---
title: RSpec
category: Ruby
---
### About
{: .-intro}
RSpec is a Ruby library for testing.
-
### Invoking tests
```sh
rake -T spec # List spec tasks
rake spec # Run all
rake spec/models/mymodel_spec.rb
rake spec/models/mymodel_spec.rb:27
```
## Writing tests
```rb
describe "A User (in general)" do
include UserSpecHelper
subject { Person.new }
let(:admin) { Person.new(role: :admin) }
context "setter methods" do
it "should do this" do
pending "some other thing"
expect(subject.name).to eq 'x'
end
end
end
```
### Before/after
```rb
before :each do
# before all tests
end
before :all do
# before this suite
end
after : all do
# after this suite
end
```
### Subjects
```rb
subject { CheckingAccount.new }
it { is_expected.to be_empty }
# also names: subject(:account) { ... }
```
## Expectations
```rb
target.should eq 1
target.should_not eq 1
expect(target).to eq 1
expect(target).not_to eq 1
```
### Numeric
```rb
expect(5).to be < 6
expect(5).to == 5
expect(5).to equal value
expect(5).to be_between(1, 10)
expect(5).to be_within(0.05).of value
```
### Compound expectations
```rb
expect(1).to (be < 2).or be > 5
```
Use `or`/`and` to string multiple matchers together. See: [Compound expectations](https://relishapp.com/rspec/rspec-expectations/docs/compound-expectations)
### Comparison
```rb
expect(x).to be value
expect(x).to satisfy { |arg| ... }
expect(x).to match /regexp/
```
### Predicate
```rb
expect(x).to be_zero # FixNum#zero?
expect(x).to be_empty # Array#empty?
expect(x).to have_key # Hash#has_key?
```
### Objects
```rb
expect(obj).to be_an_instance_of MyClass
expect(obj).to be_a_kind_of MyClass
expect(obj).to respond_to :save!
```
### Control flow
```rb
expect { user.save! }.to raise_error
expect { user.save! }.to raise_error(ExceptionName, /msg/)
expect { user.save! }.to throw :symbol
```
### Enumerables/arrays
```rb
expect(list).to include(