Add section about unit tests

README.md

@@ -350,3 +350,27 @@ kubectl port-forward POD_NAME DLV_PORT:DLV_PORT
 ```
 $ dlv connect 127.0.0.1:DLV_PORT
 ```
+
+### Unit tests
+
+To run all unit tests, you can simply do:
+
+```
+go test ./...
+```
+
+For go 1.9 `vendor` directory would be excluded automatically. For previous
+versions you can exclude it manually:
+
+```
+go test (glide novendor)
+```
+
+In case if you need to debug your unit test, it's possible to use delve:
+
+```
+$ dlv test ./pkg/util/retryutil/
+Type 'help' for list of commands.
+(dlv) c
+PASS
+```