How to test some property of model in rails without assigning all other properties

Question

suppose we have a model contact with the following properties

class Contact < ActiveRecords:Base
validates :Name, presence: true
validates :Email, presence: true
validates :Phone, presence: true
End

Now i want to test these properties individually ant not by using Contact.save method to check if it validates or not, as in that case i have to create a separate object to test each case.

is their any way if we check that by this property if we are getting any error or exception?

Answer 1

Using shoulda gem you be able to validate fields one by one

describe Contact do
  it { should validate_presence_of :Name }
  it { should validate_presence_of :Email }
  it { should validate_presence_of :Phone }
end

https://github.com/thoughtbot/shoulda-matchers#validate_presence_of

You also be able to check whole object validation by:

it { expect(FactoryGirl.build(:contact)).to be_valid }

I suppose you're using factory_girl to build your test data

Update: Suppose you have a valid factory. Then you be able to test without shoulda gem

it { expect(FactoryGirl.build(:contract, :Name => '')).to be_invalid }
it { expect(FactoryGirl.build(:contract, :Email => '')).to be_invalid }
it { expect(FactoryGirl.build(:contract, :Phone => '')).to be_invalid }

Update 2: Without factory_girl

it { expect(Contact.new(:Name => 'Bruce', :Email => 'email@example.com', :Phone => '+123123')).to be_valid }
it { expect(Contact.new(:Email => 'email@example.com', :Phone => '+123123')).to be_invalid }
it { expect(Contact.new(:Name => 'Bruce', :Phone => '+123123')).to be_invalid }
it { expect(Contact.new(:Name => 'Bruce', :Email => 'email@example.com')).to be_invalid }

Answer 2

Example using plain RSpec:

describe Contact do

  let(:contact_params) {
    {
      Name: 'Contact Name',
      Email: 'contact@somewhere.com',
      Phone: '0123456789'
    }
  }

  it 'is valid with valid params' do
    contact = Contact.new(contact_params)
    expect(contact.valid?).to be_true
  end

  it 'is invalid when Name is missing' do
    contact_params.delete(:Name)
    contact = Contact.new(contact_params)
    expect(contact.valid?).to be_false
  end

end