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require 'spec_helper'
describe Puppet::Context do
let(:context) { Puppet::Context.new({ :testing => "value" }) }
context "with the implicit test_helper.rb pushed context" do
it "fails to lookup a value that does not exist" do
expect { context.lookup("a") }.to raise_error(Puppet::Context::UndefinedBindingError)
end
it "calls a provided block for a default value when none is found" do
expect(context.lookup("a") { "default" }).to eq("default")
end
it "behaves as if pushed a {} if you push nil" do
context.push(nil)
expect(context.lookup(:testing)).to eq("value")
context.pop
end
it "fails if you try to pop off the top of the stack" do
expect { context.pop }.to raise_error(Puppet::Context::StackUnderflow)
end
end
describe "with additional context" do
before :each do
context.push("a" => 1)
end
it "holds values for later lookup" do
expect(context.lookup("a")).to eq(1)
end
it "allows rebinding values in a nested context" do
inner = nil
context.override("a" => 2) do
inner = context.lookup("a")
end
expect(inner).to eq(2)
end
it "outer bindings are available in an overridden context" do
inner_a = nil
inner_b = nil
context.override("b" => 2) do
inner_a = context.lookup("a")
inner_b = context.lookup("b")
end
expect(inner_a).to eq(1)
expect(inner_b).to eq(2)
end
it "overridden bindings do not exist outside of the override" do
context.override("a" => 2) do
end
expect(context.lookup("a")).to eq(1)
end
it "overridden bindings do not exist outside of the override even when leaving via an error" do
begin
context.override("a" => 2) do
raise "this should still cause the bindings to leave"
end
rescue
end
expect(context.lookup("a")).to eq(1)
end
end
context "a rollback" do
it "returns to the mark" do
context.push("a" => 1)
context.mark("start")
context.push("a" => 2)
context.push("a" => 3)
context.pop
context.rollback("start")
expect(context.lookup("a")).to eq(1)
end
it "rolls back to the mark across a scoped override" do
context.push("a" => 1)
context.mark("start")
context.override("a" => 3) do
context.rollback("start")
expect(context.lookup("a")).to eq(1)
end
expect(context.lookup("a")).to eq(1)
end
it "fails to rollback to an unknown mark" do
expect do
context.rollback("unknown")
end.to raise_error(Puppet::Context::UnknownRollbackMarkError)
end
it "does not allow the same mark to be set twice" do
context.mark("duplicate")
expect do
context.mark("duplicate")
end.to raise_error(Puppet::Context::DuplicateRollbackMarkError)
end
end
context 'support lazy entries' do
it 'by evaluating a bound proc' do
result = nil
context.override(:a => lambda {|| 'yay'}) do
result = context.lookup(:a)
end
expect(result).to eq('yay')
end
it 'by memoizing the bound value' do
result1 = nil
result2 = nil
original = 'yay'
context.override(:a => lambda {|| tmp = original; original = 'no'; tmp}) do
result1 = context.lookup(:a)
result2 = context.lookup(:a)
end
expect(result1).to eq('yay')
expect(original).to eq('no')
expect(result2).to eq('yay')
end
end
end
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