c# - Removing duplication in Test Driven Development -

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i developing small parser class tdd style. here tests:

    ...      [testmethod]     public void can_parse_a_float() {         initializescanner("float a");         token expectedtoken = new token("float", "a");          assert.areequal(expectedtoken, scanner.nexttoken());     }      [testmethod]     public void can_parse_an_int() {         initializescanner("int a");         token expectedtoken = new token("int", "a");          assert.areequal(expectedtoken, scanner.nexttoken());                 }      [testmethod]     public void can_parse_multiple_tokens() {         initializescanner("int float b");          token firstexpectedtoken = new token("int", "a");         token secondexpectedtoken = new token("float", "b");          assert.areequal(firstexpectedtoken, scanner.nexttoken());         assert.areequal(secondexpectedtoken, scanner.nexttoken());     }

what bugging me last test exercising same lines of code both can_parse_a_float() , can_parse_an_int(). on 1 hand, exercising both methods aren't: source code string, can several tokens. on other hand, can_parse_a_float() , can_parse_an_int() fail, can_parse_multiple_tokens() fail too.

i feel there 4 goals @ stake here:

  • i want tests show parser parses ints
  • i want tests show parser parses floats
  • i want tests show parser can parse several ints/floats in row
  • i want tests serve documentation mechanism (!)

i offering cookies shares opinions on how better approach scenario. thanks!

so, question -- did simplest thing possible when wrote code passed first 2 tests or did work ahead, knowing third requirement (test)? if wrote simplest code possible , passed third test without writing new code, test wasn't necessary. if had modify code, third test needed , served define code. yes, 3 exercising same lines of code, lines (should be) different you've written third test. see no problem this.


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