add new cmd/test to old runtime to test SC

script/runtime/cmd_hello.go

@@ -0,0 +1,12 @@
+package runtime
+
+func (ts *Script) CmdHello(neg int, args []string) {
+	if neg != 0 {
+		ts.Fatalf("unsupported: !? stdin")
+	}
+	out := "hello world"
+	if len(args) >= 1 {
+		out = "hello " + args[0]
+	}
+	ts.stdout = out
+}

script/runtime/cmds.go

@@ -52,5 +52,6 @@ var scriptCmds = map[string]func(*Script, int, []string){
 
 	// other
 	"unquote": (*Script).CmdUnquote,
+	"hello": (*Script).CmdHello,
 }
 

script/runtime/tests/hello.txt

@@ -5,5 +5,14 @@ exec cat hello.text
 stdout 'hello world\n'
 ! stderr .
 
+hello
+stdout 'hello world'
+! stderr .
+
+hello apple
+stdout 'hello apple'
+! stderr .
+
+
 -- hello.text --
 hello world