Add unit test for new behavior

Author: smortex

spec/unit/lib/puppet/parser/functions/docker_run_flags_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe 'the "docker_run_flags" parser function' do
+  let :scope do
+    node     = Puppet::Node.new('localhost')
+    compiler = Puppet::Parser::Compiler.new(node)
+    scope    = Puppet::Parser::Scope.new(compiler)
+    allow(scope).to receive(:environment).and_return(nil)
+    scope
+  end
+
+  it 'env with special chars' do
+    expect(scope.function_docker_run_flags([{ 'env' => [%.MYSQL_PASSWORD='"$()[]{}<>.], 'extra_params' => [] }])).to match(/^-e MYSQL_PASSWORD\\=\\'\\"\\\$\\\(\\\)\\\[\\\]\\\{\\\}\\<\\> \\$/)
+  end
+end