mirror of
https://github.com/jbranchaud/til
synced 2026-01-02 22:58:01 +00:00
32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# Assert About An Object's Attributes With RSpec
|
|
|
|
When testing an object that gets created as the result of some process, it can
|
|
be useful to assert about the attributes of that object. Not all of the
|
|
attributes are relevant and some can be hard to reliably test. Rather than
|
|
asserting about the result of calling `#attributes` or `#to_h` on an object, we
|
|
can focus in with the [`have_attributes`
|
|
matcher](https://relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/have-attributes-matcher)
|
|
provided by RSpec.
|
|
|
|
```ruby
|
|
RSpec.describe "have_attributes" do
|
|
it "can assert on an ActiveRecord object" do
|
|
book = Book.create(title: "Fledling", isbn: "123")
|
|
|
|
expect(book).to have_attributes(title: "Fledgling", isbn: "123")
|
|
end
|
|
|
|
it "can assert on a Struct" do
|
|
Name = Struct.new(:first, :last)
|
|
some_name = Name.new("Liz", "Lemon")
|
|
|
|
expect(some_name).to have_attributes(first: "Liz")
|
|
end
|
|
end
|
|
```
|
|
|
|
In this example we were able to assert about all or just a subset of the
|
|
attributes on both an `ActiveRecord` object and a `Struct`.
|
|
|
|
See [the docs](https://relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/have-attributes-matcher) for more details.
|