A tech talk at globaldev where I demonstrated some new features in RSpec 3.

1. Improving specs!
with RSpec 3
A talk for @globaldev!
by @jamesjoshuahill

3. When I break behaviour!
I want specs to fail

4. When I refactor!
I want specs to pass

6. RSpec 3

7. Verifying doubles

8. config.mock_with :rspec do |mocks|
# Protect against typos
mocks.verify_doubled_constant_names = true
# Will be a default in RSpec 4
mocks.verify_partial_doubles = true
end

9. Composable matchers

10. expect(answer).to be_within(0.1).of(42)
!
expect(message).to start_with(“hi”)
.and end_with(“bye”)

11. expect(data).to match(
:answer => a_value_within(0.1).of(42),
:message => a_string_starting_with(“hi”)
.and ending_with(“bye”)
)

12. Test spies

14. Transpec
yujinakayama.me/transpec

15. $ transpec --keep its

16. subject { app }
!
# Bundle rspec-its gem to use old syntax
!
its(:data) { should eq “hello” }
!
!
# Or convert examples manually
!
it “returns the data” do
!
expect(subject.data).to eq “hello”
end

17. Any questions?