CODEWITHSUNDEEP
rubyrspec
khebbie
khebbie

Reputation: 2503

rspec expect throws "undefined method"

I am a complete Ruby newby and am playing around with rspec

I am testing a class (Account) that has this line:

attr_reader :balance

When I try to test it with this method:

it "should deposit twice" do
  @acc.deposit(75)
  expect {
    @acc.deposit(50)
    }.to change(Account.balance).to(125)
end

I get this error:

NoMethodError in 'Account should deposit twice'
undefined method `balance' for Account:Class

I don't understand why I get the error since the attribute 'balance' exists, however I can see that it is not a method, but shouldn't rspec be able to find it anyway?

Update: As Jason noted I should be @acc.balance, since this is what I am asserting. But I get 'nil is not a symbol' when doing this.

Upvotes: 3

Views: 3350

Answers (3)

szeryf
szeryf

Reputation: 3387

It should be:

it "should deposit twice" do
  @acc.deposit(75)
  expect {
    @acc.deposit(50)
   }.to change { @acc.balance }.to(125)
end

Please note that you need use curly braces { ... } instead of parentheses ( ... ) around @acc.balance. Otherwise @acc.balance is evaluated before it is passed to change method which expects either symbol or block.

Upvotes: 1

Jed Schneider
Jed Schneider

Reputation: 14671

i think it should be

expect {@acc.deposit(50)}.to change(@acc.balance}.to(125)

Upvotes: 1

Jason Noble
Jason Noble

Reputation: 3766

It should be @acc.balance

it "should deposit twice" do
  @acc = Account.new
  @acc.deposit(75)
  @acc.balance.should == 75
  expect {
    @acc.deposit(50)
    }.to change(@acc, :balance).to(125)
end

Upvotes: 4

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