fix(makefile): increase timeout for tests

Signed-off-by: Simon Delberghe <open-source@orandin.fr>

Makefile

@@ -4,8 +4,8 @@ MAIN_LOCATION	= ./cmd
 
 TEST_LOCATION	= ./...
 # timeout for go test is here to prevent tests running infinitely if one runResolution leads to a step that never recovers (e.g. missing push on a stepChan)
-# 15 seconds per unit tests should be enough
-TEST_CMD		= go test -count=1 -timeout 15s -v -cover -p 1 ${TEST_LOCATION}
+# 30 seconds per unit tests should be enough
+TEST_CMD		= go test -count=1 -timeout 30s -v -cover -p 1 ${TEST_LOCATION}
 TEST_CMD_COV	= ${TEST_CMD} -covermode=count -coverprofile=coverage.out
 
 SOURCE_FILES 	= $(shell find ./ -type f -name "*.go" | grep -v _test.go)