diff --git a/tests/unit/plugins/inventory/test_kubevirt.py b/tests/unit/plugins/inventory/test_kubevirt.py
index 056231c..fe0f253 100644
--- a/tests/unit/plugins/inventory/test_kubevirt.py
+++ b/tests/unit/plugins/inventory/test_kubevirt.py
@@ -6,7 +6,7 @@ from __future__ import absolute_import, division, print_function
 
 __metaclass__ = type
 
-import copy
+from json import dumps
 
 import pytest
 
@@ -14,6 +14,7 @@ from addict import Dict
 
 
 from ansible_collections.kubevirt.core.plugins.inventory.kubevirt import (
+    DynamicApiError,
     GetVmiOptions,
     InventoryModule,
     KubeVirtInventoryException,
@@ -772,7 +773,7 @@ def children_group_with_vmi_create_groups_option(children_group_with_vmi):
 
 @pytest.fixture(scope="function")
 def inventory_groups_create_groups_option(inventory_groups):
-    inv = copy.deepcopy(inventory_groups)
+    inv = deepcopy(inventory_groups)
     inv.append("label_kubevirt_io_domain_test_domain")
     return inv
 
@@ -1016,7 +1017,7 @@ def loadbalancer():
 
 @pytest.fixture(scope="module")
 def nodeport(loadbalancer):
-    np = copy.deepcopy(loadbalancer)
+    np = deepcopy(loadbalancer)
     np["test-domain"]["spec"]["type"] = "NodePort"
     return np
 
@@ -1137,3 +1138,49 @@ def test_set_ansible_host_and_port(monkeypatch, request, inventory, host_vars, v
     inventory.set_ansible_host_and_port(Dict(vmi), vmi_name, "10.10.10.10", service, opts)
 
     assert request.getfixturevalue(result) == host_vars
+
+
+@pytest.fixture(scope="function")
+def body_error(mocker):
+    error = DynamicApiError(e=mocker.Mock())
+    error.headers = None
+
+    body = "This is a test error"
+    error.body = body
+
+    return error
+
+
+@pytest.fixture(scope="function")
+def message_error(mocker):
+    error = DynamicApiError(e=mocker.Mock())
+    error.headers = {
+        "Content-Type": "application/json"
+    }
+
+    error.body = dumps({"message": "This is a test error"}).encode('utf-8')
+
+    return error
+
+
+@pytest.fixture(scope="function")
+def status_reason_error(mocker):
+    error = DynamicApiError(e=mocker.Mock())
+    error.body = None
+    error.status = 404
+    error.reason = "This is a test error"
+    return error
+
+
+@pytest.mark.parametrize(
+    "error_object,expected_error_msg",
+    [
+        ("body_error", "This is a test error"),
+        ("message_error", "This is a test error"),
+        ("status_reason_error", "404 Reason: This is a test error"),
+    ],
+)
+def test_format_dynamic_api_exc(request, inventory, error_object, expected_error_msg):
+
+    result = inventory.format_dynamic_api_exc(request.getfixturevalue(error_object))
+    assert expected_error_msg == result
diff --git a/tests/unit/plugins/inventory/test_kubevirt_composable_vars.py b/tests/unit/plugins/inventory/test_kubevirt_composable_vars.py
new file mode 100644
index 0000000..c087226
--- /dev/null
+++ b/tests/unit/plugins/inventory/test_kubevirt_composable_vars.py
@@ -0,0 +1,119 @@
+# -*- coding: utf-8 -*-
+# Copyright 2024 Red Hat, Inc.
+# Apache License 2.0 (see LICENSE or http://www.apache.org/licenses/LICENSE-2.0)
+
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
+import pytest
+
+from ansible_collections.kubevirt.core.plugins.inventory.kubevirt import (
+    InventoryModule,
+)
+
+from ansible.template import Templar
+
+
+@pytest.fixture(scope="function")
+def inventory_composable_vars(mocker):
+    inventory = InventoryModule()
+
+    inventory.templar = Templar(loader=None)
+
+    inventory._options = {
+        "compose": {"block_migratable_vmis": "vmi_migration_method"},
+        "strict": True,
+        "groups": {"vmi_node_groups": "cluster_name"},
+        "keyed_groups": [{"prefix": "fedora", "key": "vmi_guest_os_info.version"}],
+    }
+
+    inventory.inventory = mocker.Mock()
+
+    return inventory
+
+
+@pytest.fixture(scope="function")
+def host_vars(monkeypatch, inventory_composable_vars):
+    host_vars = {}
+
+    def set_variable(host, key, value):
+        if host not in host_vars:
+            host_vars[host] = {}
+        host_vars[host][key] = value
+
+    monkeypatch.setattr(
+        inventory_composable_vars.inventory, "set_variable", set_variable
+    )
+    return host_vars
+
+
+@pytest.fixture(scope="function")
+def add_group(monkeypatch, inventory_composable_vars):
+    groups = []
+
+    def add_group(name):
+        if name not in groups:
+            groups.append(name)
+        return name
+
+    monkeypatch.setattr(inventory_composable_vars.inventory, "add_group", add_group)
+    return groups
+
+
+@pytest.fixture(scope="function")
+def add_host(monkeypatch, inventory_composable_vars):
+    hosts = []
+
+    def add_host(name, group=None):
+        if name not in hosts:
+            hosts.append(name)
+        if group is not None and group not in hosts:
+            hosts.append(group)
+
+    monkeypatch.setattr(inventory_composable_vars.inventory, "add_host", add_host)
+    return hosts
+
+
+@pytest.fixture(scope="function")
+def add_child(monkeypatch, inventory_composable_vars):
+    children = {}
+
+    def add_child(group, name):
+        if group not in children:
+            children[group] = []
+        if name not in children[group]:
+            children[group].append(name)
+
+    monkeypatch.setattr(inventory_composable_vars.inventory, "add_child", add_child)
+    return children
+
+
+@pytest.fixture(scope="module")
+def vmi_host_vars():
+    return {
+        "vmi_migration_method": "BlockMigration",
+        "vmi_guest_os_info": {"id": "fedora", "version": "39"},
+        "cluster_name": {"test-cluster"},
+    }
+
+
+def test_set_composable_vars(
+    inventory_composable_vars,
+    mocker,
+    host_vars,
+    add_group,
+    add_child,
+    add_host,
+    vmi_host_vars,
+):
+    get_vars = mocker.patch.object(
+        inventory_composable_vars.inventory.get_host(), "get_vars"
+    )
+    get_vars.return_value = vmi_host_vars
+    inventory_composable_vars.set_composable_vars("testvmi")
+
+    assert {"testvmi": {"block_migratable_vmis": "BlockMigration"}} == host_vars
+    assert ["vmi_node_groups", "fedora_39"] == add_group
+    assert {"vmi_node_groups": ["testvmi"]} == add_child
+    assert ["testvmi", "fedora_39"] == add_host