README.md: Add test instructions
See
# machine-config-operator
-## machine-config-server
+## machine-config-operator
- Build: `WHAT=machine-config-operator ./hack/build-go.sh`
## machine-config-server
## machine-config-controller
- [Design doc](docs/MachineConfigController.md)
- `WHAT=machine-config-controller ./hack/build-go.sh`
+
+## Tests
+Tests can be executed on a per package basis with `go test` like so:
+
+`go test -v github.com/openshift/machine-config-operator/pkg/apis`
+
+All tests can be executed with:
+
+`go test -v ./...`
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