brew/Library/Homebrew/test/build_environment_spec.rb

require "build_environment"

RSpec::Matchers.alias_matcher :use_userpaths, :be_userpaths

describe BuildEnvironment do
  let(:env) { described_class.new }

  describe "#<<" do
    it "returns itself" do
      expect(env << :foo).to be env
    end
  end

  describe "#merge" do
    it "returns itself" do
      expect(env.merge([])).to be env
    end
  end

  describe "#std?" do
    it "returns true if the environment contains :std" do
      env << :std
      expect(env).to be_std
    end

    it "returns false if the environment does not contain :std" do
      expect(env).not_to be_std
    end
  end

  describe "#userpaths?" do
    it "returns true if the environment contains :userpaths" do
      env << :userpaths
      expect(env).to use_userpaths
    end

    it "returns false if the environment does not contain :userpaths" do
      expect(env).not_to use_userpaths
    end
  end
end

describe BuildEnvironmentDSL do
  subject { double.extend(described_class) }

  context "single argument" do
    before(:each) do
      subject.instance_eval do
        env :userpaths
      end
    end

    its(:env) { is_expected.to use_userpaths }
  end

  context "multiple arguments" do
    before(:each) do
      subject.instance_eval do
        env :userpaths, :std
      end
    end

    its(:env) { is_expected.to be_std }
    its(:env) { is_expected.to use_userpaths }
  end
end