test(ioscompanion): gated companion smoke test

internal/driver/ioscompanion/smoke_test.go

@@ -0,0 +1,85 @@
+//go:build withcompanion
+
+package ioscompanion
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+	"time"
+)
+
+// TestSmokeNewHierarchyScreenshot brings up the embedded companion against the
+// booted simulator, reads one hierarchy and screenshot, closes, and asserts the
+// companion child left no orphan behind. It is gated behind both the
+// withcompanion build tag (so the binary is embedded) and an environment
+// variable, so it never runs in the default suite.
+func TestSmokeNewHierarchyScreenshot(t *testing.T) {
+	if os.Getenv("SANDERLING_IOS_INTEGRATION") == "" {
+		t.Skip("set SANDERLING_IOS_INTEGRATION=1 to run the companion smoke test")
+	}
+	udid := bootedUDID(t)
+
+	before := companionProcessCount(t, udid)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Second)
+	defer cancel()
+	d, err := New(ctx, Options{UniqueDeviceIdentifier: udid, Output: os.Stderr})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+
+	if _, err := d.Hierarchy(ctx); err != nil {
+		d.Close()
+		t.Fatalf("Hierarchy: %v", err)
+	}
+	if _, err := d.Screenshot(ctx); err != nil {
+		d.Close()
+		t.Fatalf("Screenshot: %v", err)
+	}
+	d.Close()
+
+	// Give the child a moment to exit after SIGTERM, then confirm no orphan.
+	deadline := time.Now().Add(10 * time.Second)
+	for time.Now().Before(deadline) {
+		if companionProcessCount(t, udid) <= before {
+			return
+		}
+		time.Sleep(200 * time.Millisecond)
+	}
+	t.Fatalf("companion process for %s outlived Close (orphan)", udid)
+}
+
+func bootedUDID(t *testing.T) string {
+	t.Helper()
+	output, err := exec.Command("xcrun", "simctl", "list", "devices", "booted").Output()
+	if err != nil {
+		t.Fatalf("simctl list: %v", err)
+	}
+	for _, line := range strings.Split(string(output), "\n") {
+		if start := strings.Index(line, "("); start >= 0 {
+			if end := strings.Index(line[start:], ")"); end > 0 {
+				candidate := line[start+1 : start+end]
+				if len(candidate) == 36 {
+					return candidate
+				}
+			}
+		}
+	}
+	t.Skip("no booted simulator available")
+	return ""
+}
+
+func companionProcessCount(t *testing.T, udid string) int {
+	t.Helper()
+	output, _ := exec.Command("pgrep", "-f", udid).Output()
+	count := 0
+	for _, line := range strings.Split(strings.TrimSpace(string(output)), "\n") {
+		if strings.TrimSpace(line) != "" {
+			count++
+		}
+	}
+	return count
+}