✅ Add test for invalid response

Author: fabsrc

src/__tests__/diff.test.ts

@@ -116,6 +116,17 @@ describe('getDiff', () => {
       ).rejects.toThrow(`404 - Not Found (${testRemoteSchemaLocation})`);
     });
 
+    it('throws error on invalid response', () => {
+      nock(testRemoteSchemaLocation)
+        .post('', JSON.stringify({ query: introspectionQuery }))
+        .twice()
+        .reply(200, { invalid: 'response' });
+
+      return expect(
+        getDiff(testRemoteSchemaLocation, testRemoteSchemaLocation)
+      ).rejects.toThrow(`Invalid response from GraphQL endpoint: ${testRemoteSchemaLocation}`);
+    });
+
     afterEach(() => {
       nock.cleanAll();
     });

src/diff.ts

@@ -37,7 +37,7 @@ async function fetchRemoteSchema(
   }
 
   const responseBody = await res.json();
-  
+
   if (!responseBody || !responseBody.data || !responseBody.data.__schema) {
     throw new Error(`Invalid response from GraphQL endpoint: ${endpoint}`);
   }