How can we manually cover the catch block(in try catch block) in apex test class?

Hi Mohit,

To cover the catch block you have to throw the exception in your test class. Sample for the callout exception.

System.CalloutException in your mock:

@TestVisible class UnauthorizedEndpointResponse implements HttpCalloutMock {
public HttpResponse respond(HttpRequest request) {
CalloutException e = (CalloutException)CalloutException.class.newInstance();
e.setMessage('Unauthorized endpoint, please check Setup->Security->Remote site settings.');
throw e;
}
}

Then cause it to appear in your test with the normal HTTP mocks:

Test.setMock(HttpCalloutMock.class, new UnauthorizedEndpointResponse());
BatchClass.doTheCallout();