Apex スケジューラーを使用したジョブのスケジュール

public with sharing class SomeClass implements Schedulable {
    public void execute(SchedulableContext ctx) {
        // awesome code here
    }
}

public with sharing class RemindOpptyOwners implements Schedulable {
  public void execute(SchedulableContext ctx) {
    List<Opportunity> opptys = [
      SELECT Id, Name, OwnerId, CloseDate
      FROM Opportunity
      WHERE IsClosed = FALSE AND CloseDate < TODAY
      WITH USER_MODE
    ];
    // Create a task for each opportunity in the list
    List<Task> tasks = new List<Task>();
    for (Opportunity opp : opptys) {
      Task newTask = new Task(
        Subject = 'Update the Opportunity!',
        Priority = 'Normal',
        Status = 'Not Started',
        WhatId = opp.Id
      );
      tasks.add(newTask);
    }
    insert as user tasks;
  }
}

RemindOpptyOwners reminder = new RemindOpptyOwners();
// Seconds Minutes Hours Day_of_month Month Day_of_week optional_year
String sch = '20 30 8 10 2 ?';
String jobID = System.schedule('Remind Opp Owners', sch, reminder);

@IsTest
private with sharing class RemindOppyOwnersTest {
  // Placeholder CRON expression: midnight on March 15.
  // Because this is a test, job executes
  // immediately after Test.stopTest(), not at the time set in the CRON expression
  public static String CRON_EXP = '0 0 0 15 3 ? 2042';


  @IsTest
  static void testScheduledJob() {
    // Create some out-of-date Opportunity records
    List<Opportunity> opptys = new List<Opportunity>();
    Date closeDate = Date.today().addDays(-7);
    for (Integer i = 0; i < 10; i++) {
      Opportunity o = new Opportunity(
        Name = 'Opportunity ' + i,
        CloseDate = closeDate,
        StageName = 'Prospecting'
      );
      opptys.add(o);
    }
    insert as user opptys;


    // Get the IDs of the opportunities we just inserted
    Map<Id, Opportunity> opptyMap = new Map<Id, Opportunity>(opptys);
    List<Id> opptyIds = new List<Id>(opptyMap.keySet());
    Test.startTest();
    // Schedule the test job
    String jobId = System.schedule(
      'ScheduledApexTest',
      CRON_EXP,
      new RemindOpptyOwners()
    );
    // Verify the scheduled job has not run yet.
    List<Task> lt = [
      SELECT Id
      FROM Task
      WHERE WhatId IN :opptyIds
      WITH USER_MODE
    ];
    Assert.areEqual(0, lt.size(), 'Tasks exist before job has run');
    // Stopping the test will run the job synchronously
    Test.stopTest();
    // Now that the scheduled job has executed,
    // check that our tasks were created
    lt = [
      SELECT Id
      FROM Task
      WHERE WhatId IN :opptyIds
      WITH USER_MODE
    ];
    Assert.areEqual(opptyIds.size(), lt.size(), 'Tasks were not created');


    // Check the scheduled time
    List<CronTrigger> ct = [
      SELECT Id, TimesTriggered, NextFireTime
      FROM CronTrigger
      WHERE Id = :jobId
      WITH USER_MODE
    ];
    System.debug('Next Fire Time ' + ct[0].NextFireTime);
  }
}