Recently, somewhere in the Caribbean Sea, you implemented the PirateShip class. You want to test the cannons thoroughly in preparation for a clash with the East India Company. This requires that you run the crucial testFireCannonDepletesAmmunition() method many times with many different inputs. TestNG is a test framework for Java unit tests that offers additional power and ease of use over JUnit. Some of TestNG's features will help you to write your PirateShip tests in such a way that you'll be well prepared to take on the Admiral. First is the @DataProvider annotation, which allows you to add parameters to a test method and provide argument values to it from a data provider. public class PirateShipTest { @Test(dataProvider = "cannons") public void testFireCannonDepletesAmmunition(int ballsToLoad, int ballsToFire, int expectedRemaining) { PirateShip ship = new PirateShip("The Black Pearl"); ship.loadCannons(ballsToLoad); for (int i = 0; i < ballsToFire; i++) { ship.fireCannon(); } assertEquals(ship.getBallsRemaining(), expectedRemaining); } @DataProvider(name = "cannons") public Object[][] getShipSidesAndAmmunition() { // Each 1-D array represents a single execution of a @Test that refers to this // provider. The elements in the array represent parameters to the test call. return new Object[] { {5, 1, 4}, {5, 5, 0}, {5, 0, 5} }; } }
Now let's focus on making the entire test suite run faster. An old, experienced pirate draws your attention to TestNG's capacity for running tests in parallel. You can do this in the definition of your test suite (described in an XML file) with the parallel and thread-count attributes.
A great pirate will realize that this parallelization can also help to expose race conditions in the methods under test. Now you have confidence that your cannons fired in parallel will work correctly. But you didn't get to be a Captain by slacking off! You know that it's also important for your code to fail as expected. For this, TestNG offers the ability to specify those exceptions (and only those exceptions) that you expect your code to throw. @Test(expectedExceptions = { NoAmmunitionException.class }) public void testFireCannonEmptyThrowsNoAmmunitionException() { PirateShip ship = new PirateShip("The Black Pearl"); ship.fireCannon(); }
Mar 20, 2008 - TestNG's capacity for running tests in parallel. You can do this in the definition of ... in an XML file) with the parallel and thread-count attributes.
Jun 26, 2008 - "always throws an exception," "only returns a TheirEntity if the id is a prime," and so forth. These kinds of tests would've been impossible before this refactoring. More information, discussion, and archives: http://googletesting.blog
3 Apr 2008 - There are two barriers to effectively testing this method: 1. There is no easy way to test corner cases; you're at the mercy of the system clock to supply input conditions. 2. When nextMinuteFromNow() returns, the time has changed. This
Testing on the Toilet. Feb. 21, 2008. Too Many Notes Tests. In the movie Amadeus, the Austrian Emperor criticizes Mozart's music as having âtoo many notes.â How many small tests are âtoo manyâ to test one function? Consider the method decide:
Testing on the Toilet. Feb. 21, 2008. Too Many Notes Tests. In the movie Amadeus, the Austrian Emperor criticizes Mozart's music as having âtoo many notes.â How many small tests are âtoo manyâ to test one function? Consider the method decide:
Feb 7, 2008 - RED, GREEN, BLUE, ... (Try it now!) 2. ...say all 25 colors out loud: GREEN, YELLOW, WHITE... (Try it now!) Did the second task require more time and effort? If so, you're experiencing the Stroop Effect, which roughly says that when a l
Apr 17, 2008 - The callers of CreateGapLease can continue invoking it as usual, but the unit test can pass in a different path: def testCreateGapLease(self):.
Apr 17, 2008 - In this case, clearing the file at the start of the test can reduce its brittleness: def testCreateGapLease(self): if os.path.exists(lease_file):. RemoveFile(lease_file) ... Unfortunately, this doesn't completely eliminate the flakines
20 Mar 2008 - TestNG is a test framework for Java unit tests that offers additional power and ease of use over JUnit. Some of TestNG's features will help you to write your PirateShip tests in such a way that you'll be well prepared to take on the Adm
For Marco Polo in Italo Calvino's Invisible Cities,1 Venice is the one true city from whose structure all possible cities can be deduced. In that case, Venice is the reciprocal of Canberra, whose plan was abstracted from all the many actual cities, b
Jun 12, 2008 - A Stub overrides the real object and returns hard-coded values. Testing with ... implementing an in-memory database, or using a fake BigTable.
Use specifics (precise character names and events)?. YES. NO. ⢠Talk about book events in a way that suggests familiarity with causes, effects, outcomes, etc.? YES. NO. ⢠Convey maximum information with minimal words? YES. NO. ⢠Connect the ref
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questions, toss these cards into a recipe box, and then review the contents of the recipe box ... reward myself with one after each paragraph that I succeed in writing.) ... direct, thorough, and helpful feedback as students develop as writers. I als
It is used in glass and soap and paper industries. 2. It is also ...... Sometimes fruits like mango, banana, papaya, sapota and custard apple are often ripen by.
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scientific works in his maternal Catalan while, at the same time, he was deeply involved in the circulation of such works in other Romance .... Daytime telephone.
The application domain precludes the use ... Forensic writer search is similar to Information ... simple nearest-neighbour search is a viable so- .... more, given that a vector of ranks will be denoted by â, assume the availability of a rank operat
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