比较匹配器

RSpec 提供了许多基于 Ruby 内置运算符的匹配器。这些可以用于值的一般化比较。例如

  expect(9).to be > 6
  expect(3).to be <= 3
  expect(1).to be < 6
  expect('a').to be < 'b'

数值运算符匹配器

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

RSpec.describe 18 do
  it { is_expected.to be < 20 }
  it { is_expected.to be > 15 }
  it { is_expected.to be <= 19 }
  it { is_expected.to be >= 17 }

  # deliberate failures
  it { is_expected.to be < 15 }
  it { is_expected.to be > 20 }
  it { is_expected.to be <= 17 }
  it { is_expected.to be >= 19 }
  it { is_expected.to be < 'a' }
end

RSpec.describe 'a' do
  it { is_expected.to be < 'b' }

  # deliberate failures
  it { is_expected.to be < 18 }
end

当我运行 rspec numeric_operator_matchers_spec.rb

则输出应包含“11 个示例，6 个失败”

并且输出应包含

     Failure/Error: it { is_expected.to be < 15 }

       expected: < 15
            got:   18

并且输出应包含

     Failure/Error: it { is_expected.to be > 20 }

       expected: > 20
            got:   18

并且输出应包含

     Failure/Error: it { is_expected.to be <= 17 }

       expected: <= 17
            got:    18

并且输出应包含

     Failure/Error: it { is_expected.to be >= 19 }

       expected: >= 19
            got:    18

并且输出应包含

     Failure/Error: it { is_expected.to be < 'a' }

       expected: < "a"
            got:   18

并且输出应包含

     Failure/Error: it { is_expected.to be < 18 }

       expected: < 18
            got:   "a"

字符串运算符匹配器

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

RSpec.describe "Strawberry" do
  it { is_expected.to be < "Tomato" }
  it { is_expected.to be > "Apple" }
  it { is_expected.to be <= "Turnip" }
  it { is_expected.to be >= "Banana" }

  # deliberate failures
  it { is_expected.to be < "Cranberry" }
  it { is_expected.to be > "Zuchini" }
  it { is_expected.to be <= "Potato" }
  it { is_expected.to be >= "Tomato" }
end

当我运行 rspec string_operator_matchers_spec.rb

则输出应包含“8 个示例，4 个失败”

并且输出应包含

     Failure/Error: it { is_expected.to be < "Cranberry" }

       expected: < "Cranberry"
            got:   "Strawberry"

并且输出应包含

     Failure/Error: it { is_expected.to be > "Zuchini" }

       expected: > "Zuchini"
            got:   "Strawberry"

并且输出应包含

     Failure/Error: it { is_expected.to be <= "Potato" }

       expected: <= "Potato"
            got:    "Strawberry"

并且输出应包含

     Failure/Error: it { is_expected.to be >= "Tomato" }

       expected: >= "Tomato"
            got:    "Strawberry"