The Art of Unit Testing, Second Edition: with examples in C#

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• The Art of Unit Testing, Second Edition: with examples in C#

• By: Roy Osherove

• Publisher: Manning Publications

• Pub. Date: November 22, 2013

• Print ISBN-10: 1-61729-089-0

• Print ISBN-13: 978-1-61729-089-3

• Pages in Print Edition: 296

• Subscriber Rating: [4 Ratings]

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关键词：Examples example Edition TESTING editio examples

1. Definition 1.0
   
2. A unit test is a piece of a code (usually a method) that invokes another piece of code and checks the correctness of some assumptions afterward. If the assumptions turn out to be wrong, the unit test has failed. A unit is a method or function.

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1. Properties of a good unit test
   
2. A unit test should have the following properties:
   
3. 
   
4. It should be automated and repeatable.
   
5. It should be easy to implement.
   
6. It should be relevant tomorrow.
   
7. Anyone should be able to run it at the push of a button.
   
8. It should run quickly.
   
9. It should be consistent in its results (it always returns the same result if you don’t change anything between runs).
   
10. It should have full control of the unit under test.
    
11. It should be fully isolated (runs independently of other tests).
    
12. When it fails, it should be easy to detect what was expected and determine how to pinpoint the problem.

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1. Listing 2.1. The LogAnalyzer filename-validation logic to test
   
2. [Test] public void
   
3. IsValidLogFileName_GoodExtensionLowercase_ReturnsTrue()
   
4. {
   
5.     LogAnalyzer analyzer = new LogAnalyzer();
   
6.     bool result =         analyzer
   
7.           .IsValidLogFileName("filewithgoodextension.slf");
   
8. 
   
9.     Assert.True(result);
   
10. }
    
11. 
    
12. [Test]public void IsValidLogFileName_GoodExtensionUppercase_ReturnsTrue()
    
13. {
    
14.    LogAnalyzer analyzer = new LogAnalyzer();
    
15. 
    
16.    bool result =
    
17.        analyzer
    
18.        .IsValidLogFileName("filewithgoodextension.SLF");
    
19. 
    
20.    Assert.True(result);
    
21. }

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1. Listing 2.3. The LogAnalyzer filename-validation logic to test
   
2. public class LogAnalyzer
   
3.     {
   
4.         public bool IsValidLogFileName(string fileName)
   
5.         {
   
6.             ...
   
7.             if (string.IsNullOrEmpty(fileName))
   
8.             {
   
9.                 throw new ArgumentException(
   
10.                     "filename has to be provided");
    
11.             }
    
12.             ...
    
13.         }
    
14.     }

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