tests/test-install.t

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hg debuginstall
  $ hg debuginstall
  Checking encoding (ascii)...
  Checking installed modules (*mercurial)... (glob)
  Checking templates (*mercurial?templates)... (glob)
  Checking commit editor...
  Checking username...
  No problems detected

hg debuginstall with no username
  $ HGUSER= hg debuginstall
  Checking encoding (ascii)...
  Checking installed modules (*mercurial)... (glob)
  Checking templates (*mercurial?templates)... (glob)
  Checking commit editor...
  Checking username...
   no username supplied (see "hg help config")
   (specify a username in your configuration file)
  1 problems detected, please check your install!
  [1]