Set new employee name from email on sign-up

spec/services/new_supplier_spec.rb

@@ -1,6 +1,25 @@
 require 'spec_helper'
 
 describe NewSupplier do
-  subject { described_class.new }
+  let(:new_supplier_params){ {supplier_name: "New suppy", email: 'suppy@example.com', password: 'admin123', password_confirmation: 'admin123'} }
+  subject { described_class.new new_supplier_params }
   it { should_not be_persisted }
+
+  it 'sets the name of the new employee to the email prefix' do
+    subject.save
+    subject.employee.name.should eq 'suppy'
+  end
+
+  it "does not save anything when the password_confirmation is wrong" do
+    new_supplier_params[:password_confirmation] = "something$else"
+    subject.save.should be false
+    subject.errors[:password_confirmation].should be_present
+  end
+
+  it "does not create a supplier when the name is already taken" do
+    create :supplier, name: 'New suppy'
+    expect{ subject.save }.not_to change{ Supplier.count }
+    subject.errors[:supplier_name].should be_present
+  end
+
 end