diff --git a/tests/Feature/AdminPlatformBatchShowPageFallbackCountsShouldRenderWithoutLastResultTest.php b/tests/Feature/AdminPlatformBatchShowPageFallbackCountsShouldRenderWithoutLastResultTest.php
new file mode 100644
index 0000000..fe10b90
--- /dev/null
+++ b/tests/Feature/AdminPlatformBatchShowPageFallbackCountsShouldRenderWithoutLastResultTest.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformBatchShowPageFallbackCountsShouldRenderWithoutLastResultTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_batch_show_page_should_render_fallback_counts_without_last_result(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'plan_batch_show_fallback_counts_0001',
+            'name' => '批次页 fallback 粗统计测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $runId = 'BAS_FALLBACK_COUNTS_0001';
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BATCH_FALLBACK_A',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now()->subMinutes(10),
+            'paid_at' => now()->subMinutes(9),
+            'activated_at' => now()->subMinutes(8),
+            'meta' => [
+                'batch_activation' => [
+                    'run_id' => $runId,
+                ],
+                'subscription_activation_error' => [
+                    'message' => '模拟失败：同步异常',
+                    'at' => now()->toDateTimeString(),
+                    'admin_id' => 1,
+                ],
+            ],
+        ]);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BATCH_FALLBACK_B',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now()->subMinutes(7),
+            'paid_at' => now()->subMinutes(6),
+            'activated_at' => now()->subMinutes(5),
+            'meta' => [
+                'batch_activation' => [
+                    'run_id' => $runId,
+                ],
+            ],
+        ]);
+
+        $html = $this->get('/admin/platform-batches/show?type=bas&run_id=' . $runId)
+            ->assertOk()
+            ->getContent();
+
+        $this->assertStringContainsString('本批次尚未生成 last_result 汇总', $html);
+        $this->assertStringContainsString('data-role="batch-matched-link"', $html);
+        $this->assertStringContainsString('>2<', $html);
+        $this->assertStringContainsString('data-role="batch-failed-count-link"', $html);
+        $this->assertStringContainsString('>1<', $html);
+        $this->assertStringContainsString('失败占比：', $html);
+        $this->assertStringContainsString('50%', $html);
+    }
+}
diff --git a/tests/Feature/AdminPlatformBatchShowPageShouldRenderErrorWhenParamsMissingTest.php b/tests/Feature/AdminPlatformBatchShowPageShouldRenderErrorWhenParamsMissingTest.php
new file mode 100644
index 0000000..733ec7f
--- /dev/null
+++ b/tests/Feature/AdminPlatformBatchShowPageShouldRenderErrorWhenParamsMissingTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformBatchShowPageShouldRenderErrorWhenParamsMissingTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_batch_show_page_should_render_error_when_type_or_run_id_missing(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $html = $this->get('/admin/platform-batches/show?type=bas')
+            ->assertOk()
+            ->getContent();
+
+        $this->assertStringContainsString('参数不完整：请提供 type（bas/bmpa）与 run_id。', $html);
+        $this->assertStringContainsString('href="/admin/platform-orders"', $html);
+        $this->assertStringNotContainsString('data-action="copy-run-id"', $html);
+        $this->assertStringNotContainsString('data-role="batch-spot-check-link"', $html);
+    }
+}
diff --git a/tests/Feature/AdminPlatformBatchShowPageTopReasonTooLongShouldNotRenderGovernanceLinkTest.php b/tests/Feature/AdminPlatformBatchShowPageTopReasonTooLongShouldNotRenderGovernanceLinkTest.php
new file mode 100644
index 0000000..925c1e2
--- /dev/null
+++ b/tests/Feature/AdminPlatformBatchShowPageTopReasonTooLongShouldNotRenderGovernanceLinkTest.php
@@ -0,0 +1,127 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformBatchShowPageTopReasonTooLongShouldNotRenderGovernanceLinkTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_batch_show_page_should_not_render_top_reason_governance_link_when_reason_too_long(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'plan_batch_show_long_reason_0001',
+            'name' => '批次页长原因护栏测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $longReasonBas = str_repeat('B', 260);
+        $longReasonBmpa = str_repeat('P', 260);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BATCH_SHOW_LONG_REASON_BAS_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now()->subMinutes(10),
+            'paid_at' => now()->subMinutes(9),
+            'activated_at' => now()->subMinutes(8),
+            'meta' => [
+                'batch_activation' => [
