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authorGary Larizza <gary@puppetlabs.com>2012-08-03 15:46:26 -0700
committerJeff McCune <jeff@puppetlabs.com>2012-11-15 08:52:19 -0500
commitba6dd13990b2e9f80ef08b067d28a155640d05ef (patch)
treefc0e4e13750bf80f2e4f470cc34cafe3083f18a8 /spec/unit/puppet/parser
parentf8635584a8fa8456186f04b3ace10bdcd9b5a886 (diff)
downloadpuppet-stdlib-ba6dd13990b2e9f80ef08b067d28a155640d05ef.tar.gz
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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.
Diffstat (limited to 'spec/unit/puppet/parser')
-rw-r--r--spec/unit/puppet/parser/functions/pick_spec.rb34
1 files changed, 34 insertions, 0 deletions
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