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|
Feature: And
Takes a variable number of contracts. The contract passes if all of the
contracts pass.
```ruby
Contract C::And[Float, C::Neg] => String
```
This example will validate first argument of a method and accept only
negative `Float`.
Background:
Given a file named "and_usage.rb" with:
"""ruby
require "contracts"
C = Contracts
class Example
include Contracts::Core
Contract C::And[Float, C::Neg] => String
def fneg_string(number)
number.to_i.to_s
end
end
"""
Scenario: Accepts negative float
Given a file named "accepts_negative_float.rb" with:
"""ruby
require "./and_usage"
puts Example.new.fneg_string(-3.7)
"""
When I run `ruby accepts_negative_float.rb`
Then output should contain:
"""
-3
"""
Scenario: Rejects positive float
Given a file named "rejects_positive_float.rb" with:
"""ruby
require "./and_usage"
puts Example.new.fneg_string(7.5)
"""
When I run `ruby rejects_positive_float.rb`
Then output should contain:
"""
: Contract violation for argument 1 of 1: (ParamContractError)
Expected: (Float and Neg),
Actual: 7.5
Value guarded in: Example::fneg_string
With Contract: And => String
"""
Scenario: Rejects negative integer
Given a file named "rejects_negative_integer.rb" with:
"""ruby
require "./and_usage"
puts Example.new.fneg_string(-5)
"""
When I run `ruby rejects_negative_integer.rb`
Then output should contain:
"""
: Contract violation for argument 1 of 1: (ParamContractError)
Expected: (Float and Neg),
Actual: -5
Value guarded in: Example::fneg_string
With Contract: And => String
"""
Scenario: Rejects positive integer
Given a file named "rejects_positive_integer.rb" with:
"""ruby
require "./and_usage"
puts Example.new.fneg_string(5)
"""
When I run `ruby rejects_positive_integer.rb`
Then output should contain:
"""
: Contract violation for argument 1 of 1: (ParamContractError)
Expected: (Float and Neg),
Actual: 5
Value guarded in: Example::fneg_string
With Contract: And => String
"""
Scenario: Rejects others
Given a file named "rejects_others.rb" with:
"""ruby
require "./and_usage"
puts Example.new.fneg_string(:foo)
"""
When I run `ruby rejects_others.rb`
Then output should contain:
"""
: Contract violation for argument 1 of 1: (ParamContractError)
Expected: (Float and Neg),
Actual: :foo
Value guarded in: Example::fneg_string
With Contract: And => String
"""
|
