{"id":918,"date":"2015-07-13T21:00:00","date_gmt":"2015-07-13T21:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2015\/07\/13\/python-what-is-tdd-test-driven-development\/"},"modified":"2021-07-31T11:49:20","modified_gmt":"2021-07-31T11:49:20","slug":"python-what-is-tdd-test-driven-development","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html","title":{"rendered":"Python &#8211; What is TDD (Test-Driven Development) ?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6630f07a3ba04\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6630f07a3ba04\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#What_is_TDD\" title=\"What is TDD ?\">What is TDD ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#Example\" title=\"Example\">Example<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#Write_Test\" title=\"Write Test\">Write Test<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#Result\" title=\"Result\">Result<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#Write_Code\" title=\"Write Code\">Write Code<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\/#Final_Test\" title=\"Final Test\">Final Test<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_TDD\"><\/span>What is TDD ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>TDD (Test-driven development) is software design approach where your code is written around your tests.<\/p>\n<p>With TDD the test is first created, this test initially fails. The minimum amount of code is then written to ensure the test passes. This approach provides the following benefits,<\/p>\n<ul>\n<li>promotes the creation of more efficient code<\/li>\n<li>improves code quality<\/li>\n<li>ensures the minimum amount of code is used<\/li>\n<li>prevents code regression<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Example\"><\/span>Example<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Within our example we will use the Python module <span class=\"codeinline\">unittest<\/span> to show the process of creating a simple class based on TDD.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Write_Test\"><\/span>Write Test<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>First of we write our test. Our test will pass if our code returns the number 6.<\/p>\n<pre class=\"prettyprint\">import unittest\r\nfrom calculator import Calculator\r\n\r\nclass TestCalculatorCase(unittest.TestCase):\r\n\u00a0\u00a0\u00a0 def setUp(self):\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pass\r\n\u00a0\u00a0\u00a0 \r\n\u00a0\u00a0\u00a0 def test_multiply(self):\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 calc = Calculator()\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 self.assertTrue(calc.multiply(2, 3) == 6)\r\n\r\nif __name__ == '__main__':\r\n\u00a0\u00a0\u00a0 unittest.main()<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Result\"><\/span>Result<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Of course when the test is run it fails as we have yet to write any code.<\/p>\n<pre class=\"prettyprint\">======================================================================\r\nERROR: test_multiply (__main__.TestCalculatorCase)\r\n----------------------------------------------------------------------\r\nTraceback (most recent call last):\r\n File \"&lt;stdin&gt;\", line 9, in test_multiply\r\nNameError: global name 'Calculator' is not defined\r\n ----------------------------------------------------------------------\r\nRan 1 tests in 0.001s FAILED (errors=1)<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Write_Code\"><\/span>Write Code<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>We then write are code so that it passes based on our test.<\/p>\n<pre class=\"prettyprint\" style=\"line-height: 16.1000003814697px;\">class Calculator(object):\r\n\u00a0\u00a0\u00a0 def multiply(self, a, b):\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return a*b<\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Final_Test\"><\/span>Final Test<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>We then rerun our test and as we now have the required code it passes.<\/p>\n<pre class=\"prettyprint\">----------------------------------------------------------------------\r\n Ran 1 test in 0.001s\r\n OK<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>What is TDD ? TDD (Test-driven development) is software design approach where your code is written around your tests. With TDD the test is first created, this test initially fails. The minimum amount of code is then written to ensure the test passes. This approach provides the following benefits, promotes the creation of more efficient &#8230; <a title=\"Python &#8211; What is TDD (Test-Driven Development) ?\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Programming\/Python\/python-what-is-tdd-test-driven-development.html\" aria-label=\"Read more about Python &#8211; What is TDD (Test-Driven Development) ?\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python - What is TDD (Test-Driven Development) ? - Fir3net<\/title>\n<meta name=\"description\" content=\"What is TDD ? TDD (Test-driven development) is software design approach where your code is written around your tests. 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