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  wait(10000);//Wait

    //Wait
    public static void wait(Integer millisec) {

        if(millisec == null || millisec < 0) {
            millisec = 0;
        }
        
        Long startTime = DateTime.now().getTime();
        Long finishTime = DateTime.now().getTime();
        while ((finishTime - startTime) < millisec) {
            //sleep for parameter x millisecs
            finishTime = DateTime.now().getTime();
        }
        // System.debug(‘>>> Done from ‘ + startTime + ‘ to ‘ + finishTime);
    }

I will share about Salesforce’s @RemoteAction.

Features

• You can execute Apex class processes from JavaScript.
• It has the same functionality as actionFunction, but you can use the return value of the process in JavaScript.

For example, you can execute a process to get accounts and use the list of accounts retrieved.

Sample code

• Apex class

 global with sharing class SampleRemoteController {
    @RemoteAction
    global static String setString(String str) {
        return  '----- ' + str + ' -----';
    }
    
    @RemoteAction
    global static List<sObject> exequery(String str){
        return Database.query(str);
    }
} 

Visualforce pages

<apex:page controller="SampleRemoteController">
    <apex:form >
        <!-- @RemoteActionSample:StringSet -->
        <apex:commandButton value=" String " onClick="return  setString('Yaho');" />
         
        <!-- @RemoteActionSample:SOQLGet -->
        <apex:commandButton value=" GetAcc " onClick="return getAcc();" />
        <hr/>
        <div id="output">Output</div>
    </apex:form>

    <script type="text/javascript">
        /*
         * @RemoteActionSample
         * StringSet
         */
        function setString(str) {
            {!$RemoteAction.SampleRemoteController.setString}(str, function(result, event){
                if(event.status) {
                    document.getElementById("output").innerHTML = result;
                }
            });
            return false;
        }
        
        /*
         * @RemoteActionSample
         * SOQLAccountGet
         */
        function getAcc() {
            var query = 'select Id,Name from Account limit 10';
            {!$RemoteAction.SampleRemoteController.exequery}(query, function(result, event){
                if(event.status) {
                    var names = '';
                    for (var i = 0; i < result.length; i++) {
                        names = names + result[i].Name + ' | ';
                    }
                    document.getElementById("output").innerHTML = names;
                }
            });
            return false;
        }
    </script>
</apex:page>                     

Methods defined as TestMethod do not support Web service callouts.

Example of an error that occurred

@isTest
private class PostTest {
    @isTest
    static void test() {

        Test.startTest();
        Service.execute();
        Test.stopTest();
    }
}

public with sharing class Service {
  @future(callout=true)
  public static void execute() {
    ServiceC sc = new ServiceC();
    sc.post();
   }

}

public with sharing class ServiceC {

  private HttpResponse post() {
    HttpRequest request = new HttpRequest();

    (omission)

    HttpResponse response = new Http().send(request);

    return response;
  }

}

Example of resolving errors

@isTest
private class PostTest {
    @isTest
    static void test() {

        Test.startTest();
        Test.setMock(HttpCalloutMock.class, new ServiceHttpCalloutMock());
        Service.execute();
        Test.stopTest();
    }
}

@isTest
public class ServiceHttpCalloutMock implements HttpCalloutMock {
  public HTTPResponse respond(HTTPRequest req) {
    HttpResponse res = new HttpResponse();
    res.setStatusCode(200);
    res.setBody('test');
    return res;
  }
}