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

spec/requests/api/v1/instances/activity_spec.rb

@@ -13,6 +13,9 @@ RSpec.describe 'Activity' do
         expect(response)
           .to have_http_status(200)
 
+        expect(response.content_type)
+          .to start_with('application/json')
+
         expect(response.parsed_body)
           .to be_present
           .and(be_an(Array))

spec/requests/api/v1/instances/domain_blocks_spec.rb

@@ -17,6 +17,9 @@ RSpec.describe 'Domain Blocks' do
         expect(response)
           .to have_http_status(200)
 
+        expect(response.content_type)
+          .to start_with('application/json')
+
         expect(response.parsed_body)
           .to be_present
           .and(be_an(Array))

spec/requests/api/v1/instances/extended_descriptions_spec.rb

@@ -9,6 +9,8 @@ RSpec.describe 'Extended Descriptions' do
 
       expect(response)
         .to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
 
       expect(response.parsed_body)
         .to be_present

spec/requests/api/v1/instances/languages_spec.rb

@@ -10,6 +10,8 @@ RSpec.describe 'Languages' do
 
     it 'returns http success and includes supported languages' do
       expect(response).to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
       expect(response.parsed_body.pluck(:code)).to match_array LanguagesHelper::SUPPORTED_LOCALES.keys.map(&:to_s)
     end
   end

spec/requests/api/v1/instances/peers_spec.rb

@@ -12,6 +12,8 @@ RSpec.describe 'Peers' do
 
         expect(response)
           .to have_http_status(200)
+        expect(response.content_type)
+          .to start_with('application/json')
 
         expect(response.parsed_body)
           .to be_an(Array)

spec/requests/api/v1/instances/privacy_policies_spec.rb

@@ -9,6 +9,8 @@ RSpec.describe 'Privacy Policy' do
 
       expect(response)
         .to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
 
       expect(response.parsed_body)
         .to be_present

spec/requests/api/v1/instances/rules_spec.rb

@@ -9,6 +9,8 @@ RSpec.describe 'Rules' do
 
       expect(response)
         .to have_http_status(200)
+      expect(response.content_type)
+        .to start_with('application/json')
 
       expect(response.parsed_body)
         .to be_an(Array)

spec/requests/api/v1/instances/translation_languages_spec.rb

@@ -10,6 +10,8 @@ RSpec.describe 'Translation Languages' do
 
         expect(response)
           .to have_http_status(200)
+        expect(response.content_type)
+          .to start_with('application/json')
 
         expect(response.parsed_body)
           .to eq({})
@@ -24,6 +26,8 @@ RSpec.describe 'Translation Languages' do
 
         expect(response)
           .to have_http_status(200)
+        expect(response.content_type)
+          .to start_with('application/json')
 
         expect(response.parsed_body)
           .to match({ und: %w(en de), en: ['de'] })