lib/ur: Track new folder feature usage (#6803)

lib/util/utils_test.go

@@ -287,3 +287,128 @@ func TestUtilStopTwicePanic(t *testing.T) {
 	}()
 	s.Stop()
 }
+
+func TestFillNil(t *testing.T) {
+	type A struct {
+		Slice []int
+		Map   map[string]string
+		Chan  chan int
+	}
+
+	type B struct {
+		Slice *[]int
+		Map   *map[string]string
+		Chan  *chan int
+	}
+
+	type C struct {
+		A A
+		B *B
+		D *****[]int
+	}
+
+	c := C{}
+	FillNil(&c)
+
+	if c.A.Slice == nil {
+		t.Error("c.A.Slice")
+	}
+	if c.A.Map == nil {
+		t.Error("c.A.Slice")
+	}
+	if c.A.Chan == nil {
+		t.Error("c.A.Chan")
+	}
+	if c.B == nil {
+		t.Error("c.B")
+	}
+	if c.B.Slice == nil {
+		t.Error("c.B.Slice")
+	}
+	if c.B.Map == nil {
+		t.Error("c.B.Slice")
+	}
+	if c.B.Chan == nil {
+		t.Error("c.B.Chan")
+	}
+	if *c.B.Slice == nil {
+		t.Error("*c.B.Slice")
+	}
+	if *c.B.Map == nil {
+		t.Error("*c.B.Slice")
+	}
+	if *c.B.Chan == nil {
+		t.Error("*c.B.Chan")
+	}
+	if *****c.D == nil {
+		t.Error("c.D")
+	}
+}
+
+func TestFillNilDoesNotBulldozeSetFields(t *testing.T) {
+	type A struct {
+		Slice []int
+		Map   map[string]string
+		Chan  chan int
+	}
+
+	type B struct {
+		Slice *[]int
+		Map   *map[string]string
+		Chan  *chan int
+	}
+
+	type C struct {
+		A A
+		B *B
+		D **[]int
+	}
+
+	ch := make(chan int, 10)
+	d := make([]int, 10)
+	dd := &d
+
+	c := C{
+		A: A{
+			Slice: []int{1},
+			Map: map[string]string{
+				"k": "v",
+			},
+			Chan: make(chan int, 10),
+		},
+		B: &B{
+			Slice: &[]int{1},
+			Map: &map[string]string{
+				"k": "v",
+			},
+			Chan: &ch,
+		},
+		D: &dd,
+	}
+	FillNil(&c)
+
+	if len(c.A.Slice) != 1 {
+		t.Error("c.A.Slice")
+	}
+	if len(c.A.Map) != 1 {
+		t.Error("c.A.Slice")
+	}
+	if cap(c.A.Chan) != 10 {
+		t.Error("c.A.Chan")
+	}
+	if c.B == nil {
+		t.Error("c.B")
+	}
+	if len(*c.B.Slice) != 1 {
+		t.Error("c.B.Slice")
+	}
+	if len(*c.B.Map) != 1 {
+		t.Error("c.B.Slice")
+	}
+	if cap(*c.B.Chan) != 10 {
+		t.Error("c.B.Chan")
+	}
+	if cap(**c.D) != 10 {
+		t.Error("c.D")
+	}
+}