assets are not loaded in functional test mode

Finally, here's the solution to this problem.

I added this line to my build.sbt file :

For SBT 0.x:

unmanagedResourceDirectories in Test <+=  baseDirectory ( _ /"target/web/public/test" )

For SBT 1.x:

unmanagedResourceDirectories in Test +=  baseDirectory ( _ /"target/web/public/test" ).value

Thanks to @MarkVedder and @JarmoPertman for their great comments who put me on this solution!

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