Add pagination, device detail unassign-all, and batch install with slot limit

tests/test_acceptance.py

@@ -807,3 +807,32 @@ def test_full_roundtrip_export_import(client):
                        content_type="multipart/form-data")
     assert resp.status_code == 200
     assert b"Import Results" in resp.data
+
+
+def test_device_detail_unassign_all(seeded_client):
+    client = seeded_client
+    # install battery 1 into device 1 (2-slot AA device)
+    client.post("/device/1/install-one", data={"battery_id": "1"})
+    # unassign all from device detail, redirecting back to device detail
+    resp = client.post(
+        "/device/1/unassign-all",
+        data={"next": "/device/1"},
+        follow_redirects=True,
+    )
+    assert resp.status_code == 200
+    assert b"Unassigned" in resp.data
+    # device detail should now show 0 installed
+    assert b"0 / 2" in resp.data
+
+
+def test_device_install_batch(seeded_client):
+    client = seeded_client
+    # batteries 1 (BrandX AA) and 2 (BrandY AA) are available; device 1 has 2 slots
+    resp = client.post(
+        "/device/1/install-batch",
+        data={"battery_ids": ["1", "2"]},
+        follow_redirects=True,
+    )
+    assert resp.status_code == 200
+    assert b"Installed 2" in resp.data
+    assert b"2 / 2" in resp.data