Move tests cache clean to the bootstrap file

GNUmakefile

@@ -14,9 +14,6 @@ endif
 help: ## Display this help menu
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
 
-clean: ## Clear the application cache
-	rm -rf var/cache/test
-
 install: ## Install wallabag with the latest version
 	@./scripts/install.sh $(ENV)
 
@@ -34,7 +31,7 @@ build: ## Run webpack
 	@yarn install
 	@yarn build:$(ENV)
 
-prepare: clean ## Prepare database for testsuite
+prepare: ## Prepare database for testsuite
 ifdef DB
 	cp app/config/tests/parameters_test.$(DB).yml app/config/parameters_test.yml
 endif
@@ -57,6 +54,6 @@ endif
 deploy: ## Deploy wallabag
 	@bundle exec cap staging deploy
 
-.PHONY: help clean prepare install fixtures update build test release deploy run dev
+.PHONY: help prepare install fixtures update build test release deploy run dev
 
 .DEFAULT_GOAL := install

tests/bootstrap.php

@@ -1,3 +1,7 @@
 <?php
 
+use Symfony\Component\Filesystem\Filesystem;
+
 require __DIR__ . '/../vendor/autoload.php';
+
+(new Filesystem())->remove(__DIR__ . '/../var/cache/test');