spec/unit/util/feature.rb


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#!/usr/bin/env ruby

Dir.chdir(File.dirname(__FILE__)) { (s = lambda { |f| File.exist?(f) ? require(f) : Dir.chdir("..") { s.call(f) } }).call("spec/spec_helper.rb") }

require 'puppet/util/feature'

describe Puppet::Util::Feature do
    before do
        @features = Puppet::Util::Feature.new("features")
        @features.stubs(:warn)
    end

    it "should consider undefined features to be absent" do
        @features.should_not be_defined_feature
    end

    it "should be able to add new features" do
        @features.add(:myfeature) {}
        @features.should respond_to(:myfeature?)
    end

    it "should call associated code when loading a feature" do
        $loaded_feature = false
        @features.add(:myfeature) { $loaded_feature = true}
        $loaded_feature.should be_true
    end

    it "should consider a feature absent when the feature load fails" do
        @features.add(:failer) { raise "foo" }
        @features.should_not be_failer
    end

    it "should consider a feature to be absent when the feature load returns false" do
        @features.add(:failer) { false }
        @features.should_not be_failer
    end

    it "should consider a feature to be present when the feature load returns true" do
        @features.add(:available) { true }
        @features.should be_available
    end

    it "should cache the results of a feature load" do
        $loaded_feature = 0
        @features.add(:myfeature) { $loaded_feature += 1 }
        @features.myfeature?
        @features.myfeature?
        $loaded_feature.should == 1
    end

    it "should support features with libraries" do
        lambda { @features.add(:puppet, :libs => %w{puppet}) }.should_not raise_error
    end

    it "should consider a feature to be present if all of its libraries are present" do
        @features.add(:myfeature, :libs => %w{foo bar})
        @features.expects(:require).with("foo")
        @features.expects(:require).with("bar")

        @features.should be_myfeature
    end

    it "should log and consider a feature to be absent if any of its libraries are absent" do
        @features.add(:myfeature, :libs => %w{foo bar})
        @features.expects(:require).with("foo").raises(LoadError)
        @features.stubs(:require).with("bar")

        Puppet.expects(:debug)

        @features.should_not be_myfeature
    end
end