fortify: test help message

This helps catch regressions in "command".

Signed-off-by: Ophestra <cat@gensokyo.uk>

main_test.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"flag"
+	"testing"
+
+	"git.gensokyo.uk/security/fortify/command"
+)
+
+func TestHelp(t *testing.T) {
+	testCases := []struct {
+		name string
+		args []string
+		want string
+	}{
+		{
+			"main", []string{}, `
+Usage:	fortify [-h | --help] [-v] [--json] COMMAND [OPTIONS]
+
+Commands:
+    app         Launch app defined by the specified config file
+    run         Configure and start a permissive default sandbox
+    show        Show the contents of an app configuration
+    ps          List active apps and their state
+    version     Show fortify version
+    license     Show full license text
+    template    Produce a config template
+    help        Show this help message
+
+`,
+		},
+		{
+			"run", []string{"run", "-h"}, `
+Usage:	fortify run [-h | --help] [--dbus-config <value>] [--dbus-system <value>] [--mpris] [--dbus-log] [--id <value>] [-a <int>] [-g <value>] [-d <value>] [-u <value>] [--wayland] [-X] [--dbus] [--pulse] COMMAND [OPTIONS]
+
+Flags:
+  -X	Share X11 socket and allow connection
+  -a int
+    	Fortify application ID
+  -d string
+    	Application home directory (default "os")
+  -dbus
+    	Proxy D-Bus connection
+  -dbus-config string
+    	Path to D-Bus proxy config file, or "builtin" for defaults (default "builtin")
+  -dbus-log
+    	Force logging in the D-Bus proxy
+  -dbus-system string
+    	Path to system D-Bus proxy config file, or "nil" to disable (default "nil")
+  -g value
+    	Groups inherited by the app process
+  -id string
+    	App ID, leave empty to disable security context app_id
+  -mpris
+    	Allow owning MPRIS D-Bus path, has no effect if custom config is available
+  -pulse
+    	Share PulseAudio socket and cookie
+  -u string
+    	Passwd name within sandbox (default "chronos")
+  -wayland
+    	Allow Wayland connections
+
+`,
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			out := new(bytes.Buffer)
+			c := buildCommand(out)
+			if err := c.Parse(tc.args); !errors.Is(err, command.ErrHelp) && !errors.Is(err, flag.ErrHelp) {
+				t.Errorf("Parse: error = %v; want %v",
+					err, command.ErrHelp)
+			}
+			if got := out.String(); got != tc.want {
+				t.Errorf("Parse: %s want %s", got, tc.want)
+			}
+		})
+	}
+}