improve coverage of Slot class

Author: tiagoschenkel

test/org/osflash/signals/SlotTest.test.ts

@@ -69,6 +69,13 @@ describe("SlotTest", () => {
         assert.deepEqual(received, expected);
     });
 
+    it("execute0_with_once_enabled_should_remove_listener", () => {
+        expected = [];
+        slot = new Slot(listener0, signal, true);
+        slot.execute0();
+        assert.deepEqual(received, expected);
+    });
+
     it("execute1_should_not_call_listener_when_disabled", () => {
         slot = new Slot(listener1, signal);
         slot.enabled = false;
@@ -100,6 +107,13 @@ describe("SlotTest", () => {
         assert.deepEqual(received, expected);
     });
 
+    it("execute1_with_once_enabled_should_remove_listener", () => {
+        expected = [42];
+        slot = new Slot(listener1, signal, true);
+        slot.execute1(expected[0]);
+        assert.deepEqual(received, expected);
+    });
+
     it("execute_should_not_call_listener_when_disabled", () => {
         slot = new Slot(listener0, signal);
         slot.enabled = false;