If you follow the local installation instructions as in: "If you want to try without docker, you might run into the problem of moving targets for CppUTest, gcc and clang."
You will ran into a make error.
tddec-code/Makefile requires the cpputest to be in tddec-code/cpputest
following the git clone instructions solves the problem:
MYPROJECTS=myprojects
mkdir -p $MYPROJECTS
cd $MYPROJECTS
git clone --recurse-submodules https://github.com/jwgrenning/tddec-code.git
WORKING_DIR=$MYPROJECTS/tddec-code
export CPPUTEST_HOME=$WORKING_DIR/cpputest
cd $WORKING_DIR
make