spec/gpio_spec.rb


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require 'fileutils'
require './spec/spec_helper'
require './gpio'

RSpec.describe Gpio do
  let(:gpio) { described_class.new(1, prefix: "./spec/fixtures") }

  before do
    gpio.value = false
  end

  describe "#export" do
    subject { gpio.export }

    before do
      FileUtils.touch("./spec/fixtures/export")
    end

    after do
      FileUtils.remove("./spec/fixtures/export")
    end

    it "writes the pin to the export file" do
      subject
      export_file = File.read("./spec/fixtures/export")
      expect(export_file).to eq("1")
    end

    it "sets the pin as an output" do
      subject
      direction_file = File.read("./spec/fixtures/gpio1/direction")
      expect(direction_file).to eq("out")
    end
  end

  describe "#toggle" do
    subject { gpio.toggle }

    it "toggles the value to true" do
      expect { subject }.to change { gpio.value }.from(false).to(true)
    end
  end

  describe "#value" do
    subject { gpio.value }

    it "returns false" do
      expect(subject).to be_falsey
    end

    context "value is set to true" do
      before do
        gpio.value = true
      end

      it "returns true" do
        expect(subject).to be_truthy
      end
    end
  end
end