MI-RUB Testing II Lecture 11

Transcription

1 MI-RUB Testing II Lecture 11 Pavel Strnad Dept. of Computer Science, FEE CTU Prague, Karlovo nám. 13, Praha, Czech Republic MI-RUB, WS 2011/12 Evropský sociální fond Praha & EU: Investujeme do vaší budoucnosti Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

2 Contents 1 Unit Testing 2 Organizing and Running Tests 3 RSpec 4 Literature Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

3 Running Tests ruby test_ roman. rb ruby test_roman. rb n test_range ruby test_ roman. rb n / range / Running Tests Use meaningful names, and you ll be able to run (for example) all the shopping-cart-related tests by simply running tests with names matching /cart/. Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

4 Where to Put Tests Project Organization Figure: The above figure is from the Programming Ruby 1.9 book. Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

5 Require Problem r e q u i r e t e s t / u n i t r e q u i r e.. / l i b / roman class TestRoman < Test : : Unit : : TestCase #... end Why doesn t this work? Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

6 Require Problem Solution r e q u i r e t e s t / u n i t r e q u i r e l i b / roman class TestRoman < Test : : Unit : : TestCase #... end ruby I. t e s t / test_roman. rb Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

7 Test Suites You can group test cases together into test suites, letting you run them all as a group. Test suites have following advantages: You can run individual tests by name. You can run all the tests in a file by running that file. You can group a number of files into a test suite and run them as a unit. You can group test suites into other test suites. Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

8 Test Suite Example # f i l e ts_dbaccess. rb r e q u i r e t e s t / u n i t r e q u i r e test_connect r e q u i r e test_query r e q u i r e test_update r e q u i r e t e s t _ d e l e t e Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

9 RSpec and Shoulda RSpec and Shoulda provides different style of testing called behavior-driven development. In many ways, this is like testing according to the content of user stories, a common requirements gathering technique in agile methodologies. In these frameworks focus is not on assertions. Instead, you should write expactations. Shoulda offers integration to Test::Unit tests. Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

10 RSpec example describe " TennisScorer ", " basic scoring " do i t " should s t a r t with a score o f 0 0" i t " should be 15 0 i f the server wins a p o i n t " i t " should be 0 15 i f the r e c e i v e r wins a p o i n t " i t " should be a f t e r they both win a p o i n t " #... end spec ts_spec. rb This file contains nothing more than a description of an aspect of the tennis scoring class (that we haven t yet written, by the way). We have written four expectations to class TennisScorer, and story basic scoring. Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

11 RSpec example r e q u i r e " t e n n i s _ s c o r e r " describe TennisScorer, " basic scoring " do i t " should s t a r t with a score o f 0 0" do t s = TennisScorer. new t s. score. should == "0 0" end i t " should be 15 0 i f the server wins a p o i n t " i t " should be 0 15 i f the r e c e i v e r wins a p o i n t " i t " should be a f t e r they both win a p o i n t " end Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

12 Exercise 2 Exercise 2 Implement class TennisScorer to pass all expectations. If you have a time implement Roman numbers :-). Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13

13 All examples are from Pavel Strnad (Czech Technical University in Prague) MI-RUB Testing II Lecture 11 MI-RUB, / 13