comp472-project2/test_priorityqueue.py at master · sobhan-m/comp472-project2 · GitHub

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import unittest
from priorityqueue import *

class TestPriorityQueue(unittest.TestCase):
	def test_insert(self):
		pq = PriorityQueue(lambda x: x) # Value is the same as the object.
		pq.insert(1)
		pq.insert(2)
		pq.insert(3)

		self.assertEqual(pq.length, 3)

	def test_getMin(self):
		pq = PriorityQueue(lambda x: x) # Value is the same as the object.
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.getMin(), 1)
		self.assertEqual(pq.length, 3)

		pq = PriorityQueue(lambda x: -x) # Returns max this time.
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.getMin(), 3)
		self.assertEqual(pq.length, 3)

		pq = PriorityQueue(lambda x: -(x % 3))
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.getMin(), 2)
		self.assertEqual(pq.length, 3)

	def test_removeMin(self):
		pq = PriorityQueue(lambda x: x) # Value is the same as the object.
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.removeMin(), 1)
		self.assertEqual(pq.length, 2)

		pq = PriorityQueue(lambda x: -x) # Returns max this time.
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.removeMin(), 3)
		self.assertEqual(pq.length, 2)

		pq = PriorityQueue(lambda x: -(x % 3))
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.removeMin(), 2)
		self.assertEqual(pq.length, 2)

	def test_isEmpty(self):
		pq = PriorityQueue(lambda x: x) # Value is the same as the object.
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertFalse(pq.isEmpty())
		pq.removeMin()
		self.assertFalse(pq.isEmpty())
		pq.removeMin()
		self.assertFalse(pq.isEmpty())
		pq.removeMin()
		self.assertTrue(pq.isEmpty())

	def test_getValue(self):
		pq = PriorityQueue(lambda x: x)
		pq.insert(3)
		pq.insert(2)
		pq.insert(1)

		self.assertEqual(pq.getValue(1), 1)
		self.assertEqual(pq.getValue(2), 2)
		self.assertEqual(pq.getValue(3), 3)
		self.assertIsNone(pq.getValue(5))


if __name__ == '__main__':
    unittest.main()