DRA: skip flaky test case on Windows

Added a skipOnWindows flag to DynamicResources scheduler test case
to skip test that relies on nanosecond timer precision.
Windows timer granularity is much coarser than Linux, which causes
the test to fail often.

pkg/scheduler/framework/plugins/dynamicresources/dynamicresources_test.go

@@ -25,6 +25,8 @@ import (
 	"testing"
 	"time"
 
+	goruntime "runtime"
+
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/stretchr/testify/assert"
@@ -387,6 +389,7 @@ func TestPlugin(t *testing.T) {
 		enableDRAPrioritizedList         bool
 		enableDRADeviceTaints            bool
 		disableDRASchedulerFilterTimeout bool
+		skipOnWindows                    string
 	}{
 		"empty": {
 			pod: st.MakePod().Name("foo").Namespace("default").Obj(),
@@ -1041,6 +1044,10 @@ func TestPlugin(t *testing.T) {
 					status: fwk.NewStatus(fwk.Unschedulable, `still not schedulable`),
 				},
 			},
+			// Skipping this test case on Windows as a 1ns timeout is not guaranteed to
+			// expire immediately on Windows due to its coarser timer granularity -
+			// typically in the range of 0.5 to 15.6 ms
+			skipOnWindows: "coarse timer granularity",
 		},
 		"timeout_disabled": {
 			// This variant uses the normal test objects to avoid excessive runtime.
@@ -1108,6 +1115,9 @@ func TestPlugin(t *testing.T) {
 	}
 
 	for name, tc := range testcases {
+		if len(tc.skipOnWindows) > 0 && goruntime.GOOS == "windows" {
+			t.Skipf("Skipping '%s' test case on Windows, reason: %s", name, tc.skipOnWindows)
+		}
 		// We can run in parallel because logging is per-test.
 		tc := tc
 		t.Run(name, func(t *testing.T) {