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