How do you define border between Unit testing and Integration testing?
Where is it exactly? In what part is layers testing ?
Related
Terminology for integration tests which test each layer and the layers below it (Jenga tests)
What is the difference between integration and unit tests?
I suggest use Apache Maven definition: those test that you run after you get your package are integration tests.
Introduction to the Build Lifecycle
package - take the compiled code and package it in its distributable format, such as a JAR.
integration-test - process and deploy the package if necessary into an environment where integration tests can be run
Then layers testing is part of Unit testing.