Test Coverage

Test coverage refers to the measurement of how much of your code is covered by tests. It helps you identify areas of your codebase that are not tested and may have a higher chance of containing bugs.

To calculate test coverage, you can use tools like Istanbul, which generates a report showing the percentage of code covered by tests.

By striving for high test coverage, you can increase the confidence in your code quality and catch potential issues before they reach production.

Here's an example of a basic addition function:

1const add = (a, b) => {
2  return a + b;
3};
4
5console.log(add(2, 3)); // Output: 5

To ensure proper test coverage, you would write tests for this function to validate different scenarios, such as testing for positive and negative numbers or edge cases.

Improving test coverage involves analyzing your codebase, identifying untested areas, and creating additional tests to cover those areas.

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const add = (a, b) => {

  return a + b;

};

​

console.log(add(2, 3));