discourse/spec/lib/image_sizer_spec.rb

# frozen_string_literal: true

require "image_sizer"

RSpec.describe ImageSizer do
  before do
    SiteSetting.max_image_width = 500
    SiteSetting.max_image_height = 500
  end

  it "returns the same dimensions when smaller than the maximums" do
    expect(ImageSizer.resize(400, 200)).to eq([400, 200])
  end

  it "returns nil if the width is nil" do
    expect(ImageSizer.resize(nil, 100)).to eq(nil)
  end

  it "returns nil if the height is nil" do
    expect(ImageSizer.resize(100, nil)).to eq(nil)
  end

  it "works with string parameters" do
    expect(ImageSizer.resize("100", "101")).to eq([100, 101])
  end

  describe "when larger than the maximum width" do
    before { @w, @h = ImageSizer.resize(600, 123) }

    it "returns the maximum width if larger than the maximum" do
      expect(@w).to eq(500)
    end

    it "resizes the height retaining the aspect ratio" do
      expect(@h).to eq(102)
    end
  end

  describe "when larger than the maximum height" do
    before { @w, @h = ImageSizer.resize(123, 600) }

    it "returns the maximum height if larger than the maximum" do
      expect(@h).to eq(500)
    end

    it "resizes the width retaining the aspect ratio" do
      expect(@w).to eq(102)
    end
  end

  describe "when larger than the maximums" do
    before { @w, @h = ImageSizer.resize(533, 800) }

    it "resizes both dimensions retaining the aspect ratio" do
      expect(@h).to eq(500)
      expect(@w).to eq(333)
    end
  end
end