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Feature: `satisfy` matcher
The `satisfy` matcher is extremely flexible and can handle almost anything you want to
specify. It passes if the block you provide returns true:
```ruby
expect(10).to satisfy { |v| v % 5 == 0 }
expect(7).not_to satisfy { |v| v % 5 == 0 }
```
The default failure message ("expected [actual] to satisfy block") is not very descriptive or helpful.
To add clarification, you can provide your own description as an argument:
```ruby
expect(10).to satisfy("be a multiple of 5") do |v|
v % 5 == 0
end
```
Scenario: basic usage
Given a file named "satisfy_matcher_spec.rb" with:
"""ruby
RSpec.describe 10 do
it { is_expected.to satisfy { |v| v > 5 } }
it { is_expected.not_to satisfy { |v| v > 15 } }
# deliberate failures
it { is_expected.not_to satisfy { |v| v > 5 } }
it { is_expected.to satisfy { |v| v > 15 } }
it { is_expected.to_not satisfy("be greater than 5") { |v| v > 5 } }
it { is_expected.to satisfy("be greater than 15") { |v| v > 15 } }
end
"""
When I run `rspec satisfy_matcher_spec.rb`
Then the output should contain all of these:
| 6 examples, 4 failures |
| expected 10 not to satisfy block |
| expected 10 to satisfy block |
| expected 10 not to be greater than 5 |
| expected 10 to be greater than 15 |
|
