1 files changed, 27 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/spec/functions/flatten_spec.rb b/puppet/modules/stdlib/spec/functions/flatten_spec.rb
new file mode 100755
index 00000000..de8c66d6
--- /dev/null
+++ b/puppet/modules/stdlib/spec/functions/flatten_spec.rb
@@ -0,0 +1,27 @@
+#! /usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe "the flatten function" do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+  it "should exist" do
+    expect(Puppet::Parser::Functions.function("flatten")).to eq("function_flatten")
+  end
+
+  it "should raise a ParseError if there is less than 1 arguments" do
+    expect { scope.function_flatten([]) }.to( raise_error(Puppet::ParseError))
+  end
+
+  it "should raise a ParseError if there is more than 1 argument" do
+    expect { scope.function_flatten([[], []]) }.to( raise_error(Puppet::ParseError))
+  end
+
+  it "should flatten a complex data structure" do
+    result = scope.function_flatten([["a","b",["c",["d","e"],"f","g"]]])
+    expect(result).to(eq(["a","b","c","d","e","f","g"]))
+  end
+
+  it "should do nothing to a structure that is already flat" do
+    result = scope.function_flatten([["a","b","c","d"]])
+    expect(result).to(eq(["a","b","c","d"]))
+  end
+end