Fighters
What is the test service unit known as?
Battle of Britain
Unit root test Visual Studio Unit Testing Framework Software verification Device under test Unit testing frameworks for Ruby
Unit_root_test-Abstract Visual_Studio_Unit_Testing_Framework-Test_method Software_verification-Dynamic_verification_(Test,_experimentation) Device_under_test-Abstract Unit_testing_frameworks_for_Ruby-Installing_Test::Unit
In statistics, a unit root test tests whether a time series variable is non-stationary using an autoregressive model. A well-known test that is valid in large samples is the augmented Dickey–Fuller test. The optimal finite sample tests for a unit root in autoregressive models were developed by Denis Sargan and Alok Bhargava. Another test is the Phillips–Perron test. These tests use the existence of a unit root as the null hypothesis. 
Test methods are declared as such by decorating a unit test method with the TestMethod attribute. The attribute is used to identify methods that contain unit test code. Best practices state that unit test methods should contain only unit test code. 
Dynamic verification is performed during the execution of software, and dynamically checks its behaviour; it is commonly known as the Test phase. Verification is a Review Process. Depending on the scope of tests, we can categorize them in three families:  "Test in the small": a test that checks a single function or class (Unit test)  "Test in the large": a test that checks a group of classes, such as * Module test (a single module) * Integration test (more than one module) * System test (the entire system)  "Acceptance test": a formal test defined to check acceptance criteria for a software * Functional test * Non functional test (performance, stress test) Software verification is often confused with software validation. The difference between "verification" and "validation":  Software "verification" asks the question, "Are we building the product right? "; that is, does the software conform to its specification. Software "validation" asks the question, "Are we building the right product? "; that is, is the software doing what the user really requires. The aim of software verification is to find the errors introduced by an activity, i.e. check if the product of the activity is as correct as it was at the beginning of the activity. 
Device under test (DUT), also known as equipment under test (EUT) and unit under test (UUT), is a term commonly used to refer to a manufactured product undergoing testing. 
Installing Test::Unit. All Ruby versions comes preinstalled with Test::Unit framework. of Ruby 1.9.3 test/unit is not preinstalled, but is available as a gem. 