CppUnit and Vim

CppUnit and Vim 56

Posted by tottinger Fri, 04 May 2007 02:54:00 GMT

I’m playing with ways to make CPPUNIT and VIM a bit more agile for my C++ teams.

I’ve been hearing about great lengths people go to, flipping back and forth between .h and cpp for the tests or writing perl scripts to coalesce them together. I’m too simple-minded for that. I figure nobody wants to #include my tests, so I don’t need a .h. I do it all in the .cpp file, all inline. It works fine. This way, everything is in one place. I don’t have to jump up to the header file to add a protoype and then down to the implementation to add the CPPUNIT_TEST line, and then back down to my code to enter it. I have no .h, so no prototype. Inline makes it a bit more like pyunit or junit.

I grokked the CompilerOutputter pretty quick. If you use the quickfix mode (and esp if you use :cw) you will definitely want the CompilerOutputter. I like the way it helps me move from testing error to testing error (err.. if there were ever more than one), just as it does with compile errors (errr. if they happen. They do). I set up my makefiles to run the tests, so there’s no additional step required. That’s handy. I also have the makefile run ctags to make my navigation nice and easy.

Still, adding and removing tests takes some effort. I figure VIM can take up the slack. I have macros to start up a new test file (F2), to add a test class(F11), to register a function(F12), and to delete a function and its CPPUNIT_TEST line (F9) .

I also abbreviate most of the macros that I would otherwise have to type. I am thinking about remapping them maybe to more memorable values, but it helps.

There are probably a lot more elegant ways to do this. I can’t wait to hear about them.

 " Add methods to help create CPPUNIT classes
function! NewCppUnitFile()
    call NewCppUnitClass()
    0r~/.cppunit_file_template.vim
endfunction

function! NewCppUnitClass() 
    r~/.cppunit_class_template.vim
    let name = input("Name your new test class: ")
    exec "%s/@@@NAMEHERE@@@/" . name . "/g" 
endfunction

nmap <F2> :call NewCppUnitFile()<CR>
nmap <F9>  ^f(b*ddN0d/{<CR>d%
nmap <F11> G:call NewCppUnitClass()<CR>
nmap <F12> ebmz"zyw?CPPUNIT_TEST_SUITE_END(<CR>OCPPUNIT_TEST(<C-R>z);<ESC>'z

" CPPUnit abbreviations
ab cas CPPUNIT_ASSERT
ab cam CPPUNIT_ASSERT_MESSAGE
ab cfa CPPUNIT_FAIL
ab caf CPPUNIT_FAIL
ab cae CPPUNIT_ASSERT_EQUAL
ab cat CPPUNIT_ASSERT_THROW
ab cde CPPUNIT_ASSERT_DOUBLES_EQUAL

The current rhythm is to open a new file and press F2. F2 calls NewCppUnitFile, which sucks in my file header template. It’s pretty bare, but it can be edited to taste. Mostly it helps me remember what to include.

    #include <cppunit/TestFixture.h>
    #include <cppunit/extensions/HelperMacros.h>

Then I give the name of my first test class. I get a starter class. I can then add it to the makefile (note to self: automate the makefile bit). the starter template I have has a dummy test, so I can run it and see if it fails. Failing means it’s being built and run.

    class @@@NAMEHERE@@@: public CPPUNIT_NS::TestFixture {
        CPPUNIT_TEST_SUITE(@@@NAMEHERE@@@);
        CPPUNIT_TEST(shouldFailAsEvidenceThisMethodIsRegistered);  // DELETEME?
        CPPUNIT_TEST_SUITE_END();

        public:
            void setUp() {
            }
            void tearDown() {
            }
        protected:
            void shouldFailAsEvidenceThisMethodIsRegistered() { // DELETEME?
                CPPUNIT_FAIL("This function is registered and can be deleted");
            }
    };
    CPPUNIT_TEST_SUITE_REGISTRATION(@@@NAMEHERE@@@);

Substitution is automagical. the @@NAMEHERE@@ is the magic pattern being replaced with test names.

A nice thing about macros is that they’re atomic. If I hate the name I gave my test, I press ‘u’ for undo, and it vanishes. Back to empty file. :-)

If the ”:mak” works and I get the inevitable failure in the “shouldFail” method, I put my cursor on the “void shouldFail…” line and press F9. In the wink of an eye, the method and its CPPUNIT_TEST line both vanish. Again, macros are atomic, so if I delete the wrong thing, I just press ‘u’ for undo and both the function and its registration reappear.

No flipping between files, no scrolling up and down. We have software to do that now.

I add a method under “protected”. I put the mouse on the method name and press F12 to add the CPPUNIT_TEST for it above. I add some more text. When I get to the part where I need to assert, I use one of the abbreviations. If I’m in insert mode and type “cae(” I get “CPPUNIT_ASSERT_EQUALS(”. I don’t have to remember whether it ends in an S or not. I actually struggle with that, sad thing that I am.

I can press F11 to create more test classes. I like to keep a test class for every circumstance (setup) I am using. I don’t mind at all having multiple tests per .cpp file. I like to group the tests together in files. After all, quickfix knows where the code is. This is actually one of the reasons I like to keep using CppUnit. I’ll have to tell the others someday.

Well, that’s how I do it. You don’t have to, but you could try it. If you find any errors, or glaring omissions, please mail them to me or comment here. In return, I will claim my actual scripts are perfect and blame it on the web master. ;-)

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Philipp Sieweck about 10 hours later:

A nice way to quickly insert smart templates is the snippets vimscript (http://www.vim.org/scripts/script.php?script_id=1318). Now you have a Textmate-like template system. It would be cool to define some snippets for cppunit or other unittesting frameworks.
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I don’t have to jump up to the header file to add a protoype and then down to the implementation to add the PPUNIT_TEST line, and then back down to my code to enter it. I have no .h, so no prototype. Inline makes it a bit more like pyunit or junit.
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CppUnit and Vim 56

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