test/models/blob_test.rb


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require "test_helper"
require "database/setup"

class ActiveStorage::BlobTest < ActiveSupport::TestCase
  test "create after upload sets byte size and checksum" do
    data = "Hello world!"
    blob = create_blob data: data

    assert_equal data, blob.download
    assert_equal data.length, blob.byte_size
    assert_equal Digest::MD5.base64digest(data), blob.checksum
  end

  test "download yields chunks" do
    blob   = create_blob data: "a" * 75.kilobytes
    chunks = []

    blob.download do |chunk|
      chunks << chunk
    end

    assert_equal 2, chunks.size
    assert_equal "a" * 64.kilobytes, chunks.first
    assert_equal "a" * 11.kilobytes, chunks.second
  end

  test "urls expiring in 5 minutes" do
    blob = create_blob

    freeze_time do
      assert_equal expected_url_for(blob), blob.service_url
      assert_equal expected_url_for(blob, disposition: :attachment), blob.service_url(disposition: :attachment)
    end
  end

  private
    def expected_url_for(blob, disposition: :inline)
      "/rails/active_storage/disk/#{ActiveStorage.verifier.generate(blob.key, expires_in: 5.minutes, purpose: :blob_key)}/#{blob.filename}?disposition=#{disposition}&content_type=#{blob.content_type}"
    end
end