Question

我正在使用RSpec（2.10.1）来测试模型上的验证，并提取了一些代码以与其他模型验证共享。验证首先写在Companies表上，因此代码如下所示：

# support/shared_examples.rb
shared_examples "a text field" do |field, fill, length|
  it "it should be long enough" do
    @company.send("#{field}=", fill * length)
    @company.should be_valid
  end

  etc...
end

，用法是：

# company_spec.rb
describe Company do
  before { @company = Company.new( init stuff here ) }

  describe "when address2" do
    it_behaves_like "a text field", "address2", "a", Company.address2.limit
  end

  etc...
end

我想将@company作为参数传递给共享示例，以便我可以将代码重用于不同的模型，如下所示：

# support/shared_examples.rb
shared_examples "a text field" do |model, field, fill, length|
  it "it should be long enough" do
    model.send("#{field}=", fill * length)
    model.should be_valid
  end

  etc...
end

，用法是：

# company_spec.rb
describe Company do
  before { @company = Company.new( init stuff here ) }

  describe "when address2" do
    it_behaves_like "a text field", @company, "address2", "a", Company.address2.limit
  end

  etc...
end

然而，当我这样做时，我得到undefined method 'address2' for nil:NilClass。看来@company没有被传递（不在范围内？）如何让这样的东西起作用？

Answer 1

问题是示例组中的self与self挂钩中的before不同，因此即使它具有相同的名称，它也不是相同的实例变量。

我建议您使用let来处理以下情况：

# support/shared_examples.rb
shared_examples "a text field" do |field, fill, length|
  it "it should be long enough" do
    model.send("#{field}=", fill * length)
    model.should be_valid
  end
end

# company_spec.rb
describe Company do
  describe "when address2" do
    it_behaves_like "a text field", "address2", "a", Company.address2.limit do
      let(:model) { Company.new( init stuff here ) }
    end
  end
end

如何将实例变量传递给RSpec共享示例

1 个答案: