diff --git a/pkg/smb/nodeserver_test.go b/pkg/smb/nodeserver_test.go
index 1a58cb911cf..d8ca16ff9b6 100644
--- a/pkg/smb/nodeserver_test.go
+++ b/pkg/smb/nodeserver_test.go
@@ -969,3 +969,92 @@ func TestNodePublishVolumeIdempotentMount(t *testing.T) {
 	err = os.RemoveAll(targetTest)
 	assert.NoError(t, err)
 }
+
+func TestEnableGroupRWX(t *testing.T) {
+	tests := []struct {
+		value         string
+		expectedValue string
+	}{
+		{
+			value:         "qwerty",
+			expectedValue: "qwerty",
+		},
+		{
+			value:         "0111",
+			expectedValue: "0171",
+		},
+	}
+
+	for _, test := range tests {
+		mode := enableGroupRWX(test.value)
+		assert.Equal(t, test.expectedValue, mode)
+	}
+}
+
+func TestRaiseGroupRWXInMountFlags(t *testing.T) {
+	tests := []struct {
+		mountFlags         []string
+		flag               string
+		expectedResult     bool
+		mountFlagsUpdated  bool
+		expectedMountFlags []string
+	}{
+		{
+			mountFlags:     []string{""},
+			flag:           "flag",
+			expectedResult: false,
+		},
+		{
+			mountFlags:     []string{"irrelevant"},
+			flag:           "flag",
+			expectedResult: false,
+		},
+		{
+			mountFlags:     []string{"key=val"},
+			flag:           "flag",
+			expectedResult: false,
+		},
+		{
+			mountFlags:     []string{"flag=key=val"},
+			flag:           "flag",
+			expectedResult: false,
+		},
+		{
+			// This is important: if we return false here, the caller will append another flag=...
+			mountFlags:     []string{"flag=invalid"},
+			flag:           "flag",
+			expectedResult: true,
+		},
+		{
+			// Main case: raising group bits in the value
+			mountFlags:         []string{"flag=0111"},
+			flag:               "flag",
+			expectedResult:     true,
+			mountFlagsUpdated:  true,
+			expectedMountFlags: []string{"flag=0171"},
+		},
+	}
+
+	for _, test := range tests {
+		savedMountFlags := make([]string, len(test.mountFlags))
+		copy(savedMountFlags, test.mountFlags)
+
+		result := raiseGroupRWXInMountFlags(test.mountFlags, test.flag)
+		if result != test.expectedResult {
+			t.Errorf("raiseGroupRWXInMountFlags(%v, %s) returned %t (expected: %t)",
+				test.mountFlags, test.flag, result, test.expectedResult)
+		}
+
+		if test.mountFlagsUpdated {
+			if !reflect.DeepEqual(test.expectedMountFlags, test.mountFlags) {
+				t.Errorf("raiseGroupRWXInMountFlags(%v, %s) did not update mountFlags (expected: %v)",
+					savedMountFlags, test.flag, test.expectedMountFlags)
+			}
+		} else {
+			if !reflect.DeepEqual(savedMountFlags, test.mountFlags) {
+				t.Errorf("raiseGroupRWXInMountFlags(%v, %s) updated mountFlags: %v",
+					savedMountFlags, test.flag, test.mountFlags)
+			}
+		}
+	}
+}