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Good tests spur our feet,

bad tests grip like winter mud,

testing zen brings spring.

Acolyte Foo mastered the use of stubs and mocks. Soon the tests were running fast as the swiftest river.The master walked by, and deleted a swath of code: she watched as the tests passed regardless.

The next day, the other acolytes found only a straw dummy in Foo’s bed.  When they asked the master where Foo had gone, she replied: “Observe: these tests were 
Foo’s, they still pass: Foo must be alive and well”.

Thus, the acolytes gained enlightenment.