What does GCOV do?

Gcov is a source code coverage analysis and statement-by-statement profiling tool. Gcov generates exact counts of the number of times each statement in a program is executed and annotates source code to add instrumentation. Gcov comes as a standard utility with the GNU Compiler Collection (GCC) suite.

How do you use GCOV?

To use Gcov, perform the following steps:

1. Compile the code with the -fprofile-arcs and -ftest-coverage flags, for example: $ gcc -fprofile-arcs -ftest-coverage test.c.
2. Run the instrumented binary and perform functional testing.
3. Generate a report file based on the data that is stored in the profile output files:

How do I enable GCOV on Linux?

Using gcov-kernel (Linux 2.6. 30 and below)

1. Obtain the Linux kernel source code.
2. Obtain and apply the corresponding gcov-kernel patch.
3. Enable the gcov-kernel configuration options: CONFIG_GCOV_PROFILE=y CONFIG_GCOV_ALL=y CONFIG_GCOV_PROC=y.
4. Compile, install and boot the kernel.

What is the output of GCOV?

When you use the -b option, your output looks like this: $ gcov -b tmp. c 90.00\% of 10 source lines executed in file tmp. c 80.00\% of 5 branches executed in file tmp….OPTIONS.

Tag	Description
-n
–no-output	Do not create the gcov output file.
-l

How do I use GCOV in Visual Studio?

Gcov is a tool you can use in conjunction with GCC to test code coverage in your programs….Gcov Viewer

1. Compile your code with gcc / g++ (version >= 9) with –coverage and without optimizations.
2. Run your program or tests.
3. Open a source file in vscode and use ctrl+shift+P to run the Gcov Viewer: Show command.

How is code coverage calculated?

How is it measured? To calculate the code coverage percentage, simply use the following formula: Code Coverage Percentage = (Number of lines of code executed by a testing algorithm/Total number of lines of code in a system component) * 100.

What is good code coverage?

With that being said it is generally accepted that 80\% coverage is a good goal to aim for. Trying to reach a higher coverage might turn out to be costly, while not necessary producing enough benefit. The first time you run your coverage tool you might find that you have a fairly low percentage of coverage.

How many test cases are enough?

In order to fully test that all the requirements of an application are met, there must be at least two test cases for each requirement: one positive test and one negative test. If a requirement has sub-requirements, each sub-requirement must have at least two test cases.

Which tool is used for code coverage?

Cobertura. Cobertura is an open-source tool for measuring code coverage. It does so by instrumenting the byte code.

What is UT code coverage?

If you already have a project, you can skip ahead to the Code coverage tooling section. Unit tests help to ensure functionality and provide a means of verification for refactoring efforts. Code coverage is a measurement of the amount of code that is run by unit tests – either lines, branches, or methods.