test/e2e: allocate dynamic ports outside whitelist ranges in server whitelist test (#5268)

test/e2e/framework/framework.go

@@ -241,6 +241,31 @@ func (f *Framework) AllocPort() int {
 	return port
 }
 
+func (f *Framework) AllocPortExcludingRanges(ranges ...[2]int) int {
+	for range 1000 {
+		port := f.portAllocator.Get()
+		ExpectTrue(port > 0, "alloc port failed")
+
+		inExcludedRange := false
+		for _, portRange := range ranges {
+			if port >= portRange[0] && port <= portRange[1] {
+				inExcludedRange = true
+				break
+			}
+		}
+		if inExcludedRange {
+			f.portAllocator.Release(port)
+			continue
+		}
+
+		f.allocatedPorts = append(f.allocatedPorts, port)
+		return port
+	}
+
+	Failf("alloc port outside excluded ranges failed")
+	return 0
+}
+
 func (f *Framework) ReleasePort(port int) {
 	f.portAllocator.Release(port)
 }