HOW TO INTERPRET THE EXPOSED RESULTS. How to increase coverage ? What does mean code coverage of 40%

Please could someone help? I dont undestand whar does mean 40% of coverage in the system

Here is the link to SonarQube metric definitions:

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My versions:


npm -version : 6.2.0
ng -version : Your global Angular CLI version (8.3.3) is greater than your local
version (8.3.1). The local Angular CLI version is used.
SonarServer : 7.8

This is my Report by i dont know ; how to get a coverage upper to 40%

How to do by

You need to have more unit tests to increase the code coverage.