diff --git a/test/test_build.py b/test/test_build.py
index 7c8ffd13..2ec265f1 100644
--- a/test/test_build.py
+++ b/test/test_build.py
@@ -694,6 +694,9 @@ def assert_disk_customizations(image_type, test_vm):
                                       keyfile=image_type.ssh_keyfile_private_path)
     assert exit_status == 0
     findmnt = json.loads(output)
+    exit_status, swapon_output = test_vm.run("swapon --show", user="root",
+                                             keyfile=image_type.ssh_keyfile_private_path)
+    assert exit_status == 0
     if dc := image_type.disk_config:
         if dc == "lvm":
             mnts = [mnt for mnt in findmnt["filesystems"][0]["children"]
@@ -707,3 +710,7 @@ def assert_disk_customizations(image_type, test_vm):
             assert "btrfs" == mnts[0]["fstype"]
             # ensure sysroot comes from the "root" subvolume
             assert mnts[0]["source"].endswith("[/root]")
+        elif dc == "swap":
+            # XXX: drop once this actually runs
+            print(swapon_output)
+            assert "1234" in swapon_output
diff --git a/test/test_manifest.py b/test/test_manifest.py
index c869bdb4..367133e1 100644
--- a/test/test_manifest.py
+++ b/test/test_manifest.py
@@ -633,3 +633,34 @@ def test_manifest_disk_customization_btrfs(tmp_path, build_container):
     st = find_bootc_install_to_fs_stage_from(output)
     assert st["mounts"][0]["type"] == "org.osbuild.btrfs"
     assert st["mounts"][0]["target"] == "/"
+
+
+def test_manifest_disk_customization_swap(tmp_path, build_container):
+    container_ref = "quay.io/centos-bootc/centos-bootc:stream9"
+
+    config = {
+        "customizations": {
+            "disk": {
+                "partitions": [
+                    {
+                        "minsize": "2 GiB",
+                        "fs_type": "swap",
+                    }
+                ]
+            }
+        }
+    }
+    config_path = tmp_path / "config.json"
+    with config_path.open("w") as config_file:
+        json.dump(config, config_file)
+
+    output = subprocess.check_output([
+        *testutil.podman_run_common,
+        "-v", f"{config_path}:/config.json:ro",
+        build_container,
+        "manifest", f"{container_ref}",
+    ])
+    fstab_stage = find_fstab_stage_from(output)
+    filesystems = fstab_stage["options"]["filesystems"]
+    # XXX: find swap
+    print(filesystems)
diff --git a/test/testcases.py b/test/testcases.py
index ed0ee45e..ea10622f 100644
--- a/test/testcases.py
+++ b/test/testcases.py
@@ -84,17 +84,14 @@ def gen_testcases(what):  # pylint: disable=too-many-return-statements
             TestCaseCentos(image="anaconda-iso"),
         ]
     if what == "qemu-boot":
-        # test partition defaults with qcow2
         test_cases = [
-            klass(image="qcow2")
-            for klass in (TestCaseCentos, TestCaseFedora)
+            # test default partitioning
+            TestCaseFedora(image="qcow2"),
+            # test with custom disk configs
+            TestCaseCentos(image="qcow2", disk_config="swap"),
+            TestCaseFedora(image="raw", disk_config="btrfs"),
+            TestCaseCentos(image="raw", disk_config="lvm"),
         ]
-        # and custom with raw (this is arbitrary, we could do it the
-        # other way around too
-        test_cases.append(
-            TestCaseCentos(image="raw", disk_config="lvm"))
-        test_cases.append(
-            TestCaseFedora(image="raw", disk_config="btrfs"))
         # do a cross arch test too
         if platform.machine() == "x86_64":
             # TODO: re-enable once
diff --git a/test/testutil.py b/test/testutil.py
index 8ee8682d..46a922cb 100644
--- a/test/testutil.py
+++ b/test/testutil.py
@@ -159,6 +159,10 @@ def maybe_create_disk_customizations(cfg, tc):
                             "minsize": "10 GiB",
                             "fs_type": "xfs",
                             "mountpoint": "/",
+                        },
+                        {
+                            "minsize": "2 GiB",
+                            "fs_type": "swap",
                         }
                     ]
                 }
@@ -179,6 +183,15 @@ def maybe_create_disk_customizations(cfg, tc):
                 }
             ]
         }
+    elif tc.disk_config == "swap":
+        cfg["customizations"]["disk"] = {
+            "partitions": [
+                {
+                    "minsize": "1234567890",
+                    "fs_type": "swap",
+                }
+            ]
+        }
     else:
         raise ValueError(f"unsupported disk_config {tc.disk_config}")