workbin

I use https://github.com/tpope/vim-markdown to write markdown files. And use http://fletcherpenney.net/multimarkdown/ to 'compile' the markdown file. To check the rendered output I have a key mapping to compile the current markdown file and open the generated html file.

Why did you rule out using Google Test (https://code.google.com/p/googletest)?

(In case you mulled over using it.)

I usually provide an estimate of the time it would take me to come up for an estimate of the whole project.

Pushing for a 2 level estimation is definitely not easy, and if the person on the other side of the negotiation refuses this, then I ask him/her to stop playing the "Price is right" and spit out his time requirement already.