a2cd970 100644
--- a/spec/system/announcements/manager_registers_new_announcement_spec.rb
+++ b/spec/system/announcements/manager_registers_new_announcement_spec.rb
@@ -34,4 +34,22 @@
       expect(page).not_to have_content 'ver mais'
     end
   end
+
+  it 'with missing params' do
+    manager = create :manager, full_name: 'Rodrigo Silva'
+    condo = create :condo
+    condo.managers << manager
+
+    login_as manager, scope: :manager
+    visit condo_path condo
+    within '#announcement_board' do
+      click_on 'Novo'
+    end
+    fill_in 'Título', with: ''
+    click_on 'Salvar'
+
+    expect(page).to have_current_path new_condo_announcement_path condo
+    expect(page).to have_content 'Mensagem não pode ficar em branco'
+    expect(page).to have_content 'Título não pode ficar em branco'
+  end
 end
diff --git a/spec/system/fees/user_send_receipt_spec.rb b/spec/system/fees/user_send_receipt_spec.rb
index b6e0ae8..8fbcd20 100644
--- a/spec/system/fees/user_send_receipt_spec.rb
+++ b/spec/system/fees/user_send_receipt_spec.rb
@@ -42,7 +42,7 @@
     expect(page).to have_content 'Para continuar, faça login ou registre-se.'
   end
 
-  it 'and succesfully send the image to the external api' do
+  it 'and successfully send the image to the external api' do
     condo = create :condo
     resident = create(:resident, :with_residence, condo:)
     json_data_details = Rails.root.join('spec/support/json/bill_1_details.json').read
@@ -89,4 +89,27 @@
     expect(page).to have_content 'Impossível enviar o comprovante ao servidor do PagueAluguel'
     expect(current_path).to eq bills_path
   end
+
+  it 'and fail to sends the image to the external api because of missing image' do
+    condo = create :condo
+    resident = create(:resident, :with_residence, condo:)
+    json_data_details = Rails.root.join('spec/support/json/bill_1_details.json').read
+    fake_response_details = double('faraday_response', body: json_data_details, success?: true)
+    fake_response_open_bills = double('faraday_response', body: '{"bills":[]}', success?: true)
+    fake_response_receipt = double('faraday_response', body: '{"message":"Comprovante recebido com sucesso."}',
+                                                       success?: true)
+
+    allow(Faraday).to receive(:get).with("http://localhost:4000/api/v1/units/#{resident.residence.id}/bills").and_return(fake_response_open_bills)
+    allow(Faraday).to receive(:get).with("http://localhost:4000/api/v1/bills/#{@first_bill_id_from_five_json}").and_return(fake_response_details)
+    allow(Faraday).to receive(:post).and_return(fake_response_receipt)
+
+    login_as resident, scope: :resident
+    visit bill_path @first_bill_id_from_five_json
+    click_on 'Enviar Comprovante'
+
+    click_on 'Enviar'
+
+    expect(page).to have_content 'Comprovante não pode ficar vazio'
+    expect(current_path).to eq new_bill_receipt_path @first_bill_id_from_five_json
+  end
 end