avoid changing existing environment keys

1 files changed, 12 insertions, 0 deletions

diff --git a/spec/unit/request/parameter/initialize_spec.rb b/spec/unit/request/parameter/initialize_spec.rb
new file mode 100644
index 0000000..bc611b1
--- /dev/null
+++ b/spec/unit/request/parameter/initialize_spec.rb
@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+describe Zero::Request::Parameter, '#initialize' do
+  subject { Zero::Request::Parameter.new(env) }
+  let(:env) { EnvGenerator.get('/get', {
+    'zero.params.custom' => {'foo' => 'bar'} }) }
+
+  it 'does not overwrite parameters' do
+    subject
+    expect(env['zero.params.custom']).to have_key('foo')
+  end
+end