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# frozen_string_literal: true
require 'spec_helper'
require 'pathname'
describe Prawn::FontMetricCache do
let(:document) { Prawn::Document.new }
let(:font_metric_cache) { described_class.new(document) }
it 'starts with an empty cache' do
expect(font_metric_cache.instance_variable_get(:@cache)).to be_empty
end
it 'caches the width of the provided string' do
font_metric_cache.width_of('M', {})
expect(font_metric_cache.instance_variable_get(:@cache).size).to eq(1)
end
it 'onlies cache a single copy of the same string' do
font_metric_cache.width_of('M', {})
font_metric_cache.width_of('M', {})
expect(font_metric_cache.instance_variable_get(:@cache).size).to eq(1)
end
it 'caches different copies for different strings' do
font_metric_cache.width_of('M', {})
font_metric_cache.width_of('W', {})
expect(font_metric_cache.instance_variable_get(:@cache).entries.size)
.to eq 2
end
it 'caches different copies of the same string with different font sizes' do
font_metric_cache.width_of('M', {})
document.font_size 24
font_metric_cache.width_of('M', {})
expect(font_metric_cache.instance_variable_get(:@cache).entries.size)
.to eq 2
end
it 'caches different copies of the same string with different fonts' do
font_metric_cache.width_of('M', {})
document.font 'Courier'
font_metric_cache.width_of('M', {})
expect(font_metric_cache.instance_variable_get(:@cache).entries.size)
.to eq 2
end
end
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