code: @Test public void testOneDot(){
  {
      TargetLengthBasedClassNameAbbreviator abbreviator=new TargetLengthBasedClassNameAbbreviator(1);
      String name="hello.world";
      assertEquals("h.world",abbreviator.abbreviate(name));
    }
  {
      TargetLengthBasedClassNameAbbreviator abbreviator=new TargetLengthBasedClassNameAbbreviator(1);
      String name="h.world";
      assertEquals("h.world",abbreviator.abbreviate(name));
    }
  {
      TargetLengthBasedClassNameAbbreviator abbreviator=new TargetLengthBasedClassNameAbbreviator(1);
      String name=".world";
      assertEquals(".world",abbreviator.abbreviate(name));
    }
  }
  