diff --git a/packages/google-cloud-webrisk/samples/generated/v1/snippet_metadata.google.cloud.webrisk.v1.json b/packages/google-cloud-webrisk/samples/generated/v1/snippet_metadata.google.cloud.webrisk.v1.json
index dc2de91964c..48c5d7f6ff8 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1/snippet_metadata.google.cloud.webrisk.v1.json
+++ b/packages/google-cloud-webrisk/samples/generated/v1/snippet_metadata.google.cloud.webrisk.v1.json
@@ -22,7 +22,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 63,
+                    "end": 66,
                     "type": "FULL"
                 }
             ],
@@ -70,7 +70,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -114,7 +114,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -158,7 +158,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.compute_threat_list_diff.js b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.compute_threat_list_diff.js
index 597c7b19a7c..56f188376ad 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.compute_threat_list_diff.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.compute_threat_list_diff.js
@@ -23,6 +23,9 @@
 function main(threatType, constraints) {
   // [START webrisk_v1_generated_WebRiskService_ComputeThreatListDiff_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.create_submission.js b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.create_submission.js
index 5f81d5c7314..f02867c1aca 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.create_submission.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.create_submission.js
@@ -23,6 +23,9 @@
 function main(parent, submission) {
   // [START webrisk_v1_generated_WebRiskService_CreateSubmission_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_hashes.js b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_hashes.js
index a43eb9d36ff..4b26a9347e0 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_hashes.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_hashes.js
@@ -23,6 +23,9 @@
 function main(threatTypes) {
   // [START webrisk_v1_generated_WebRiskService_SearchHashes_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_uris.js b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_uris.js
index 1ca2ddfe77b..3bfd8cf6bdb 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_uris.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1/web_risk_service.search_uris.js
@@ -23,6 +23,9 @@
 function main(uri, threatTypes) {
   // [START webrisk_v1_generated_WebRiskService_SearchUris_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1beta1/snippet_metadata.google.cloud.webrisk.v1beta1.json b/packages/google-cloud-webrisk/samples/generated/v1beta1/snippet_metadata.google.cloud.webrisk.v1beta1.json
index 34decea336d..3c6f6bbb2b0 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1beta1/snippet_metadata.google.cloud.webrisk.v1beta1.json
+++ b/packages/google-cloud-webrisk/samples/generated/v1beta1/snippet_metadata.google.cloud.webrisk.v1beta1.json
@@ -22,7 +22,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 60,
+                    "end": 63,
                     "type": "FULL"
                 }
             ],
@@ -70,7 +70,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -114,7 +114,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js
index 3c947259ea5..a595206ab85 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.compute_threat_list_diff.js
@@ -23,6 +23,9 @@
 function main(threatType, constraints) {
   // [START webrisk_v1beta1_generated_WebRiskServiceV1Beta1_ComputeThreatListDiff_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js
index 833229adb5b..0c13f6d0c82 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_hashes.js
@@ -23,6 +23,9 @@
 function main(threatTypes) {
   // [START webrisk_v1beta1_generated_WebRiskServiceV1Beta1_SearchHashes_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js
index a0b6bac424b..eaef0fcef14 100644
--- a/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js
+++ b/packages/google-cloud-webrisk/samples/generated/v1beta1/web_risk_service_v1_beta1.search_uris.js
@@ -23,6 +23,9 @@
 function main(uri, threatTypes) {
   // [START webrisk_v1beta1_generated_WebRiskServiceV1Beta1_SearchUris_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts b/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts
index 663c36787f7..21c9841004f 100644
--- a/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts
+++ b/packages/google-cloud-webrisk/src/v1/web_risk_service_client.ts
@@ -234,7 +234,8 @@ export class WebRiskServiceClient {
       const apiCall = this._gaxModule.createApiCall(
         callPromise,
         this._defaults[methodName],
-        descriptor
+        descriptor,
+        this._opts.fallback
       );
 
       this.innerApiCalls[methodName] = apiCall;
diff --git a/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts b/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts
index c62720e44b7..e5fd483cc86 100644
--- a/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts
+++ b/packages/google-cloud-webrisk/src/v1beta1/web_risk_service_v1_beta1_client.ts
@@ -225,7 +225,8 @@ export class WebRiskServiceV1Beta1Client {
       const apiCall = this._gaxModule.createApiCall(
         callPromise,
         this._defaults[methodName],
-        descriptor
+        descriptor,
+        this._opts.fallback
       );
 
       this.innerApiCalls[methodName] = apiCall;
diff --git a/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1.ts b/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1.ts
index 8e7670a11a7..30bce996b35 100644
--- a/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1.ts
+++ b/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1.ts
@@ -50,101 +50,103 @@ function stubSimpleCallWithCallback<ResponseType>(
 }
 
