GitlatNet#discover only parse JSON if a 200

lib/gitlab_net.rb

@@ -35,7 +35,7 @@ class GitlabNet
 
   def discover(actor)
     resp = get("#{internal_api_endpoint}/discover?#{actor.identifier_key}=#{actor.id}")
-    JSON.parse(resp.body)
+    JSON.parse(resp.body) if resp.code == HTTP_SUCCESS
   rescue JSON::ParserError, ApiUnreachableError
     nil
   end

spec/gitlab_net_spec.rb

@@ -42,7 +42,7 @@ describe GitlabNet, vcr: true do
   end
 
   describe '#discover' do
-    it 'should return user has based on key id' do
+    it 'returns user has based on key id' do
       VCR.use_cassette("discover-ok") do
         user = gitlab_net.discover(actor1)
         expect(user['name']).to eql 'Administrator'
@@ -50,6 +50,12 @@ describe GitlabNet, vcr: true do
       end
     end
 
+    it 'returns nil if the user cannot be found' do
+      VCR.use_cassette("discover-not-found") do
+        expect(gitlab_net.discover(actor1)).to be_nil
+      end
+    end
+
     it 'adds the secret_token to request' do
       VCR.use_cassette("discover-ok") do
         allow_any_instance_of(Net::HTTP::Get).to receive(:set_form_data).with(hash_including(secret_token: secret))

spec/vcr_cassettes/discover-not-found.yml

+---
+http_interactions:
+- request:
+    method: get
+    uri: http://localhost:3000/api/v4/internal/discover?key_id=1
+    body:
+      encoding: US-ASCII
+      string: secret_token=0a3938d9d95d807e94d937af3a4fbbea%0A
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Content-Type:
+      - application/x-www-form-urlencoded
+  response:
+    status:
+      code: 404
+      message: Not Found
+    headers:
+      Cache-Control:
+      - max-age=0, private, must-revalidate
+      Content-Length:
+      - '42'
+      Content-Type:
+      - application/json
+      Date:
+      - Wed, 21 Jun 2017 10:44:49 GMT
+      Etag:
+      - W/"63b4ab301951bea83c4fc398eba8e307"
+      Vary:
+      - Origin
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Request-Id:
+      - dc11b8d4-1972-417b-8305-2c35c849405c
+      X-Runtime:
+      - '0.230170'
+    body:
+      encoding: UTF-8
+      string: '{"message":"404 Not found"}'
+    http_version: 
+  recorded_at: Wed, 21 Jun 2017 10:44:49 GMT
+recorded_with: VCR 2.4.0