have_attributes 匹配器

使用 have_attributes 匹配器指定对象的属性是否与预期属性匹配

  Person = Struct.new(:name, :age)
  person = Person.new("Jim", 32)

  expect(person).to have_attributes(:name => "Jim", :age => 32)
  expect(person).to have_attributes(:name => a_string_starting_with("J"), :age => (a_value > 30) )

如果实际值不响应任何预期属性，则匹配器将失败

  expect(person).to have_attributes(:name => "Jim", :color => 'red')

基本用法

给定一个名为“basic_have_attributes_matcher_spec.rb”的文件，其中包含

Person = Struct.new(:name, :age)

RSpec.describe Person.new("Jim", 32) do
  it { is_expected.to have_attributes(:name => "Jim") }
  it { is_expected.to have_attributes(:name => a_string_starting_with("J") ) }
  it { is_expected.to have_attributes(:age => 32) }
  it { is_expected.to have_attributes(:age => (a_value > 30) ) }
  it { is_expected.to have_attributes(:name => "Jim", :age => 32) }
  it { is_expected.to have_attributes(:name => a_string_starting_with("J"), :age => (a_value > 30) ) }
  it { is_expected.not_to have_attributes(:name => "Bob") }
  it { is_expected.not_to have_attributes(:age => 10) }
  it { is_expected.not_to have_attributes(:age => (a_value < 30) ) }

  # deliberate failures
  it { is_expected.to have_attributes(:name => "Bob") }
  it { is_expected.to have_attributes(:age => 10) }

  # fails if any of the attributes don't match
  it { is_expected.to have_attributes(:name => "Bob", :age => 32) }
  it { is_expected.to have_attributes(:name => "Jim", :age => 10) }
  it { is_expected.to have_attributes(:name => "Bob", :age => 10) }
end

当我运行 rspec basic_have_attributes_matcher_spec.rb

那么输出应包含“14 个示例，5 个失败”。