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require 'spec_helper'
class InvalidConfigurationProvider; end
class ValidConfigurationProvider
def lookup(setting, *args); end
end
describe Configurate::LookupChain do
subject { described_class.new }
describe "#add_provider" do
it "adds a valid provider" do
expect {
subject.add_provider ValidConfigurationProvider
}.to change { subject.instance_variable_get(:@provider).size }.by 1
end
it "doesn't add an invalid provider" do
expect {
subject.add_provider InvalidConfigurationProvider
}.to raise_error ArgumentError
end
it "passes extra args to the provider" do
ValidConfigurationProvider.should_receive(:new).with(:extra)
subject.add_provider ValidConfigurationProvider, :extra
end
end
describe "#lookup" do
before do
subject.add_provider ValidConfigurationProvider
subject.add_provider ValidConfigurationProvider
@provider = subject.instance_variable_get(:@provider)
end
it "it tries all providers" do
setting = Configurate::SettingPath.new "some.setting"
setting.stub(:clone).and_return(setting)
@provider.each do |provider|
provider.should_receive(:lookup).with(setting).and_raise(Configurate::SettingNotFoundError)
end
subject.lookup(setting)
end
it "converts a string to a SettingPath" do
provider = @provider.first
path = stub
path.stub(:clone).and_return(path)
provider.should_receive(:lookup).with(path).and_raise(Configurate::SettingNotFoundError)
setting = "bar"
Configurate::SettingPath.should_receive(:new).with(setting).and_return(path)
subject.lookup(setting)
end
it "passes a copy of the SettingPath to the provider" do
provider = @provider.first
path = mock("path")
copy = stub("copy")
path.should_receive(:clone).at_least(:once).and_return(copy)
provider.should_receive(:lookup).with(copy).and_raise(Configurate::SettingNotFoundError)
subject.lookup(path)
end
it "stops if a value is found" do
@provider[0].should_receive(:lookup).and_return("something")
@provider[1].should_not_receive(:lookup)
subject.lookup("bla")
end
it "converts numbers to strings" do
@provider[0].stub(:lookup).and_return(5)
subject.lookup("foo").should == "5"
end
it "does not convert false to a string" do
@provider[0].stub(:lookup).and_return(false)
subject.lookup("enable").should be_false
end
it "converts 'true' to true" do
@provider[0].stub(:lookup).and_return("true")
subject.lookup("enable").should be_true
end
it "converts 'false' to false" do
@provider[0].stub(:lookup).and_return("false")
subject.lookup("enable").should be_false
end
it "returns the value unchanged if it can't be converted" do
value = mock
value.stub(:respond_to?).with(:to_s).and_return(false)
@provider[0].stub(:lookup).and_return(value)
subject.lookup("enable").should == value
end
it "returns nil if no value is found" do
@provider.each { |p| p.stub(:lookup).and_raise(Configurate::SettingNotFoundError) }
subject.lookup("not.me").should be_nil
end
end
end
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