From: legalize+jeeves@mail.xmission.com   
      
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   Ian Collins  spake the secret code   
    thusly:   
      
   >Tobias Müller wrote:   
   >> That's the point exactly. With DI you make clear which parts of the   
   >> environment you are actually using.   
   >   
   >Maybe, but setting up a mock to enable a test should also make it   
   >clear.   
      
   It does.  The problem with link-time substitution is that I can't take   
   one piece of code and make it use the link-time substitute and have   
   another piece of code that uses the real thing and have them both live   
   in the same executable.  By using link-time substitution, I'm forced   
   into having more test executables than I need.  If I use DI, then it's   
   all under control fo the test and not the *linker*.   
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