[v2] Improvements to v2 in order to have v1 wrap it.

Makefile

@@ -1,9 +1,36 @@
 .PHONY: integration integration_w_race
 
+DELAY ?= 0
+
+ifneq ($(DELAY),0)
+DELAY_FLAG=-delay $(DELAY)
+endif
+
+TAGS=integration,sftp.sync.metrics
+
 integration:
-	go test -v ./...
+	go test -v $(DELAY_FLAG) -tags=$(TAGS)
+	go test ./encoding/... ./internal/...
 	make -C localfs integration
 
 integration_w_race:
-	go test -race -v ./...
-	make -C localfs integration
+	go test -race -v $(DELAY_FLAG) -tags=$(TAGS)
+	go test -race ./encoding/... ./internal/...
+	make -C localfs integration_w_race
+
+COUNT ?= 1
+BENCHMARK_PATTERN ?= "."
+
+benchmark:
+	go test -v -run=NONE -bench=$(BENCHMARK_PATTERN) -benchmem -count=$(COUNT) $(DELAY_FLAG) -tags=$(TAGS)
+	make -C localfs benchmark
+
+benchmark_w_memprofile:
+ifneq ($(DELAY),0)
+	@echo "memprofile with DELAY produces invalid data" >&2
+	@exit 1
+endif
+	go test -v -run=NONE -bench=$(BENCHMARK_PATTERN) -benchmem -count=$(COUNT) -memprofile memprofile.out -tags=integration
+	go tool pprof -sample_index=alloc_space -svg -output=memprofile-space.svg memprofile.out
+	go tool pprof -sample_index=alloc_objects -svg -output=memprofile-allocs.svg memprofile.out
+	make -C localfs benchmark_w_memprofile