feat: harden runtime import and frontend verification workflows

internal/app/batch_utils_test.go

@@ -0,0 +1,57 @@
+package app
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+// Test utility functions from batch_runtime.go
+
+func TestSleepWithContext_Normal(t *testing.T) {
+	ctx := context.Background()
+	start := time.Now()
+	err := sleepWithContext(ctx, 1*time.Millisecond)
+	elapsed := time.Since(start)
+
+	if err != nil {
+		t.Errorf("sleep should not error: %v", err)
+	}
+	if elapsed < 1*time.Millisecond {
+		t.Error("should have slept")
+	}
+}
+
+func TestSleepWithContext_Canceled(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	start := time.Now()
+	err := sleepWithContext(ctx, 100*time.Millisecond)
+	elapsed := time.Since(start)
+
+	if err == nil {
+		t.Error("canceled context should return error")
+	}
+	if elapsed > 10*time.Millisecond {
+		t.Error("should have returned early due to cancellation")
+	}
+}
+
+func TestFirstNonEmptyString(t *testing.T) {
+	if firstNonEmptyString("", "", "value") != "value" {
+		t.Error("should return first non-empty")
+	}
+}
+
+func TestFirstNonEmptyString_First(t *testing.T) {
+	if firstNonEmptyString("first", "second", "third") != "first" {
+		t.Error("should return first value when all non-empty")
+	}
+}
+
+func TestFirstNonEmptyString_AllEmpty(t *testing.T) {
+	if firstNonEmptyString("", "", "") != "" {
+		t.Error("all empty should return empty")
+	}
+}