fix(rc): Add more unit tests for timestamp validation

Author: lahirumaramba

src/remote-config/remote-config.ts

@@ -362,8 +362,8 @@ class VersionImpl implements Version {
       this.isLegacy = version.isLegacy;
     }
 
-    // The backend API provides timestamps as ISO date strings. The Admin SDK exposes timestamps
-    // as UTC date strings. If a developer uses a previously obtained template with UTC timestamps
+    // The backend API provides timestamps in ISO date strings. The Admin SDK exposes timestamps
+    // in UTC date strings. If a developer uses a previously obtained template with UTC timestamps
     // we could still validate it below.
     if (typeof version.updateTime !== 'undefined') {
       if (!this.isValidTimestamp(version.updateTime)) {
@@ -392,6 +392,8 @@ class VersionImpl implements Version {
   }
 
   private isValidTimestamp(timestamp: string): boolean {
+    // This validation fails for timestamps earlier than January 1, 1970 and considers strings
+    // such as "1.2" as valid timestamps.
     return validator.isNonEmptyString(timestamp) && (new Date(timestamp)).getTime() > 0;
   }
 }

test/unit/remote-config/remote-config.spec.ts

@@ -681,7 +681,7 @@ describe('RemoteConfig', () => {
         });
     });
 
-    it('should resolve with template when Version updateTime contains only 3 ms places', () => {
+    it('should resolve with template when Version updateTime contains 3 fractional secs places', () => {
       const response = deepCopy(REMOTE_CONFIG_RESPONSE);
       const versionInfo = deepCopy(VERSION_INFO);
       versionInfo.updateTime = '2020-11-03T20:24:15.203Z';
@@ -707,7 +707,7 @@ describe('RemoteConfig', () => {
         });
     });
 
-    it('should resolve with template when Version updateTime contains 6 ms places', () => {
+    it('should resolve with template when Version updateTime contains 6 fractional secs places', () => {
       const response = deepCopy(REMOTE_CONFIG_RESPONSE);
       const versionInfo = deepCopy(VERSION_INFO);
       versionInfo.updateTime = '2020-11-13T17:01:36.541527Z';
@@ -732,5 +732,31 @@ describe('RemoteConfig', () => {
           expect(version.updateTime).to.equal('Fri, 13 Nov 2020 17:01:36 GMT');
         });
     });
+
+    it('should resolve with template when Version updateTime contains 9 fractional secs places', () => {
+      const response = deepCopy(REMOTE_CONFIG_RESPONSE);
+      const versionInfo = deepCopy(VERSION_INFO);
+      versionInfo.updateTime = '2020-11-13T17:01:36.541527341Z';
+      response.version = versionInfo;
+      const stub = sinon
+        .stub(RemoteConfigApiClient.prototype, operationName)
+        .resolves(response);
+      stubs.push(stub);
+
+      return rcOperation()
+        .then((template) => {
+          expect(template.etag).to.equal('etag-123456789012-5');
+
+          const version = template.version!;
+          expect(version.versionNumber).to.equal('86');
+          expect(version.updateOrigin).to.equal('ADMIN_SDK_NODE');
+          expect(version.updateType).to.equal('INCREMENTAL_UPDATE');
+          expect(version.updateUser).to.deep.equal({
+            email: '[email protected]'
+          });
+          expect(version.description).to.equal('production version');
+          expect(version.updateTime).to.equal('Fri, 13 Nov 2020 17:01:36 GMT');
+        });
+    });
   }
 });