diff --git a/api-v3/test/unit/f6-4-android-modern-field.test.ts b/api-v3/test/unit/f6-4-android-modern-field.test.ts
new file mode 100644
index 0000000..38e48cc
--- /dev/null
+++ b/api-v3/test/unit/f6-4-android-modern-field.test.ts
@@ -0,0 +1,43 @@
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import test from 'node:test';
+
+function apiFile(path: string): string {
+  return readFileSync(resolve(process.cwd(), path), 'utf8');
+}
+
+function repoFile(path: string): string {
+  return readFileSync(resolve(process.cwd(), '..', path), 'utf8');
+}
+
+test('F6.4 Android Installation picker searches live and selects a concrete parent', () => {
+  const screen = repoFile('android-app/app/src/main/java/com/korexlabs/dhinspeccion/ui/ModernVisitRoot.kt');
+
+  assert.match(screen, /LaunchedEffect\(modeName, parentSearch\)/);
+  assert.match(screen, /delay\(280\)/);
+  assert.match(screen, /model\.searchInventory\(parentSearch\.trim\(\), visit\.scopeAsset\?\.id\)/);
+  assert.match(screen, /ElevatedCard\(onClick = \{ chooseParent\(item\) \}/);
+  assert.match(screen, /model\.loadFieldTypes\(item\.id\)/);
+});
+
+test('F6.4 Android field shell uses the modern theme and workspace', () => {
+  const gate = repoFile('android-app/app/src/main/java/com/korexlabs/dhinspeccion/ui/LoginGate.kt');
+  const theme = repoFile('android-app/app/src/main/java/com/korexlabs/dhinspeccion/ui/DhTheme.kt');
+
+  assert.match(gate, /DhTheme \{/);
+  assert.match(gate, /model\.visit != null -> ModernVisitRoot\(model\)/);
+  assert.match(theme, /RoundedCornerShape\(16\.dp\)/);
+});
+
+test('F6.4 Android Act list uses a mobile read model independent from office reports', () => {
+  const android = repoFile('android-app/app/src/main/java/com/korexlabs/dhinspeccion/data/MobileActs.kt');
+  const controller = apiFile('src/inspection-acts/mobile-inspection-acts.controller.ts');
+  const service = apiFile('src/inspection-acts/mobile-inspection-acts.service.ts');
+
+  assert.match(android, /inspection-visits\/\{visitId\}\/acts\/mobile/);
+  assert.match(controller, /inspection-visits\/:visitId\/acts\/mobile/);
+  assert.match(service, /FROM inspection_acts act/);
+  assert.doesNotMatch(service, /inspection_reports/);
+  assert.doesNotMatch(service, /inspection_document/);
+});