Only validate GraphQL previews

.github/workflows/integration.yml

@@ -66,7 +66,7 @@ jobs:
           echo $'\u2705 Test passed' | tee -a $GITHUB_STEP_SUMMARY
 
   test-previews:
-    name: 'Integration test: previews option'
+    name: 'Integration test: GraphQL previews option'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -77,7 +77,7 @@ jobs:
         with:
           script: |
             const endpoint = github.request.endpoint
-            return endpoint({}).headers.accept
+            return endpoint({url: \"/graphql\"}).headers.accept
           result-encoding: string
       - id: previews-set-single
         name: Previews set to a single value
@@ -86,7 +86,7 @@ jobs:
           previews: foo
           script: |
             const endpoint = github.request.endpoint
-            return endpoint({}).headers.accept
+            return endpoint({url: \"/graphql\"}).headers.accept
           result-encoding: string
       - id: previews-set-multiple
         name: Previews set to comma-separated list
@@ -95,7 +95,7 @@ jobs:
           previews: foo,bar,baz
           script: |
             const endpoint = github.request.endpoint
-            return endpoint({}).headers.accept
+            return endpoint({url: \"/graphql\"}).headers.accept
           result-encoding: string
       - run: |
           echo "- Validating previews default"