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Using file_fixture

Rails 5 adds simple access to sample files called file fixtures. File fixtures are normal files stored in spec/fixtures/files by default.

File fixtures are represented as +Pathname+ objects. This makes it easy to extract specific information:

file_fixture("example.txt").read # get the file's content
file_fixture("example.mp3").size # get the file size

You can customize files location by setting

RSpec.configure do |config|
  config.file_fixture_path = "spec/custom_directory"
end

Reading file content from fixtures directory​

And a file named "spec/fixtures/files/sample.txt" with:

Hello

And a file named "spec/lib/file_spec.rb" with:

require "rails_helper"

RSpec.describe "file" do
  it "reads sample file" do
    expect(file_fixture("sample.txt").read).to eq("Hello")
  end
end

When I run rspec spec/lib/file_spec.rb

Then the examples should all pass.

Creating a ActiveStorage::Blob from a file fixture​

Given a file named "spec/fixtures/files/sample.txt" with:

Hello

And a file named "spec/lib/fixture_set_blob.rb" with:

require "rails_helper"

RSpec.describe "blob" do
  it "creates a blob from a sample file" do
    expect(ActiveStorage::FixtureSet.blob(filename: "sample.txt")).to include("sample.txt")
  end
end

When I run rspec spec/lib/fixture_set_blob.rb

Then the examples should all pass.