Added new changeElectionEndDate in client for changing the election…

… end date directly by providing a date.

src/client.ts

@@ -772,6 +772,25 @@ export class VocdoniSDKClient {
       .then((hash) => this.chainService.waitForTransaction(hash));
   }
 
+  /**
+   * Changes the end date of an election.
+   * @category Election
+   *
+   * @param electionId - The id of the election
+   * @param endDate - The new end date
+   */
+  public changeElectionEndDate(electionId: string, endDate: string | number | Date): Promise<void> {
+    const date = new Date(endDate);
+    invariant(date instanceof Date, 'Date not valid');
+    if (!this.electionId && !electionId) {
+      throw Error('No election set');
+    }
+
+    return this.fetchElection(electionId ?? this.electionId).then((election) =>
+      this.changeElectionDuration(electionId ?? this.electionId, date.getTime() - election.startDate.getTime())
+    );
+  }
+
   /**
    * Checks if the user is in census.
    * @category Voting

test/integration/election.test.ts

@@ -1396,7 +1396,7 @@ describe('Election integration tests', () => {
 
     await client.createAccount();
 
-    let account, publishedElection;
+    let account, publishedElection, changedDate;
 
     await client
       .createElection(election)
@@ -1413,6 +1413,7 @@ describe('Election integration tests', () => {
       })
       .then(() => client.fetchElection())
       .then(async (election) => {
+        changedDate = election.endDate;
         expect(new Date(publishedElection.endDate).getTime()).toBeLessThan(new Date(election.endDate).getTime());
         expect(new Date(election.endDate).getTime()).toBeGreaterThan(
           new Date(publishedElection.endDate).getTime() + startDateStride + 60 * 60
@@ -1421,6 +1422,14 @@ describe('Election integration tests', () => {
         await expect(async () => {
           await client.changeElectionDuration(election.id, -(startDateStride + 60 * 60));
         }).rejects.toThrow();
+        return client.changeElectionEndDate(
+          election.id,
+          new Date(election.startDate.getTime() + startDateStride + 60 * 60 + 1)
+        );
+      })
+      .then(() => client.fetchElection())
+      .then(async (election) => {
+        expect(new Date(changedDate).getTime()).toBe(new Date(election.endDate).getTime() - 1000);
       });
   }, 185000);
 });