 describe('v1.WebRiskServiceClient', () => {
-  it('has servicePath', () => {
-    const servicePath =
-      webriskserviceModule.v1.WebRiskServiceClient.servicePath;
-    assert(servicePath);
-  });
-
-  it('has apiEndpoint', () => {
-    const apiEndpoint =
-      webriskserviceModule.v1.WebRiskServiceClient.apiEndpoint;
-    assert(apiEndpoint);
-  });
-
-  it('has port', () => {
-    const port = webriskserviceModule.v1.WebRiskServiceClient.port;
-    assert(port);
-    assert(typeof port === 'number');
-  });
-
-  it('should create a client with no option', () => {
-    const client = new webriskserviceModule.v1.WebRiskServiceClient();
-    assert(client);
-  });
+  describe('Common methods', () => {
+    it('has servicePath', () => {
+      const servicePath =
+        webriskserviceModule.v1.WebRiskServiceClient.servicePath;
+      assert(servicePath);
+    });
 
-  it('should create a client with gRPC fallback', () => {
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      fallback: true,
+    it('has apiEndpoint', () => {
+      const apiEndpoint =
+        webriskserviceModule.v1.WebRiskServiceClient.apiEndpoint;
+      assert(apiEndpoint);
     });
-    assert(client);
-  });
 
-  it('has initialize method and supports deferred initialization', async () => {
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has port', () => {
+      const port = webriskserviceModule.v1.WebRiskServiceClient.port;
+      assert(port);
+      assert(typeof port === 'number');
     });
-    assert.strictEqual(client.webRiskServiceStub, undefined);
-    await client.initialize();
-    assert(client.webRiskServiceStub);
-  });
 
-  it('has close method for the initialized client', done => {
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('should create a client with no option', () => {
+      const client = new webriskserviceModule.v1.WebRiskServiceClient();
+      assert(client);
     });
-    client.initialize();
-    assert(client.webRiskServiceStub);
-    client.close().then(() => {
-      done();
+
+    it('should create a client with gRPC fallback', () => {
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        fallback: true,
+      });
+      assert(client);
     });
-  });
 
-  it('has close method for the non-initialized client', done => {
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has initialize method and supports deferred initialization', async () => {
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.webRiskServiceStub, undefined);
+      await client.initialize();
+      assert(client.webRiskServiceStub);
     });
-    assert.strictEqual(client.webRiskServiceStub, undefined);
-    client.close().then(() => {
-      done();
+
+    it('has close method for the initialized client', done => {
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.initialize();
+      assert(client.webRiskServiceStub);
+      client.close().then(() => {
+        done();
+      });
     });
-  });
 
-  it('has getProjectId method', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has close method for the non-initialized client', done => {
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.webRiskServiceStub, undefined);
+      client.close().then(() => {
+        done();
+      });
     });
-    client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
-    const result = await client.getProjectId();
-    assert.strictEqual(result, fakeProjectId);
-    assert((client.auth.getProjectId as SinonStub).calledWithExactly());
-  });
 
-  it('has getProjectId method with callback', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new webriskserviceModule.v1.WebRiskServiceClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has getProjectId method', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
+      const result = await client.getProjectId();
+      assert.strictEqual(result, fakeProjectId);
+      assert((client.auth.getProjectId as SinonStub).calledWithExactly());
     });
-    client.auth.getProjectId = sinon
-      .stub()
-      .callsArgWith(0, null, fakeProjectId);
-    const promise = new Promise((resolve, reject) => {
-      client.getProjectId((err?: Error | null, projectId?: string | null) => {
-        if (err) {
-          reject(err);
-        } else {
-          resolve(projectId);
-        }
+
+    it('has getProjectId method with callback', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new webriskserviceModule.v1.WebRiskServiceClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon
+        .stub()
+        .callsArgWith(0, null, fakeProjectId);
+      const promise = new Promise((resolve, reject) => {
+        client.getProjectId((err?: Error | null, projectId?: string | null) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(projectId);
+          }
+        });
       });
+      const result = await promise;
+      assert.strictEqual(result, fakeProjectId);
     });
-    const result = await promise;
-    assert.strictEqual(result, fakeProjectId);
   });
 
   describe('computeThreatListDiff', () => {
diff --git a/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1_beta1_v1beta1.ts b/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1_beta1_v1beta1.ts
index 7a4d20faaf3..5a69d105250 100644
--- a/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1_beta1_v1beta1.ts
+++ b/packages/google-cloud-webrisk/test/gapic_web_risk_service_v1_beta1_v1beta1.ts
@@ -50,111 +50,113 @@ function stubSimpleCallWithCallback<ResponseType>(
 }
 
 describe('v1beta1.WebRiskServiceV1Beta1Client', () => {
-  it('has servicePath', () => {
-    const servicePath =
-      webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client
-        .servicePath;
-    assert(servicePath);
-  });
+  describe('Common methods', () => {
+    it('has servicePath', () => {
+      const servicePath =
+        webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client
+          .servicePath;
+      assert(servicePath);
+    });
 
