Updated some documentation.

internal/app/screen_policy_test.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 
 	"git.stormux.org/storm/fenrir/internal/config"
@@ -15,6 +16,51 @@ import (
 	"git.stormux.org/storm/fenrir/internal/screen"
 )
 
+func TestLoginPromptStartupAndDelayedActivation(t *testing.T) {
+	for _, terminal := range []int{1, 2} {
+		// tty1 already has its boot login prompt. tty2's login program
+		// opens the console later, without a keyboard or screen event.
+		prompt := screen.Snapshot{Terminal: terminal, Active: true, Rows: 1, Cols: 7, Cells: []rune("login: ")}
+		source := &fakeSource{snapshot: prompt}
+		if terminal == 2 {
+			source.snapshot = screen.Snapshot{Terminal: terminal}
+		}
+		voice := &fakeVoice{}
+		var modes []bool
+		keys := &fakeKeys{poll: func(active bool, _ func(input.Decision)) error {
+			modes = append(modes, active)
+			return nil
+		}}
+		a, err := new_application(context.Background(), source, keys, voice, RunOptions{Settings: config.Defaults()})
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(a.ui.close)
+		if err := a.read_screen(); err != nil {
+			t.Fatal(err)
+		}
+		if err := a.poll_input(true); err != nil {
+			t.Fatal(err)
+		}
+		if terminal == 2 {
+			if a.lastActive || len(voice.messages) != 0 {
+				t.Fatal("unused console was captured or read", a.lastActive, voice.messages)
+			}
+			source.snapshot = prompt
+			if err := a.poll_input(false); err != nil {
+				t.Fatal(err)
+			}
+		}
+		wantModes := []bool{true}
+		if terminal == 2 {
+			wantModes = []bool{false, true}
+		}
+		if !a.lastActive || !reflect.DeepEqual(modes, wantModes) || !strings.Contains(strings.Join(voice.messages, "|"), "login:") {
+			t.Fatal("login prompt did not resume input and speech", terminal, modes, voice.messages)
+		}
+	}
+}
+
 // Model the console's policy boundary independently of the shared application.
 type policySource struct {
 	fakeSource