Thanks everyone for your help,
I have found the answer here
http://stackoverflow.com/questions/18337609/rspec-request-test-merges-hashes-in-array-in-post-json-params
It seems that the request parameters I was sending was not the correct ones.
this worked
it "should return an error if there is no correct email" do
params = {:subscription => {:email => "andre"}}
post "/magazine_subscriptions", params.to_json, {'ACCEPT' =>
"application/json", 'CONTENT_TYPE' => 'application/json'}end
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