Add core-lib & core-lib-{buffers,package} unit tests + tasks

Makefile

@@ -1,7 +1,7 @@
 # Ensure emacs always runs from this makefile's PWD
 EMACS_FLAGS=--eval "(setq user-emacs-directory default-directory)"
 EMACS=emacs --batch $(EMACS_FLAGS) -l core/core.el
-
+TESTS=$(patsubst %,-l %, $(wildcard test/test-*.el))
 
 # Tasks
 all: install update autoloads
@@ -33,6 +33,12 @@ clean:
 clean-cache:
 	@$(EMACS) -f 'doom/clean-cache'
 
+test: init.el
+	@$(EMACS) -f 'doom-initialize-autoloads' -l ert $(TESTS) -f ert-run-tests-batch-and-exit
+
+test/%: init.el
+	@$(EMACS) -f 'doom-initialize-autoloads' -l ert -l $@.el -f ert-run-tests-batch-and-exit
+
 
 # Syntactic sugar for bootstrapping modules. Allows: make bootstrap javascript
 # See doom/bootstrap for more information.