diff --git a/Makefile b/Makefile
index 04691cf7..c4fddb1d 100644
--- a/Makefile
+++ b/Makefile
@@ -77,7 +77,11 @@ format: ## Format Go source files
 .PHONY: test
 test: check-ginkgo download-tokenizer download-zmq ## Run tests
 	@printf "\033[33;1m==== Running tests ====\033[0m\n"
+ifdef GINKGO_FOCUS
+	CGO_ENABLED=1 ginkgo -ldflags="$(GO_LDFLAGS)" -v -r --focus="$(GINKGO_FOCUS)"
+else
 	CGO_ENABLED=1 ginkgo -ldflags="$(GO_LDFLAGS)" -v -r
+endif
 
 .PHONY: post-deploy-test
 post-deploy-test: ## Run post deployment tests
diff --git a/pkg/llm-d-inference-sim/simulator_test.go b/pkg/llm-d-inference-sim/simulator_test.go
index cf9fd468..88d87759 100644
--- a/pkg/llm-d-inference-sim/simulator_test.go
+++ b/pkg/llm-d-inference-sim/simulator_test.go
@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
 
 	"github.com/llm-d/llm-d-inference-sim/pkg/common"
 	. "github.com/onsi/ginkgo/v2"
@@ -754,6 +755,8 @@ var _ = Describe("Simulator", func() {
 				KVCacheTransferLatency:       2048,
 				KVCacheTransferLatencyStdDev: 2048,
 			}
+
+			common.InitRandom(time.Now().UnixNano())
 		})
 
 		DescribeTable("should calculate inter token latency correctly",