require 'dply/env'

module Dply
  describe Env do

    ORIGINAL_ENV = { "O1" => "1", "O2" => "2" }
    CURRENT_ENV = { "C1" => "1", "C2" => "2" }
    EXTRA_ENV = { "O1" => "E", "C1" => "E" }

    def stub_env(with_bundler:)
      allow(ENV).to receive(:to_h).and_return(CURRENT_ENV)
      if with_bundler
        stub_const("Bundler", "bundler")
        allow(Bundler).to receive(:original_env).and_return(ORIGINAL_ENV)
      else
        hide_const("Bundler")
      end
    end

    describe '.build_env (extra_env, bundled_env:)' do
      context "when bundler is defined and bundled_env: true" do
        it "merges current_env with extra_env" do
          stub_env with_bundler: true
          env = Env.build_env(EXTRA_ENV, bundled_env: true)
          expect(env).to eq(CURRENT_ENV.merge(EXTRA_ENV))
        end
      end

      context "when bundler is defined and bundled_env: false" do
        it "merges original_env with extra_env" do
          stub_env with_bundler: true
          env = Env.build_env(EXTRA_ENV, bundled_env: false)
          expect(env).to eq(ORIGINAL_ENV.merge(EXTRA_ENV))
        end
      end

      context "when bundler is not defined and bundled_env: true" do
        it "merges current_env with extra_env" do
          stub_env with_bundler: false
          env = Env.build_env(EXTRA_ENV, bundled_env: true)
          expect(env).to eq(CURRENT_ENV.merge(EXTRA_ENV))
        end
      end

      context "when bundler is defined and bundled_env: false" do
        it "merges current_env with extra_env" do
          stub_env with_bundler: false
          env = Env.build_env(EXTRA_ENV, bundled_env: true)
          expect(env).to eq(CURRENT_ENV.merge(EXTRA_ENV))
        end
      end

    end
  end
end