1. Testing

Types of Errors

• Syntax Errors are discovered by the interpreter as it translates source code into the byte code
• Runtime Errors arise while the programme is running
• Semantic Errors are problems with the program that do not produce error messages

Types of Testing

• Unit Testing refers to tests that evaluate specific sections of code
• Integration Testing refers to tests that evaluates the interface between components
• System Testing refers to tests that evaluate a completely integrated system

Unit Testing

• unittest is a built-in Python module that can perform unit testing in an object-oriented way

unittest - Unit testing framework - Python 3.11.0 documentation

• unittest supports the following concepts:
  • test fixture: the preparation before tests, clean-up after tests
  • test case: an individual test, checking whether the tested code produces the intended results
  • test suite: a collection of test cases
  • test runner: a component that orchestrates the execution of tests and provides the test outcome to the user

import dna
import unittest

class TestDna(unittest.TestCase):
	@classmethod
	def setUpClass(cls):
		print()
		print("setUpClass() called")
		print()

	@classmethod
	def tearDownClass(cls):
		print()
		print("tearDown() called")
		print()

	def setUp(self):
		print()
		print("setUp() called")
		print()

	def tearDown(self):
		print()
		print("tearDown() called")
		print()

	def test_find_0_(self):
		seq = list("AAAGTTAAATAATAAATAGGTGAA")
		seq_to_find = list("AAA")
		matches_sub = dna.find(seq, seq_to_find)
		matches_ans = [0, 6, 13]

		self.assertEqual(matches_sub, matches_ans)
	
	def test_find_1_(self):
		seq = list("AAAGTTAAATAATAAATAGGTGAAA")
		seq_to_find = list("AAA")
		matches_sub = dna.find(seq, seq_to_find)
		matches_ans = [0, 6, 13, 22]

		self.assertEqual(matches_sub, matches_ans)

def suit():
	suite = unittest.TestSuite()
	suite.addTest(TestDna("test_find_0_"))
	suite.addTest(TestDna("test_find_1_"))
	return suite

def main():
	runner = unittest.TextTestRunner(verbosity=2, descriptions=1)
	results = runner.run(suite())

if __name__ == "__main__":
	main()

### terminal feedback from above code

setUpClass() called

test_find_0_(__main__.TestDna) ...
setUp() called

test_find_0_ running...

tearDown() called

ok
test_find_1_(__main__.TestDna) ...
setUp() called

test_find_1_ running...

tearDown() called

ok

tearDownClass() called

2. Algorithm

<aside> 💡 Algorithms are methods for solving problems that can be implemented on a computer

</aside>

Motivation

• Algorithms can improve both the performance and resource management of our programmes