1 files changed, 28 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/spec/functions/prefix_spec.rb b/puppet/modules/stdlib/spec/functions/prefix_spec.rb
new file mode 100755
index 00000000..34cac530
--- /dev/null
+++ b/puppet/modules/stdlib/spec/functions/prefix_spec.rb
@@ -0,0 +1,28 @@
+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the prefix function" do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  it "raises a ParseError if there is less than 1 arguments" do
+    expect { scope.function_prefix([]) }.to raise_error(Puppet::ParseError, /number of arguments/)
+  end
+
+  it "raises an error if the first argument is not an array" do
+    expect {
+      scope.function_prefix([Object.new])
+    }.to raise_error(Puppet::ParseError, /expected first argument to be an Array/)
+  end
+
+
+  it "raises an error if the second argument is not a string" do
+    expect {
+      scope.function_prefix([['first', 'second'], 42])
+    }.to raise_error(Puppet::ParseError, /expected second argument to be a String/)
+  end
+
+  it "returns a prefixed array" do
+    result = scope.function_prefix([['a','b','c'], 'p'])
+    expect(result).to(eq(['pa','pb','pc']))
+  end
+end