Add response.content_type checks for JSON to api/v1 request specs (#31981)

spec/requests/api/v1/admin/trends/links/links_spec.rb

@@ -18,6 +18,8 @@ RSpec.describe 'Links' do
       subject
 
       expect(response).to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
     end
   end
 
@@ -36,6 +38,8 @@ RSpec.describe 'Links' do
         .to change_link_trendable_to_true
 
       expect(response).to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
       expects_correct_link_data
     end
 
@@ -60,6 +64,8 @@ RSpec.describe 'Links' do
         post '/api/v1/admin/trends/links/-1/approve', headers: headers
 
         expect(response).to have_http_status(404)
+        expect(response.content_type)
+          .to start_with('application/json')
       end
     end
 
@@ -70,6 +76,8 @@ RSpec.describe 'Links' do
         subject
 
         expect(response).to have_http_status(403)
+        expect(response.content_type)
+          .to start_with('application/json')
       end
     end
   end
@@ -89,6 +97,8 @@ RSpec.describe 'Links' do
         .to_not change_link_trendable
 
       expect(response).to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
     end
 
     def change_link_trendable
@@ -114,6 +124,8 @@ RSpec.describe 'Links' do
         post '/api/v1/admin/trends/links/-1/reject', headers: headers
 
         expect(response).to have_http_status(404)
+        expect(response.content_type)
+          .to start_with('application/json')
       end
     end
 
@@ -124,6 +136,8 @@ RSpec.describe 'Links' do
         subject
 
         expect(response).to have_http_status(403)
+        expect(response.content_type)
+          .to start_with('application/json')
       end
     end
   end