joshuaclayton / page_ez / 5718738279

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Allow finding individual elements within a has_many

What?
=====

This introduces three new methods available for an element declared via
`has_many` and `has_many_ordered`:

* `#{singular_name}_matching`
* `has_#{singular_name}_matching?`
* `has_no_#{singular_name}_matching?`

As an example:

```ruby
class TodosIndex < PageEz::Page
  has_one :list, "ul" do
    has_many :items, "li" do
      has_one :name, "span"
    end
  end
end
```

Given the following markup:

```html
<ul>
  <li><span>Buy milk</span></li>
  <li><span>Buy eggs</span></li>
</ul>
```

This will generate:

* `item_matching`
* `has_item_matching?`
* `has_no_item_matching?`

Each of these methods is capable of taking args to Capybara. Of note is
`text`, which allows for narrowing down to a specific element:

```ruby
todos_index = TodosIndex.new

expect(todos_index.item_matching(text: "Buy milk")).to have_name

expect(todos_index).to have_item_matching(text: "Buy milk")
expect(todos_index).to have_item_matching(text: "Buy eggs")
expect(todos_index).to have_no_item_matching(text: "Buy yogurt")
end
```

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