diff --git a/Makefile b/Makefile
index 99a4426..e4e707f 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ f: ## Format code
 c: ## Measure code coverage
 	go test -race -covermode=atomic ./... -coverprofile=cover.out && \
 	go tool cover -func cover.out \
-		| grep -vP '[89]\d\.\d%' | grep -v '100.0%' \
+		| grep -v '100.0%' \
 		|| true
 
-	rm cover.out
\ No newline at end of file
+	rm cover.out
diff --git a/configuration_test.go b/configuration_test.go
index 20a4ec9..8b3482d 100644
--- a/configuration_test.go
+++ b/configuration_test.go
@@ -16,3 +16,8 @@ func Test_Configuration_BucketsPowerOf2(t *testing.T) {
 		}
 	}
 }
+
+func Test_Configuration_Buffers(t *testing.T) {
+	assert.Equal(t, Configure[int]().DeleteBuffer(24).deleteBuffer, 24)
+	assert.Equal(t, Configure[int]().PromoteBuffer(95).promoteBuffer, 95)
+}