Kill all mutants in Zero::Request::Parameter

I've also changed "extract_query_params" because it does not matter, if the
query string it empty or not for the "parse_string" method.

1 files changed, 5 insertions, 0 deletions

diff --git a/spec/unit/request/parameter/custom_spec.rb b/spec/unit/request/parameter/custom_spec.rb
index 9c720d2..1abebc9 100644
--- a/spec/unit/request/parameter/custom_spec.rb
+++ b/spec/unit/request/parameter/custom_spec.rb
@@ -15,4 +15,9 @@ describe Zero::Request::Parameter, '#custom' do
 
     expect(subject.custom['foo']).to eq('latest')
   end
+
+  it 'is empty if no custom parameter is set' do
+    expect(subject.custom).to eq({})
+    expect(env['zero.params.custom']).to eq({})
+  end
 end