Fix absolute path configuration

- add all paths that should be available in the test folder to tsconfig.test.json
("extending" the list of paths from the parent config file is not enough)

test/tsconfig.json

@@ -2,7 +2,10 @@
 	"extends": "../tsconfig.json",
 	"compilerOptions": {
 		"paths": {
-			"@banners/*": [ "banners/*" ]
+			"@banners/*": [ "banners/*" ],
+			"@test/*": [ "test/*" ],
+			"@src/*": [ "src/*" ],
+			"@environment/*": [ "src/environment/prod/*", "src/environment/dev/*" ]
 		}
 	}
 }