+                    'run_id' => 'BAS_LONG_REASON_0001',
+                    'last_result' => [
+                        'run_id' => 'BAS_LONG_REASON_0001',
+                        'success' => 1,
+                        'failed' => 1,
+                        'matched' => 2,
+                        'processed' => 2,
+                        'top_reasons' => [
+                            ['reason' => $longReasonBas, 'count' => 1],
+                        ],
+                        'at' => now()->toDateTimeString(),
+                    ],
+                ],
+            ],
+        ]);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BATCH_SHOW_LONG_REASON_BMPA_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now()->subMinutes(7),
+            'paid_at' => now()->subMinutes(6),
+            'activated_at' => now()->subMinutes(5),
+            'meta' => [
+                'batch_mark_paid_and_activate' => [
+                    'run_id' => 'BMPA_LONG_REASON_0001',
+                    'last_result' => [
+                        'run_id' => 'BMPA_LONG_REASON_0001',
+                        'success' => 1,
+                        'failed' => 1,
+                        'matched' => 2,
+                        'processed' => 2,
+                        'top_reasons' => [
+                            ['reason' => $longReasonBmpa, 'count' => 1],
+                        ],
+                        'at' => now()->toDateTimeString(),
+                    ],
+                ],
+            ],
+        ]);
+
+        $basHtml = $this->get('/admin/platform-batches/show?type=bas&run_id=BAS_LONG_REASON_0001')
+            ->assertOk()
+            ->getContent();
+        $bmpaHtml = $this->get('/admin/platform-batches/show?type=bmpa&run_id=BMPA_LONG_REASON_0001')
+            ->assertOk()
+            ->getContent();
+
+        $this->assertStringNotContainsString('sync_error_keyword=', $basHtml);
+        $this->assertStringContainsString('原因过长，请复制到列表页筛选框', $basHtml);
+        $this->assertStringNotContainsString('data-role="batch-top-reason-link"', $basHtml);
+
+        $this->assertStringNotContainsString('bmpa_error_keyword=', $bmpaHtml);
+        $this->assertStringContainsString('原因过长，请复制到列表页筛选框', $bmpaHtml);
+        $this->assertStringNotContainsString('data-role="batch-top-reason-link"', $bmpaHtml);
+    }
+}
diff --git a/tests/Feature/AdminPlatformBatchShowPageUnsafeBackShouldBeDroppedTest.php b/tests/Feature/AdminPlatformBatchShowPageUnsafeBackShouldBeDroppedTest.php
new file mode 100644
index 0000000..4aadd66
--- /dev/null
+++ b/tests/Feature/AdminPlatformBatchShowPageUnsafeBackShouldBeDroppedTest.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformBatchShowPageUnsafeBackShouldBeDroppedTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_batch_show_page_should_drop_unsafe_back_from_return_and_governance_links(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+        $plan = Plan::query()->create([
+            'code' => 'plan_batch_show_unsafe_back_0001',
+            'name' => '批次页 unsafe back 护栏测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $runId = 'BAS_UNSAFE_BACK_0001';
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'order_no' => 'PO_BATCH_SHOW_UNSAFE_BACK_0001',
+            'order_type' => 'new_purchase',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now()->subMinutes(10),
+            'paid_at' => now()->subMinutes(9),
+            'activated_at' => now()->subMinutes(8),
+            'meta' => [
+                'batch_activation' => [
+                    'run_id' => $runId,
+                    'last_result' => [
+                        'run_id' => $runId,
+                        'success' => 1,
+                        'failed' => 1,
+                        'matched' => 2,
+                        'processed' => 2,
+                        'top_reasons' => [
+                            ['reason' => '模拟失败：订阅同步异常', 'count' => 1],
+                        ],
+                        'at' => now()->toDateTimeString(),
+                    ],
+                ],
+            ],
+        ]);
+
+        $unsafeBack = '/admin/platform-orders?x=1%26back%3D%2Fadmin';
+
+        $html = $this->get('/admin/platform-batches/show?type=bas&run_id=' . $runId . '&back=' . urlencode($unsafeBack))
+            ->assertOk()
+            ->getContent();
+
+        $this->assertStringContainsString('href="/admin/platform-orders"', $html);
+        $this->assertStringNotContainsString('back=' . urlencode($unsafeBack), $html);
+        $this->assertStringContainsString('batch_activation_run_id=' . $runId, $html);
+        $this->assertStringNotContainsString('batch_activation_run_id=' . $runId . '&amp;back=', $html);
+    }
+}