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require 'spec_helper'
describe Virtus::Attribute, '#coerce' do
subject { object.coerce(input) }
fake(:coercer) { Virtus::Attribute::Coercer }
let(:object) {
described_class.build(String,
:coercer => coercer, :strict => strict, :required => required, :nullify_blank => nullify_blank)
}
let(:required) { true }
let(:nullify_blank) { false }
let(:input) { 1 }
let(:output) { '1' }
context 'when strict mode is turned off' do
let(:strict) { false }
it 'uses coercer to coerce the input value' do
mock(coercer).call(input) { output }
expect(subject).to be(output)
expect(coercer).to have_received.call(input)
end
end
context 'when strict mode is turned on' do
let(:strict) { true }
it 'uses coercer to coerce the input value' do
mock(coercer).call(input) { output }
mock(coercer).success?(String, output) { true }
expect(subject).to be(output)
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, output)
end
context 'when attribute is not required and input is nil' do
let(:required) { false }
let(:input) { nil }
it 'returns nil' do
mock(coercer).call(input) { input }
mock(coercer).success?(String, input) { false }
expect(subject).to be(nil)
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, input)
end
end
context 'when attribute is required and input is nil' do
let(:input) { nil }
it 'returns raises error' do
mock(coercer).call(input) { input }
mock(coercer).success?(String, input) { false }
expect { subject }.to raise_error(Virtus::CoercionError)
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, input)
end
end
it 'raises error when input was not coerced' do
mock(coercer).call(input) { input }
mock(coercer).success?(String, input) { false }
expect { subject }.to raise_error(Virtus::CoercionError)
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, input)
end
end
context 'when the input is an empty String' do
let(:input) { '' }
let(:output) { '' }
context 'when nullify_blank is turned on' do
let(:nullify_blank) { true }
let(:strict) { false }
let(:require) { false }
it 'returns nil' do
mock(coercer).call(input) { input }
mock(coercer).success?(String, input) { false }
expect(subject).to be_nil
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, input)
end
it 'returns the ouput if it was coerced' do
mock(coercer).call(input) { output }
mock(coercer).success?(String, output) { true }
expect(subject).to be(output)
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, output)
end
end
context 'when both nullify_blank and strict are turned on' do
let(:nullify_blank) { true }
let(:strict) { true }
it 'does not raises an coercion error' do
mock(coercer).call(input) { input }
mock(coercer).success?(String, input) { false }
expect { subject }.not_to raise_error
expect(subject).to be_nil
expect(coercer).to have_received.call(input)
expect(coercer).to have_received.success?(String, input)
end
end
end
end
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