Demo-Codes

Demo Codes for CS253A Course, Link

Demo for gcov tool

This demo needs g++ installed in your system. We pass flags to gcc or g++ as shown below for the file we want to test coverage on.

See the code in coverage.cpp file for more information.

$ g++ -fprofile-arcs -ftest-coverage coverage/coverage.cpp -o coverage

Running the binary produced.

$ ./coverage 
<num1> 
<num2>

or

echo -30 -55 | ./coverage

Run with more example inputs, fuzz it for better coverage.

Using gcov

Use the gcov tool with required flags for more information.

$ gcov -b -c coverage

Output

Check the file *.gcov produced.

File 'cov/coverage.cpp'
Lines executed:100.00% of 11ma
Branches executed:100.00% of 26
Taken at least once:61.54% of 26
Calls executed:100.00% of 10
Creating 'coverage.cpp.gcov'

File '/usr/include/c++/9/iostream'
No executable lines
No branches
No calls
Removing 'iostream.gcov'

Makefile gcov example

See the file in Makefile for more information.

$ make all
$ make cov1
$ make cov2

Clean up

$ make clean 

Installing googletest

You need to clone & install googletest from GitHub. This installation needs cmake & make.

• Clone the repository googletest.
• Use [cmake] to generate build & makefiles in the cloned repository.

$ cmake .
$ make -j 12

Alternately use cmake to add all dependencies, see CMakeLists.txt

• Google Test Install with cmake
• Google Test Primer

Running gtests without cmake

You can install googletest framework as described above and then run custom tests using g++/gcc directly without cmake. We show the run of a sample file example1.cpp

$ g++ src/example1.cpp -lgtest -lgtest_main -pthread
$ ./example1

There are three code examples in total.

Running gtests with cmake

Make a build directory and from that build directory, run the following commands Here cmake automatically downloads googletest repository and builds it as a dependency for your cmake project.

Using ninja build.

$  cmake .. -G "Ninja"
$ ninja all
$ ./example1

With make.

$  cmake .. 
$ make -j $(nproc)
$ ./example1