test: add stdout stderr stream checks

Signed-off-by: Alessio Greggi <[email protected]>

tests/integration.txtar

@@ -42,9 +42,19 @@ exec chmod +x bin/example-app
 exec ls -la bin/example-app
 exec bin/example-app coin
 
+exec harpoon capture -f main.main -- ./bin/example-app coin
+stdout 'write'
+
 exec harpoon capture -f main.main -c -- ./bin/example-app coin
 stdout 'stdout: \[flip coin\]'
 
+exec harpoon capture -f main.main -e -- ./bin/example-app streams
+stdout 'stderr: 0'
+
+exec harpoon capture -f main.main -c -e -- ./bin/example-app streams
+stdout 'stdout: 0'
+stdout 'stderr: 0'
+
 exec harpoon capture -f main.main -- ./bin/example-app coin
 stdout 'write'
 

tests/testcases/example-app/cmd/streams.go

@@ -0,0 +1,39 @@
+/*
+Copyright © 2023 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+
+	"github.com/alegrey91/seccomp-test-coverage/pkg/streams"
+)
+
+// streamsCmd represents the streams command
+var streamsCmd = &cobra.Command{
+	Use:   "streams",
+	Short: "A brief description of your command",
+	Long: `A longer description that spans multiple lines and likely contains examples
+and usage of using your command. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		streams.PrintOutErr()
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(streamsCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// streamsCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// streamsCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}

tests/testcases/example-app/pkg/streams/streams.go

@@ -0,0 +1,13 @@
+package streams
+
+import (
+	"fmt"
+	"os"
+)
+
+func PrintOutErr() {
+	for i := 0; i < 10; i++ {
+		fmt.Fprintf(os.Stderr, "%v\n", i)
+		fmt.Fprintf(os.Stdout, "%v\n", i)
+	}
+}