Add test for image in node status

pkg/util/rand/rand_test.go

@@ -24,6 +24,10 @@ import (
 	"testing"
 )
 
+const (
+	maxRangeTestCount = 500
+)
+
 func TestString(t *testing.T) {
 	valid := "0123456789abcdefghijklmnopqrstuvwxyz"
 	for _, l := range []int{0, 1, 2, 10, 123} {
@@ -84,3 +88,27 @@ func TestShuffle(t *testing.T) {
 		t.Errorf("Shuffle(%v) => %v, want %v", have, got, want)
 	}
 }
+
+func TestIntnRange(t *testing.T) {
+	// 0 is invalid.
+	for min, max := range map[int]int{1: 2, 10: 123, 100: 500} {
+		for i := 0; i < maxRangeTestCount; i++ {
+			inrange := IntnRange(min, max)
+			if inrange < min || inrange >= max {
+				t.Errorf("%v out of range (%v,%v)", inrange, min, max)
+			}
+		}
+	}
+}
+
+func TestInt63nRange(t *testing.T) {
+	// 0 is invalid.
+	for min, max := range map[int64]int64{1: 2, 10: 123, 100: 500} {
+		for i := 0; i < maxRangeTestCount; i++ {
+			inrange := Int63nRange(min, max)
+			if inrange < min || inrange >= max {
+				t.Errorf("%v out of range (%v,%v)", inrange, min, max)
+			}
+		}
+	}
+}