brew/Library/Homebrew/test/cask/download_spec.rb

# frozen_string_literal: true

RSpec.describe Cask::Download, :cask do
  describe "#verify_download_integrity" do
    subject(:verification) { described_class.new(cask).verify_download_integrity(downloaded_path) }

    let(:tap) { nil }
    let(:cask) { instance_double(Cask::Cask, token: "cask", sha256: expected_sha256, tap:) }
    let(:cafebabe) { "cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe" }
    let(:deadbeef) { "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef" }
    let(:computed_sha256) { cafebabe }
    let(:downloaded_path) { Pathname.new("cask.zip") }

    before do
      allow(downloaded_path).to receive_messages(file?: true, sha256: computed_sha256)
    end

    context "when the expected checksum is :no_check" do
      let(:expected_sha256) { :no_check }

      it "warns about skipping the check" do
        expect { verification }.to output(/skipping verification/).to_stderr
      end

      context "with an official tap" do
        let(:tap) { CoreCaskTap.instance }

        it "does not warn about skipping the check" do
          expect { verification }.not_to output(/skipping verification/).to_stderr
        end
      end
    end

    context "when expected and computed checksums match" do
      let(:expected_sha256) { Checksum.new(cafebabe) }

      it "does not raise an error" do
        expect { verification }.not_to raise_error
      end
    end

    context "when the expected checksum is nil" do
      let(:expected_sha256) { nil }

      it "outputs an error" do
        expect { verification }.to output(/sha256 "#{computed_sha256}"/).to_stderr
      end
    end

    context "when the expected checksum is empty" do
      let(:expected_sha256) { Checksum.new("") }

      it "outputs an error" do
        expect { verification }.to output(/sha256 "#{computed_sha256}"/).to_stderr
      end
    end

    context "when expected and computed checksums do not match" do
      let(:expected_sha256) { Checksum.new(deadbeef) }

      it "raises an error" do
        expect { verification }.to raise_error ChecksumMismatchError
      end
    end
  end
end