Whats wrong with this unit test?

   @OptIn(ExperimentalCoroutinesApi::class)
    @Test
    fun `view model test`() = runTest {
        val employees = EmployeeResponse(listOf())
        `when`(employeeRepo.getEmployees()).thenReturn(employees)

        `when`(employeeMapper.mapToState(anyList())).thenReturn(emptyList())


        val testDispatcher = StandardTestDispatcher(testScheduler)
        Dispatchers.setMain(testDispatcher)

        viewModel = EmployeeViewModel(employeeRepo, employeeMapper)
        viewModel.getEmployees()
        advanceUntilIdle()

        Assert.assertTrue(viewModel.uiState.value is EmployeeViewModel.EmployeeState.Success)

        verify(employeeRepo, times(1)).getEmployees()

        Dispatchers.resetMain()
    }

The assertion is failing because, assertion statement is executing before _uiState is executed. How to fix it?

View model code is below

 fun getEmployees() {
        val errorHandler = CoroutineExceptionHandler { _, error ->
            handleError(error)
        }
        viewModelScope.launch(errorHandler) {
            val employees = withContext(Dispatchers.IO) {
                employeeRepo.getEmployees()
            }
            _uiState.value = EmployeeState.Success(employeeMapper.mapToState(employees.employees))
        }
    }

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