Add tests for SIGKILL and 9 as well

Author: sahil1105

ipyparallel/tests/test_magics.py

@@ -523,3 +523,9 @@ def test_cellpx_keyboard_interrupt_signal_2(self):
 
     def test_cellpx_keyboard_interrupt_signal_0(self):
         self.cellpx_keyboard_interrupt_test_helper("0")
+
+    def test_cellpx_keyboard_interrupt_SIGKILL(self):
+        self.cellpx_keyboard_interrupt_test_helper("SIGKILL")
+
+    def test_cellpx_keyboard_interrupt_signal_9(self):
+        self.cellpx_keyboard_interrupt_test_helper("9")