fn test main commands (#481)

fn/main.go

@@ -30,7 +30,7 @@ func aliasesFn() []cli.Command {
 	return cmds
 }
 
-func main() {
+func newFn() *cli.App {
 	app := cli.NewApp()
 	app.Name = "fn"
 	app.Version = fnversion
@@ -77,6 +77,11 @@ GLOBAL OPTIONS:
 		version(),
 	}
 	app.Commands = append(app.Commands, aliasesFn()...)
+	return app
+}
+
+func main() {
+	app := newFn()
 	app.Run(os.Args)
 }
 

fn/main_test.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"path"
+	"strings"
+	"testing"
+)
+
+func TestMainCommands(t *testing.T) {
+	testCommands := []string{
+		"init",
+		"apps",
+		"routes",
+		"images",
+		"lambda",
+		"version",
+		"build",
+		"bump",
+		"deploy",
+		"run",
+		"push",
+	}
+
+	fnTestBin := path.Join(os.TempDir(), "fn-test")
+
+	exec.Command("go", "build", "-o", fnTestBin).Run()
+
+	for _, cmd := range testCommands {
+		res, err := exec.Command(fnTestBin, strings.Split(cmd, " ")...).CombinedOutput()
+		if bytes.Contains(res, []byte("command not found")) {
+			t.Error(err)
+		}
+	}
+
+	os.Remove(fnTestBin)
+}