From ba6dd13990b2e9f80ef08b067d28a155640d05ef Mon Sep 17 00:00:00 2001
From: Gary Larizza <gary@puppetlabs.com>
Date: Fri, 3 Aug 2012 15:46:26 -0700
Subject: Add the pick() function
This function is similar to a coalesce function in SQL in that it will
return
the first value in a list of values that is not undefined or an empty
string
(two things in Puppet that will return a boolean false value).
Typically,
this function is used to check for a value in the Puppet
Dashboard/Enterprise
Console, and failover to a default value like the following:
$real_jenkins_version = pick($::jenkins_version, '1.449')
The value of $real_jenkins_version will first look for a top-scope
variable
called 'jenkins_version' (note that parameters set in the Puppet
Dashboard/
Enterprise Console are brought into Puppet as top-scope variables), and,
failing that, will use a default value of 1.449.
---
spec/unit/puppet/parser/functions/pick_spec.rb | 34 ++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 spec/unit/puppet/parser/functions/pick_spec.rb
(limited to 'spec/unit/puppet/parser')
diff --git a/spec/unit/puppet/parser/functions/pick_spec.rb b/spec/unit/puppet/parser/functions/pick_spec.rb
new file mode 100644
index 0000000..761db6b
--- /dev/null
+++ b/spec/unit/puppet/parser/functions/pick_spec.rb
@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the pick function" do
+ let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+ it "should exist" do
+ Puppet::Parser::Functions.function("pick").should == "function_pick"
+ end
+
+ it 'should return the correct value' do
+ scope.function_pick(['first', 'second']).should == 'first'
+ end
+
+ it 'should return the correct value if the first value is empty' do
+ scope.function_pick(['', 'second']).should == 'second'
+ end
+
+ it 'should remove empty string values' do
+ scope.function_pick(['', 'first']).should == 'first'
+ end
+
+ it 'should remove :undef values' do
+ scope.function_pick([:undef, 'first']).should == 'first'
+ end
+
+ it 'should remove :undefined values' do
+ scope.function_pick([:undefined, 'first']).should == 'first'
+ end
+
+ it 'should error if no values are passed' do
+ expect { scope.function_pick([]) }.to raise_error(Puppet::Error, /Must provide non empty value./)
+ end
+end
--
cgit v1.2.3