Rails - Test validation of enum fields - ruby-on-rails

Question

I'm using Rails 4 enums and I want to properly test them, so I set these tests up for my enum fields:
it { should validate_inclusion_of(:category).in_array(%w[sale sale_with_tax fees lease tax_free other payroll]) }
it { should validate_inclusion_of(:type).in_array(%w[receivable payable]) }
And this is the model they're validating:
class Invoice < ActiveRecord::Base
belongs_to :user
enum category: [:sale, :sale_with_tax, :fees, :lease, :tax_free, :other, :payroll]
enum type: [:receivable, :payable]
validates :user, presence: true
validates :issue_date, presence: true
validates :series, presence: true
validates :folio, presence: true
validates :issuing_location, presence: true
validates :payment_method, presence: true
validates :last_digits, presence: true
validates :credit_note, presence: true
validates :total, presence: true
validates :subtotal, presence: true
validates :category, presence: true
validates_inclusion_of :category, in: Invoice.categories.keys
validates :type, presence: true
validates_inclusion_of :type, in: Invoice.types.keys
end
But when I run the tests I get:
1) Invoice should ensure inclusion of type in [0, 1]
Failure/Error: it { should validate_inclusion_of(:type).in_array([0,1]) }
ArgumentError:
'123456789' is not a valid type
# ./spec/models/invoice_spec.rb:20:in `block (2 levels) in <top (required)>'
2) Invoice should ensure inclusion of category in [0, 1, 2, 3, 4, 5, 6]
Failure/Error: it { should validate_inclusion_of(:category).in_array([0,1,2,3,4,5,6]) }
ArgumentError:
'123456789' is not a valid category
# ./spec/models/invoice_spec.rb:19:in `block (2 levels) in <top (required)>'
I've also tried with string values in the test arrays, but I get the same error and I really don't understand it.

Answer 1

Using Shoulda matchers we can use the following to test the enum
it { should define_enum_for(:type).with([:receivable, :payable]) }
it { should define_enum_for(:category).
with(:sale, :sale_with_tax, :fees, :lease, :tax_free, :other, :payroll) }

Answer 2

Try this:
it { should validate_inclusion_of(:category).in_array(%w[sale sale_with_tax fees lease tax_free other payroll].map(&:to_sym)) }
Additionally, for code-cleanup, try putting the valid categories/types in a corresponding constant. Example:
class Invoice < ActiveRecord::Base
INVOICE_CATEGORIES = [:sale, :sale_with_tax, :fees, :lease, :tax_free, :other, :payroll]
enum category: INVOICE_CATEGORIES
end

Answer 3

Your migration could be the issue, it should look something like:
t.integer :type, default: 1
You may also consider testing this another way.
Maybe more like:
it "validates the category" do
expect(invoice with category fee).to be_valid
end

Answer 4

Use shoulda matchers along with check for column_type.
it do
should define_enum_for(:type).
with_values(:receivable, :payable).
backed_by_column_of_type(:integer)
end
it do
should define_enum_for(:category).
with_values(:sale, :sale_with_tax, :fees, :lease, :tax_free, :other, :payroll).
backed_by_column_of_type(:integer)
end

Answer 5

Just use shoulda matchers:
it { should define_enum_for(:type).with_values([:receivable, :payable]) }
it { should define_enum_for(:category).with_values(:sale, :sale_with_tax, :fees, :lease, :tax_free, :other, :payroll)}

Answer 6

You have this string in your validations:
validates_inclusion_of :category, in: Invoice.categories.keys
In case of enum
Invoice.categories.keys #=> ["sale", "sale_with_tax", "fees", "lease", "tax_free", "other", "payroll"]
You should update your object data with one of names of your enum.