CodeMirror: Apex mode

@RestResource(urlMapping = '/accounts')
global with sharing class AccountsController {
  private static SoqlService soqlService = new SoqlService();

@HttpGet
global static void getActiveAccountIds() {
    RestContext.response.responseBody = Blob.valueOf(soqlService.getAllActiveAccountIds());
    RestContext.response.statusCode = 200;
  }
}

public class SoqlService {
  public SoqlService() {}

public List<String> getAllActiveAccountIds() {
    List<Account> accounts = [ SELECT Id FROM Account WHERE IsDeleted = FALSE];
    List<String> accountIds = new List<String>();
    for (Account account : accounts) {
      accountIds.add(account.Id);
    }
    return accountIds;
  }
}

@isTest
public class SoqlServiceTests {
  private static SoqlService service = new SoqlService();

@isTest static void testGetAllActiveAccountIds() {
      test.startTest();
      Account active = new Account();
      insert active;
      Account inactive = new Account();
      insert inactive;
      delete inactive;

List<String> output = service.getAllActiveAccountIds();
      System.assert(output.contains(active.Id));
      System.assert(!output.contains(inactive.Id));
      test.stopTest();
  }
}

A mode for Apex

MIME types defined: text/x-apex