Test error: Component is not part of any NgModule or the module has not been imported into your module

I have two modules:

• Module A
  • Component Home
  • Component Presentation
• Module B
  • Component CustomInput

The component Presentation uses the CustomInput, so in module B, I exported CustomInputComponent, and import the module B into module A.

The problem is, in the spec file of Presentation Component, I also have to import Module B into the Test Module. And after that, I have this error:

Component HomeComponent is not part of any NgModule or the module has not been imported into your module

I really don't understand why ? Any ideas ? Thanks !