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|
Feature: None
Fails for any argument.
Often used to explicitly specify that method does not accept any arguments:
```ruby
Contract C::None => Symbol
def a_symbol
:a_symbol
end
```
The same behavior can be achieved when argument list omitted:
```ruby
Contract Symbol
def a_symbol
:a_symbol
end
```
Background:
Given a file named "helper.rb" with:
"""ruby
def autorescue
yield
rescue => e
puts e.inspect
end
"""
Given a file named "none_usage.rb" with:
"""ruby
require "contracts"
require "./helper"
C = Contracts
class Example
include Contracts::Core
Contract C::None => Symbol
def self.a_symbol(*args)
:a_symbol
end
end
"""
Scenario: Accepts nothing
Given a file named "nothing.rb" with:
"""ruby
require "./none_usage"
puts Example.a_symbol
"""
When I run `ruby nothing.rb`
Then output should contain:
"""
a_symbol
"""
Scenario: Rejects any argument
Given a file named "anything.rb" with:
"""ruby
require "./none_usage"
autorescue { Example.a_symbol(nil) }
autorescue { Example.a_symbol(12) }
autorescue { Example.a_symbol(37.5) }
autorescue { Example.a_symbol("foo") }
autorescue { Example.a_symbol(:foo) }
autorescue { Example.a_symbol({}) }
autorescue { Example.a_symbol([]) }
autorescue { Example.a_symbol(Object) }
"""
When I run `ruby anything.rb`
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: nil
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: 12
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: 37.5
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: "foo"
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: :foo
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: {}
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: []
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
Then output should contain:
"""
ParamContractError: Contract violation for argument 1 of 1:
Expected: None,
Actual: Object
Value guarded in: Example::a_symbol
With Contract: None => Symbol
"""
|
