Fix inventory test

cmd/sup/main_test.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/adammck/venv"
+	"os/exec"
 )
 
 const (
@@ -545,13 +546,20 @@ commands:
 func TestInventory(t *testing.T) {
 	t.Parallel()
 
+	cmd := exec.Command("/bin/sh", "-c", "array=( 0 2 ); for i in \"${array[@]}\"; do printf \"server$i\n# comment\n\n\"; done")
+	stdoutStderr, err := cmd.CombinedOutput()
+	t.Log(string(stdoutStderr))
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	input := `
 ---
 version: 0.4
 
 networks:
   staging:
-    inventory: array=( 0 2 ); for i in "${array[@]}"; do printf "server$i\n\n# comment\n"; done
+    inventory: array=( 0 2 ); for i in "${array[@]}"; do printf "server$i\n# comment\n\n"; done
 
 commands:
   step1: