[test] add expect tests for child (#5037)

This adds test cases for child command. Also moves ping tests with 2
nodes to cli-2-nodes.exp, future tests requiring 2 nodes will be
placed in this file.

tests/scripts/expect/cli-ping.exp

@@ -33,88 +33,14 @@ expect_after {
     timeout { exit 1 }
 }
 send "ping ::1 1 2 1 1\n"
-expect "Done\r\n"
+expect "Done"
 send "ping stop\n"
-expect "Done\r\n"
+expect "Done"
+send "ping ::1 1 2 0.12345 1\n"
+expect "Done"
+send "ping stop\n"
+expect "Done"
 send "ping ::1 1 2 1 1 1\n"
-expect "Error 7: InvalidArgs\r\n"
-send "\x04"
-expect eof
-
-
-proc wait_for {command expected} {
-    set result 0
-    for {set i 0} {$i < 20} {incr i} {
-        send "$command\n"
-        expect {
-            -re $expected {
-                set result 1
-            }
-            timeout {
-                # Do nothing
-            }
-        }
-        if {$result == 1} {
-            break
-        }
-    }
-    if {$result == 0} {
-        exit 1
-    }
-}
-
-spawn $env(OT_COMMAND) 1
-set spawn_1 $spawn_id
-expect_after {
-    timeout { exit 1 }
-}
-spawn $env(OT_COMMAND) 2
-set spawn_2 $spawn_id
-expect_after {
-    timeout { exit 1 }
-}
-set psk "J01NME"
-
-set spawn_id $spawn_2
-send "eui64\n"
-expect -re "(\[0-9a-f\]{16})"
-set eui64 $expect_out(1,string)
-
-set spawn_id $spawn_1
-send "dataset init new\n"
-expect "Done"
-send "dataset commit active\n"
-expect "Done"
-send "ifconfig up\n"
-expect "Done"
-send "thread start\n"
-expect "Done"
-wait_for "state" "leader"
-send "commissioner start\n"
-expect "Done"
-expect "Commissioner: active"
-send "commissioner joiner add $eui64 $psk\n"
-expect "Done"
-
-set spawn_id $spawn_2
-send "ifconfig up\n"
-expect "Done"
-send "joiner start $psk\n"
-expect "Done"
-wait_for "" "Join success"
-send "thread start\n"
-expect "Done"
-wait_for "state" "child|router"
-send "ipaddr\n"
-expect -re "((\[0-9a-fA-F\]{1,4}:){7,7}\[0-9a-fA-F\]{1,4})"
-set addr $expect_out(1,string)
-
-set spawn_id $spawn_1
-send "ping $addr\n"
-expect "16 bytes from $addr:"
-send "\x04"
-expect eof
-
-set spawn_id $spawn_2
+expect "Error 7: InvalidArgs"
 send "\x04"
 expect eof