[#137] Makefile: add target for testing

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

Makefile

@@ -4,7 +4,7 @@ SHELL=bash
 NEOGO?=neo-go
 VERSION?=$(shell git describe --tags)
 
-.PHONY: all build sidechain
+.PHONY: all build sidechain test
 build: all
 all: sidechain mainnet
 sidechain: alphabet morph nns
@@ -33,6 +33,9 @@ morph: $(foreach sc,$(morph_sc),$(sc)/$(sc)_contract.nef)
 mainnet: $(foreach sc,$(mainnet_sc),$(sc)/$(sc)_contract.nef)
 nns: $(foreach sc,$(nns_sc),$(sc)/$(sc)_contract.nef)
 
+test:
+	@go test ./tests/...
+
 clean:
 	find . -name '*.nef' -exec rm -rf {} \;
 	find . -name 'config.json' -exec rm -rf {} \;

README.md

@@ -67,6 +67,14 @@ $ NEOGO=/home/user/neo-go/bin/neo-go make all
 
 Remove compiled files with `make clean` or `make mr_proper` command.
 
+# Testing
+Smartcontract tests reside in `tests/` directory. To execute test suite
+after applying changes simply run `make test`.
+```
+$ make test
+ok      github.com/nspcc-dev/neofs-contract/tests       0.462s
+```
+
 # NeoFS API compatibility
 
 |neofs-contract version|supported NeoFS API versions|