[Hadoop Wiki] Update of "HowToDevelopUnitTests" by KonstantinIBoudnik

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The "HowToDevelopUnitTests" page has been changed by KonstantinIBoudnik:
http://wiki.apache.org/hadoop/HowToDevelopUnitTests?action=diff&rev1=9&rev2=10

  
  This test doesn't include any details as to why a test fails, so if you do a test run you find out the name and the line of a test and are left looking that up in the source to work out what went wrong. Some explanations help. The {{{assertEquals()}}} test will have some meaningful message, but because the variable comes before the constant, the text will be wrong.
  
- === good ===
+ === Good ===
  
  {{{
  /**