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# encoding: utf-8
require File.join(File.expand_path(File.dirname(__FILE__)), "spec_helper")
require 'pathname'
describe "Font metrics caching" do
let(:document) { Prawn::Document.new }
subject { Prawn::FontMetricCache.new( document ) }
it "should start with an empty cache" do
subject.instance_variable_get( :@cache ).should be_empty
end
it "should cache the width of the provided string" do
subject.width_of('M', {})
subject.instance_variable_get( :@cache ).should have(1).entry
end
it "should only cache a single copy of the same string" do
subject.width_of('M', {})
subject.width_of('M', {})
subject.instance_variable_get( :@cache ).should have(1).entry
end
it "should cache different copies for different strings" do
subject.width_of('M', {})
subject.width_of('W', {})
subject.instance_variable_get( :@cache ).should have(2).entries
end
it "should cache different copies of the same string with different font sizes" do
subject.width_of('M', {})
document.font_size 24
subject.width_of('M', {})
subject.instance_variable_get( :@cache ).should have(2).entries
end
it "should cache different copies of the same string with different fonts" do
subject.width_of('M', {})
document.font 'Courier'
subject.width_of('M', {})
subject.instance_variable_get( :@cache ).should have(2).entries
end
end
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