Page 1 Pros and Cons of Sandwich Testing Top and Bottom Layer Tests - PDF document

Podcast Ch11-04 ♦ Title : Sandwich Testing ♦ Description : Sandwich Testing Strategy, Pros and Cons of Sandwich Testing, Modified Sandwich Testing ♦ Participants : Barry Kurtz (instructor); Brandon Winters, Sara Hyde, Cheng Vue, Dan Baehr (students) ♦ Textbook : Object-Oriented Software Engineering: Using UML, Patterns and Java by Bernd Bruegge and Allen H. Dutoit Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 1 Sandwich Testing Strategy ♦ Combines top-down strategy with bottom-up strategy ♦ The system is view as having three layers � A target layer in the middle � A layer above the target � A layer below the target � Testing converges at the target layer ♦ How do you select the target layer if there are more than 3 layers? � Heuristic: Try to minimize the number of stubs and drivers Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 2 Sandwich Testing Strategy A Layer I B C D Layer II G E F Test E Layer III Test B, E, F Bottom Test F Layer Tests Test A, B, C, D, Test D,G E, F, G Test G Test A,B,C, D Top Test A Layer Tests Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 3 Page 1

Pros and Cons of Sandwich Testing ♦ Top and Bottom Layer Tests can be done in parallel ♦ Does not test the individual subsystems thoroughly before integration ♦ Solution: Modified sandwich testing strategy Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 4 Modified Sandwich Testing Strategy ♦ Test in parallel: � Middle layer with drivers and stubs � Top layer with stubs � Bottom layer with drivers ♦ Test in parallel: � Top layer accessing middle layer (top layer replaces drivers) � Bottom accessed by middle layer (bottom layer replaces stubs) Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 5 Modified Sandwich Testing Strategy Double Double Test I Test I A Layer I Test B B C D Layer II Test E Triple F G Triple E Layer III Triple Triple Test I Test I Test B, E, F Test I Test I Double Double Test II Test II Test F Test Test D A, B, C, D, Double Double Test D,G E, F, G Test II Test II Test G Test A,C Test A Test C Double Double Test I Test I Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 6 Page 2

Exercise ch11-04-01 A B C D E F G H I J ♦ Specify a test plan for the following components using a sandwich testing strategy ♦ Specify a test plan using a modified sandwich testing strategy Bernd Bruegge & Allen H. Dutoit Object-Oriented Software Engineering: Using UML, Patterns, and Java 7 Page 3