Code test coverage is a measure of whether test case execution covers various parts of the code. It is usually expressed as a percentage, indicating the proportion of the code being tested to the total code volume. Test coverage can help developers evaluate the comprehensiveness of tests and discover uncovered code areas, thereby improving the quality of software. Below are some common methods for calculating code test coverage. I hope it will be helpful to everyone. Beijing Muqi Mobile Technology Co., Ltd., a professional software outsourcing development company, welcomes exchanges and cooperation.
1. Line Coverage:
Line coverage refers to the proportion of lines of code being tested to the total lines of code.
Calculation formula: \text{line coverage} = \left( \frac{\text{number of lines of code executed}}{\text{number of total lines of code}} \right) \times 100\% line coverage= (Total lines of code Number of lines of code executed)×100%
2. Branch Coverage:
Branch coverage refers to the proportion of tested branches to the total number of branches.
Calculation formula: \text{branch coverage} = \left( \frac{\text{number of executed branches}}{\text{total number of branches}} \right) \times 100\% branch coverage = (total Number of branches Number of branches executed) × 100%
3. Function Coverage:
Function coverage refers to the proportion of tested functions to the total number of functions.
Calculation formula: \text{Function coverage} = \left( \frac{\text{Number of executed functions}}{\text{Total number of functions}} \right) \times 100\% Function coverage = (Total Number of functions Number of functions executed) × 100%
4. Statement Coverage:
Statement coverage refers to the proportion of tested statements to the total number of statements.
Calculation formula: \text{Statement coverage} = \left( \frac{\text{Number of executed statements}}{\text{Total number of statements}} \right) \times 100\% Statement coverage = (Total Number of statements Number of statements executed) × 100%
5.Instruction Coverage:
Instruction coverage refers to the proportion of tested instructions (usually machine instructions) to the total number of instructions.
Calculation formula: \text{Instruction coverage} = \left( \frac{\text{Number of instructions executed}}{\text{Total number of instructions}} \right) \times 100\% Instruction coverage = (Total Number of instructions Number of instructions executed)×100%
Test coverage tools usually automatically calculate these indicators for you. For example, when using test frameworks such as JUnit and pytest, test coverage reports are usually generated by relevant plug-ins or tools. Some popular test coverage tools include JaCoCo, istanbul, Coverage.py, etc. These tools can generate detailed reports to show which code is covered and which is not, helping developers conduct targeted testing and code improvements.