Unable to mock Scala object

[pforpramit]

I have started working in Scala very recently. I have below code in the main method that I'll need to mock for writing test cases,

object SacSAAgentSoftwareLogParser extends SparkSessionCreation {

  def main(args: Array[String]): Unit = {

      secret = mapAsJavaMap(SecretConfig.apply())
      
      ...
      

Here is how the object SecretConfig is defined. It reads configs from HC Vault.

object SecretConfig {

  def apply(): collection.Map[String, String] = {
  
  ...

In the test case, I am trying to mock the SecretConfig.apply() so that it does not make a real-time call while executing the same -

class SacSAAgentSoftwareLogParserTest extends AnyFlatSpec with Matchers with MockitoSugar {

  "SacSAAgentSoftwareLogParser" should "execute the main method and process data correctly" in {
  
  val intermediateSecretMap: collection.Map[String, String] = Map( "secret1" -> "value1")
  
      withObjectMocked[SecretConfig.type] {
      when(SecretConfig.apply()).thenReturn(intermediateSecretMap)
    }

    ...

SacSAAgentSoftwareLogParser.main(Array.empty)
    ...

However, the mocking does not really work while running the test case. Instead, it goes on to call the SecretConfig.apply() in real time. I have added that mock-maker-inline thing in src -> test -> resources -> mockito-extensions -> org.mockito.plugins.MockMaker.

Definitely I'm doing some mistakes here, just not able to figure out what they are. There might be some gap in my understandings as well.