I'm trying to understand if i need to have a covid test? or just self isolate? i have mild symptons

Yes both: If you have any cold symptoms, test and isolate until well and without fever. Treat symptoms and rest. If symptoms worsen, see an acute care center.

COVID 19 testing: In South Africa a medical provider will determine need for COVID 19 testing. Consult your local primary care provider or you can use telemedicine (to include HealthTap’s telemedicine format) for individual consultations. There are a number of free apps to look at your risk. Some quarantine for the period required in South Africa without testing.