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|
Feature: `raise_error` matcher
Use the `raise_error` matcher to specify that a block of code raises an error. The most
basic form passes if any error is thrown:
```ruby
expect { raise StandardError }.to raise_error
```
You can use `raise_exception` instead if you prefer that wording:
```ruby
expect { 3 / 0 }.to raise_exception
```
`raise_error` and `raise_exception` are functionally interchangeable, so use the one that
makes the most sense to you in any given context.
In addition to the basic form, above, there are a number of ways to specify details of an
error/exception:
```ruby
expect { raise "oops" }.to raise_error
expect { raise "oops" }.to raise_error(RuntimeError)
expect { raise "oops" }.to raise_error("oops")
expect { raise "oops" }.to raise_error(/op/)
expect { raise "oops" }.to raise_error(RuntimeError, "oops")
expect { raise "oops" }.to raise_error(RuntimeError, /op/)
expect { raise "oops" }.to raise_error(an_instance_of(RuntimeError).and having_attributes(message: "oops"))
```
Scenario: Expecting any error
Given a file named "example_spec" with:
"""
RSpec.describe "calling a missing method" do
it "raises" do
expect { Object.new.foo }.to raise_error
end
end
"""
When I run `rspec example_spec`
Then the example should pass
Scenario: Expecting a specific error
Given a file named "example_spec" with:
"""
RSpec.describe "calling a missing method" do
it "raises" do
expect { Object.new.foo }.to raise_error(NameError)
end
end
"""
When I run `rspec example_spec`
Then the example should pass
Scenario: Matching a message with a string
Given a file named "example_spec.rb" with:
"""ruby
RSpec.describe "matching error message with string" do
it "matches the error message" do
expect { raise StandardError, 'this message exactly'}.
to raise_error('this message exactly')
end
end
"""
When I run `rspec example_spec.rb`
Then the example should pass
Scenario: Matching a message with a regexp
Given a file named "example_spec.rb" with:
"""ruby
RSpec.describe "matching error message with regex" do
it "matches the error message" do
expect { raise StandardError, "my message" }.
to raise_error(/my mess/)
end
end
"""
When I run `rspec example_spec.rb`
Then the example should pass
Scenario: Matching a message with `with_message`
Given a file named "example_spec.rb" with:
"""ruby
RSpec.describe "matching error message with regex" do
it "matches the error message" do
expect { raise StandardError, "my message" }.
to raise_error.with_message(/my mess/)
end
end
"""
When I run `rspec example_spec.rb`
Then the example should pass
Scenario: Matching a class + message with string
Given a file named "example_spec.rb" with:
"""ruby
RSpec.describe "matching error message with string" do
it "matches the error message" do
expect { raise StandardError, 'this message exactly'}.
to raise_error(StandardError, 'this message exactly')
end
end
"""
When I run `rspec example_spec.rb`
Then the example should pass
Scenario: Matching a class + message with regexp
Given a file named "example_spec.rb" with:
"""ruby
RSpec.describe "matching error message with regex" do
it "matches the error message" do
expect { raise StandardError, "my message" }.
to raise_error(StandardError, /my mess/)
end
end
"""
When I run `rspec example_spec.rb`
Then the example should pass
Scenario: Setting expectations on error object passed to block
Given a file named "example_spec" with:
"""
RSpec.describe "#foo" do
it "raises NameError" do
expect { Object.new.foo }.to raise_error { |error|
expect(error).to be_a(NameError)
}
end
end
"""
When I run `rspec example_spec`
Then the example should pass
Scenario: Setting expectations on an error object with chained matchers
Given a file named "example_spec" with:
"""
RSpec.describe "composing matchers" do
it "raises StandardError" do
expect { raise StandardError, "my message" }.
to raise_error(an_instance_of(StandardError).and having_attributes({"message" => "my message"}))
end
end
"""
When I run `rspec example_spec`
Then the example should pass
Scenario: Expecting no error at all
Given a file named "example_spec" with:
"""
RSpec.describe "#to_s" do
it "does not raise" do
expect { Object.new.to_s }.not_to raise_error
end
end
"""
When I run `rspec example_spec`
Then the example should pass
|
