spec/compiler_strategy_spec.rb

require_relative "spec_helper_initializer"

describe "Shakapacker::CompilerStrategy" do
  describe "#from_config" do
    it "returns and instance of MtimeStrategy when compiler_strategy is set to mtime" do
      allow(Shakapacker.config).to receive(:compiler_strategy).and_return("mtime")
      expect(Shakapacker::CompilerStrategy.from_config).to be_an_instance_of(Shakapacker::MtimeStrategy)
    end

    it "returns and instance of DigestStrategy when compiler_strategy is set to digest" do
      allow(Shakapacker.config).to receive(:compiler_strategy).and_return("digest")
      expect(Shakapacker::CompilerStrategy.from_config).to be_an_instance_of(Shakapacker::DigestStrategy)
    end

    it "raise exception for unknown compiler_strategy in the config file" do
      expected_error_message = "Unknown strategy 'other'. Available options are 'mtime' and 'digest'."
      allow(Shakapacker.config).to receive(:compiler_strategy).and_return("other")

      expect { Shakapacker::CompilerStrategy.from_config }.to raise_error(expected_error_message)
    end
  end
end