Add APIv4 /system/ping endpoint (#5443)

api4/system_test.go

@@ -0,0 +1,18 @@
+package api4
+
+import (
+	"testing"
+)
+
+func TestGetPing(t *testing.T) {
+	th := Setup().InitBasic()
+	defer TearDown()
+	Client := th.Client
+
+	b, _ := Client.GetPing()
+	if b == false  {
+		t.Fatal()
+	}
+}
+
+