eventbus: refactoring; add unsubscribe_method and unsubscribe_receiver (#9443)

vlib/eventbus/eventbus_test.v

@@ -4,6 +4,10 @@ struct EventData {
 	data string
 }
 
+struct FakeReceiver {
+	ok bool
+}
+
 fn test_eventbus() {
 	ev_data := &EventData{'hello'}
 	mut eb := eventbus.new()
@@ -21,8 +25,85 @@ fn test_eventbus() {
 	assert !eb.subscriber.is_subscribed('on_test')
 }
 
+fn test_subscribe_method() {
+	// Does not really test subscribe_method idinvidually though
+	// given
+	mut eb := eventbus.new()
+	r := FakeReceiver{}
+
+	assert !eb.subscriber.is_subscribed_method('on_test_with_receiver', r)
+	// when
+	eb.subscriber.subscribe_method('on_test_with_receiver', on_test_with_receiver, r)
+
+	// then
+	assert eb.subscriber.is_subscribed_method('on_test_with_receiver', r)
+}
+
+fn test_unsubscribe_method() {
+	// given
+	mut eb := eventbus.new()
+	r := FakeReceiver{}
+	r2 := FakeReceiver{}
+
+	// when
+	eb.subscriber.subscribe_method('on_test_with_receiver', on_test_with_receiver, r)
+	eb.subscriber.subscribe_method('on_test_with_receiver', on_test_with_receiver, r2)
+	eb.subscriber.unsubscribe_method('on_test_with_receiver', r)
+
+	// then
+	assert !eb.subscriber.is_subscribed_method('on_test_with_receiver', r)
+	assert eb.subscriber.is_subscribed_method('on_test_with_receiver', r2)
+}
+
+fn test_publish() {
+	// given
+	ev_data := &EventData{'hello'}
+	mut eb := eventbus.new()
+
+	// when
+	eb.subscriber.subscribe_once('on_test', on_test)
+	eb.subscriber.subscribe_once('on_test', on_test)
+	eb.publish('on_test', eb, ev_data)
+
+	// then
+	assert !eb.subscriber.is_subscribed('on_test')
+}
+
+fn test_publish_with_receiver() {
+	// given
+	mut eb := eventbus.new()
+	ev_data := &EventData{'hello'}
+	r := FakeReceiver{}
+
+	// when
+	eb.subscriber.subscribe_method('on_test_with_receiver', on_test_with_receiver, r)
+	eb.publish('on_test_with_receiver', eb, ev_data)
+
+	// then asserts are in on_test_with_receiver, don't know how to be sure
+	// that it has been properly called...
+}
+
+fn test_unsubscribe_reveiver() {
+	// given
+	mut eb := eventbus.new()
+	r := &FakeReceiver{}
+
+	// when
+	eb.subscriber.subscribe_method('on_test_with_receiver', on_test_with_receiver, r)
+	eb.subscriber.subscribe_method('on_test', on_test, r)
+	eb.subscriber.unsubscribe_receiver(r)
+	assert !eb.subscriber.is_subscribed_method('on_test_with_receiver', r)
+	assert !eb.subscriber.is_subscribed_method('on_test', r)
+}
+
 fn on_test(receiver voidptr, ev &EventData, sender voidptr) {
 	assert receiver == 0
 	assert sender != 0
 	assert ev.data == 'hello'
 }
+
+fn on_test_with_receiver(receiver &FakeReceiver, ev &EventData, sender voidptr) {
+	assert receiver.ok == false
+	assert sender != 0
+	assert ev.data == 'hello'
+}