def test_get_next_None(self):
"""
Input: None
The fn get_next should raise ValueError exception.
:return: void
"""
try:
get_next(None)
self.fail()
except ValueError:
pass
def test_get_next_from_n6(self):
"""
Input: Node with value 6.
The fn get_next should return the node with value 7.
:return: void
"""
self.assertTrue(get_next(self.n6) is self.n7)
def test_get_next_from_n4(self):
"""
Input: Node with value 4.
The fn get_next should return the node with value 5.
:return: void
"""
self.assertTrue(get_next(self.n4) is self.n5)
def test_get_next_from_n1(self):
"""
Input: Node with value 1.
The fn get_next should return the node with value 2.
:return: void
"""
self.assertTrue(get_next(self.n1) is self.n2)
def test_get_next_from_n10(self):
"""
Input: Node with value 10.
The fn get_next should return None.
:return: void
"""
self.assertIsNone(get_next(self.n10))
def test_get_next_from_n8(self):
"""
Input: Node with value 8.
The fn get_next should return the node with value 9.
:return: void
"""
self.assertTrue(get_next(self.n8) is self.n9)