fix: [billing] fixed resource_reference for name in GetProjectBillingInfo

packages/google-cloud-billing/protos/google/cloud/billing/v1/cloud_billing.proto

@@ -378,7 +378,7 @@ message GetProjectBillingInfoRequest {
   string name = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
-      type: "cloudbilling.googleapis.com/ProjectBillingInfo"
+      type: "cloudresourcemanager.googleapis.com/Project"
     }
   ];
 }

packages/google-cloud-billing/src/v1/cloud_billing_client.ts

@@ -181,6 +181,9 @@ export class CloudBillingClient {
       billingAccountPathTemplate: new this._gaxModule.PathTemplate(
         'billingAccounts/{billing_account}'
       ),
+      projectPathTemplate: new this._gaxModule.PathTemplate(
+        'projects/{project}'
+      ),
       projectBillingInfoPathTemplate: new this._gaxModule.PathTemplate(
         'projects/{project}/billingInfo'
       ),
@@ -1598,6 +1601,29 @@ export class CloudBillingClient {
     ).billing_account;
   }
 
+  /**
+   * Return a fully-qualified project resource name string.
+   *
+   * @param {string} project
+   * @returns {string} Resource name string.
+   */
+  projectPath(project: string) {
+    return this.pathTemplates.projectPathTemplate.render({
+      project: project,
+    });
+  }
+
+  /**
+   * Parse the project from Project resource.
+   *
+   * @param {string} projectName
+   *   A fully-qualified path representing Project resource.
+   * @returns {string} A string representing the project.
+   */
+  matchProjectFromProjectName(projectName: string) {
+    return this.pathTemplates.projectPathTemplate.match(projectName).project;
+  }
+
   /**
    * Return a fully-qualified projectBillingInfo resource name string.
    *

packages/google-cloud-billing/test/gapic_cloud_billing_v1.ts

@@ -1860,6 +1860,44 @@ describe('v1.CloudBillingClient', () => {
       });
     });
 
+    describe('project', () => {
+      const fakePath = '/rendered/path/project';
+      const expectedParameters = {
+        project: 'projectValue',
+      };
+      const client = new cloudbillingModule.v1.CloudBillingClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.initialize();
+      client.pathTemplates.projectPathTemplate.render = sinon
+        .stub()
+        .returns(fakePath);
+      client.pathTemplates.projectPathTemplate.match = sinon
+        .stub()
+        .returns(expectedParameters);
+
+      it('projectPath', () => {
+        const result = client.projectPath('projectValue');
+        assert.strictEqual(result, fakePath);
+        assert(
+          (client.pathTemplates.projectPathTemplate.render as SinonStub)
+            .getCall(-1)
+            .calledWith(expectedParameters)
+        );
+      });
+
+      it('matchProjectFromProjectName', () => {
+        const result = client.matchProjectFromProjectName(fakePath);
+        assert.strictEqual(result, 'projectValue');
+        assert(
+          (client.pathTemplates.projectPathTemplate.match as SinonStub)
+            .getCall(-1)
+            .calledWith(fakePath)
+        );
+      });
+    });
+
     describe('projectBillingInfo', () => {
       const fakePath = '/rendered/path/projectBillingInfo';
       const expectedParameters = {