Improve RoutingTable#toString()

To include current timestamp. Expiration timestamp (based on TTL) can
then be compared with the current timestamp in logs.

Author: lutovich

src/v1/internal/routing-table.js

@@ -74,6 +74,7 @@ export default class RoutingTable {
   toString() {
     return `RoutingTable[` +
       `expirationTime=${this.expirationTime}, ` +
+      `currentTime=${Date.now()}, ` +
       `routers=[${this.routers}], ` +
       `readers=[${this.readers}], ` +
       `writers=[${this.writers}]]`;

test/internal/routing-table.test.js

@@ -169,8 +169,14 @@ describe('routing-table', () => {
   });
 
   it('should have correct toString', () => {
-    const table = createTable([1, 2], [3, 4], [5, 6], 42);
-    expect(table.toString()).toEqual('RoutingTable[expirationTime=42, routers=[1,2], readers=[3,4], writers=[5,6]]');
+    const originalDateNow = Date.now;
+    try {
+      Date.now = () => 4242;
+      const table = createTable([1, 2], [3, 4], [5, 6], 42);
+      expect(table.toString()).toEqual('RoutingTable[expirationTime=42, currentTime=4242, routers=[1,2], readers=[3,4], writers=[5,6]]');
+    } finally {
+      Date.now = originalDateNow;
+    }
   });
 
   function expired() {