-  it('has apiEndpoint', () => {
-    const apiEndpoint =
-      webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client
-        .apiEndpoint;
-    assert(apiEndpoint);
-  });
+    it('has apiEndpoint', () => {
+      const apiEndpoint =
+        webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client
+          .apiEndpoint;
+      assert(apiEndpoint);
+    });
 
-  it('has port', () => {
-    const port =
-      webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client.port;
-    assert(port);
-    assert(typeof port === 'number');
-  });
+    it('has port', () => {
+      const port =
+        webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client.port;
+      assert(port);
+      assert(typeof port === 'number');
+    });
 
-  it('should create a client with no option', () => {
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client();
-    assert(client);
-  });
+    it('should create a client with no option', () => {
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client();
+      assert(client);
+    });
 
-  it('should create a client with gRPC fallback', () => {
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        fallback: true,
-      });
-    assert(client);
-  });
+    it('should create a client with gRPC fallback', () => {
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          fallback: true,
+        });
+      assert(client);
+    });
 
-  it('has initialize method and supports deferred initialization', async () => {
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        credentials: {client_email: 'bogus', private_key: 'bogus'},
-        projectId: 'bogus',
-      });
-    assert.strictEqual(client.webRiskServiceV1Beta1Stub, undefined);
-    await client.initialize();
-    assert(client.webRiskServiceV1Beta1Stub);
-  });
+    it('has initialize method and supports deferred initialization', async () => {
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          credentials: {client_email: 'bogus', private_key: 'bogus'},
+          projectId: 'bogus',
+        });
+      assert.strictEqual(client.webRiskServiceV1Beta1Stub, undefined);
+      await client.initialize();
+      assert(client.webRiskServiceV1Beta1Stub);
+    });
 
-  it('has close method for the initialized client', done => {
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        credentials: {client_email: 'bogus', private_key: 'bogus'},
-        projectId: 'bogus',
+    it('has close method for the initialized client', done => {
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          credentials: {client_email: 'bogus', private_key: 'bogus'},
+          projectId: 'bogus',
+        });
+      client.initialize();
+      assert(client.webRiskServiceV1Beta1Stub);
+      client.close().then(() => {
+        done();
       });
-    client.initialize();
-    assert(client.webRiskServiceV1Beta1Stub);
-    client.close().then(() => {
-      done();
     });
-  });
 
-  it('has close method for the non-initialized client', done => {
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        credentials: {client_email: 'bogus', private_key: 'bogus'},
-        projectId: 'bogus',
+    it('has close method for the non-initialized client', done => {
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          credentials: {client_email: 'bogus', private_key: 'bogus'},
+          projectId: 'bogus',
+        });
+      assert.strictEqual(client.webRiskServiceV1Beta1Stub, undefined);
+      client.close().then(() => {
+        done();
       });
-    assert.strictEqual(client.webRiskServiceV1Beta1Stub, undefined);
-    client.close().then(() => {
-      done();
     });
-  });
 
-  it('has getProjectId method', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        credentials: {client_email: 'bogus', private_key: 'bogus'},
-        projectId: 'bogus',
-      });
-    client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
-    const result = await client.getProjectId();
-    assert.strictEqual(result, fakeProjectId);
-    assert((client.auth.getProjectId as SinonStub).calledWithExactly());
-  });
+    it('has getProjectId method', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          credentials: {client_email: 'bogus', private_key: 'bogus'},
+          projectId: 'bogus',
+        });
+      client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
+      const result = await client.getProjectId();
+      assert.strictEqual(result, fakeProjectId);
+      assert((client.auth.getProjectId as SinonStub).calledWithExactly());
+    });
 
-  it('has getProjectId method with callback', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client =
-      new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
-        credentials: {client_email: 'bogus', private_key: 'bogus'},
-        projectId: 'bogus',
-      });
-    client.auth.getProjectId = sinon
-      .stub()
-      .callsArgWith(0, null, fakeProjectId);
-    const promise = new Promise((resolve, reject) => {
-      client.getProjectId((err?: Error | null, projectId?: string | null) => {
-        if (err) {
-          reject(err);
-        } else {
-          resolve(projectId);
-        }
+    it('has getProjectId method with callback', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client =
+        new webriskservicev1beta1Module.v1beta1.WebRiskServiceV1Beta1Client({
+          credentials: {client_email: 'bogus', private_key: 'bogus'},
+          projectId: 'bogus',
+        });
+      client.auth.getProjectId = sinon
+        .stub()
+        .callsArgWith(0, null, fakeProjectId);
+      const promise = new Promise((resolve, reject) => {
+        client.getProjectId((err?: Error | null, projectId?: string | null) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(projectId);
+          }
+        });
       });
+      const result = await promise;
+      assert.strictEqual(result, fakeProjectId);
     });
-    const result = await promise;
-    assert.strictEqual(result, fakeProjectId);
   });
 
   describe('computeThreatListDiff', () => {