Enable the Makefile to run tests

Makefile.am

@@ -11,7 +11,23 @@ SOURCES =			\
   knots/web-server.scm		\
   knots/worker-threads.scm
 
+SCM_TESTS =			\
+  tests/non-blocking.scm	\
+  tests/promise.scm		\
+  tests/timeout.scm		\
+  tests/non-blocking.scm	\
+  tests/queue.scm		\
+  tests/web-server.scm		\
+  tests/parallelism.scm	\
+  tests/resource-pool.scm	\
+  tests/worker-threads.scm
+
+TESTS_GOBJECTS = $(SCM_TESTS:%.scm=%.go)
+
 EXTRA_DIST =		\
   README		\
   bootstrap		\
   pre-inst-env.in
+
+check: $(GOBJECTS) $(TESTS_GOBJECTS)
+	find tests -name "*.scm" | xargs -t -L1 ./test-env guile