Makefile: add target for testing generic implementation

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

.github/workflows/run_tests.yml

@@ -90,3 +90,6 @@ jobs:
 
       - name: Run tests
         run: go test -v ./...
+
+      - name: Run generic tests
+        run: go test -v -count=1 ./... --tags=generic

Makefile

@@ -47,3 +47,10 @@ up: down deps
 attach:
 	@echo "\n${B}${G} attach to hash-container ${R}\n"
 	@time docker exec -it --name hash-demo /bin/sh
+
+# Test code with all backends
+test:
+	go test ./...
+
+test.generic:
+	go test ./... --tags=generic