diff --git a/tests/install_upgrade_operators/hco_enablement_golden_image_updates/multiarch/__init__.py b/tests/install_upgrade_operators/hco_enablement_golden_image_updates/multiarch/__init__.py
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diff --git a/tests/install_upgrade_operators/hco_enablement_golden_image_updates/multiarch/test_multiarch_golden_images_support.py b/tests/install_upgrade_operators/hco_enablement_golden_image_updates/multiarch/test_multiarch_golden_images_support.py
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+++ b/tests/install_upgrade_operators/hco_enablement_golden_image_updates/multiarch/test_multiarch_golden_images_support.py
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+"""
+Multi-Architecture Golden Image Tests
+
+STP Reference:
+https://github.com/RedHatQE/openshift-virtualization-tests-design-docs/blob/main/stps/sig-iuo/multiarch_arm_support.md
+
+Preconditions:
+    - Multi-architecture cluster with AMD64 and ARM64 worker nodes
+    - "enableMultiArchBootImageImport" feature gate enabled in HCO CR
+    - Prometheus is installed and running
+
+Markers:
+    - multiarch
+    - post_upgrade
+"""
+
+import pytest
+
+__test__ = False
+
+
+class TestDisabledMultiarchGoldenImagesSupport:
+    """
+    Tests for boot source state and misconfiguration metrics when
+    multi-architecture golden images support is disabled on a
+    heterogeneous cluster.
+
+    Preconditions:
+        - "enableMultiArchBootImageImport" feature gate disabled in HCO CR
+    """
+
+    @pytest.mark.polarion("CNV-15977")
+    def test_only_architecture_agnostic_golden_image_resources_exist(self):
+        """
+        Test that only architecture-agnostic golden image resources exist
+        after disabling multi-architecture golden images support.
+
+        Parametrize:
+            - resource_type:
+                - DataImportCron
+                - DataSource
+
+        Steps:
+            1. List resources of the parametrized type in the golden images namespace.
+            2. Verify arch-suffix resources are not present.
+
+        Expected:
+            - No resources exist with architecture suffix.
+        """
+
+    @pytest.mark.polarion("CNV-15978")
+    def test_architecture_agnostic_data_sources_rollback(self):
+        """
+        Test that architecture-agnostic (pointer) DataSources remain available after
+        disabling multi-architecture golden images support, and pointing to a pvc/snapshot source.
+
+        Steps:
+            1. Get architecture-agnostic DataSources from golden images namespace.
+            2. Wait for them to be in ready condition.
+
+        Expected:
+            - Architecture-agnostic DataSources reference a pvc/snapshot source.
+        """
+
+    @pytest.mark.polarion("CNV-15979")
+    def test_kubevirt_hco_multi_arch_boot_images_enabled_metric(self):
+        """
+        Test that the metric is indicating that multi-arch
+        golden images support is disabled on a multiarch cluster.
+
+        Steps:
+            1. Query the metric.
+
+        Expected:
+            - Metric value is 0.
+        """
+
+    @pytest.mark.polarion("CNV-15980")
+    def test_kubevirt_hco_multi_arch_boot_images_enabled_metric_cleared(self):
+        """
+        Test that the metric is indicating that multi-arch support is enabled
+        when nodePlacement restricts workloads to a single architecture.
+
+        Preconditions:
+            - nodePlacement restricts workloads to a single architecture in HCO CR.
+
+        Steps:
+            1. Query the metric.
+
+        Expected:
+            - Metric value is 1.
+        """
+
+
+class TestEnabledMultiarchGoldenImagesSupport:
+    """
+    Tests for architecture-specific golden image boot sources availability
+    and correctness on a heterogeneous cluster.
+
+    Preconditions:
+        - "enableMultiArchBootImageImport" feature gate enabled in HCO CR
+    """
+
+    @pytest.mark.polarion("CNV-15981")
+    def test_architecture_specific_golden_image_resources(self):
+        """
+        Test that architecture-specific golden image resources are created
+        for each common DataImportCronTemplate and each supported cluster architecture.
+
+        Parametrize:
+            - resource_type, expected_condition:
+                - DataImportCron, UpToDate
+                - DataSource, Ready
+
+        Steps:
+            1. Get supported architectures from cluster worker nodes.
+            2. List parametrized resources in the golden images namespace.
+
+        Expected:
+            - Architecture-specific golden image resources exist for each supported
+              architecture matching the workers architectures and in expected condition.
+        """
+
+    @pytest.mark.polarion("CNV-15982")
+    def test_architecture_agnostic_data_sources(self):
+        """
+        Test that architecture-agnostic (pointer) DataSources are referencing
+        the default architecture-specific DataSource.
+
+        Steps:
+            1. Get architecture-agnostic DataSources from golden images namespace.
+            2. Get control-plane architecture.
+
+        Expected:
+            - DataSources in ready condition and referencing the control-plane
+              architecture-specific DataSource.
+        """
+
+
+class TestMultiarchGoldenImageAnnotationMetrics:
+    """
+    Tests for misconfiguration metrics on golden image annotation issues
+    when "enableMultiArchBootImageImport" feature gate is enabled in HCO CR.
+
+    Preconditions:
+        - "enableMultiArchBootImageImport" feature gate enabled in HCO CR
+    """
+
+    @pytest.mark.polarion("CNV-15983")
+    def test_kubevirt_hco_dataimportcrontemplate_with_supported_architectures_metric(self):
+        """
+        Test that a misconfiguration metric is reported when a golden
+        image is annotated with an architecture not supported by the cluster.
+
+        Preconditions:
+            - HCO CR is patched with a custom DataImportCronTemplate annotated
+              with architecture not supported by the cluster.
+
+        Steps:
+            1. Query the metric.
+
+        Expected:
+            - Metric value is 0.
+        """
+
+    @pytest.mark.polarion("CNV-15984")
+    def test_kubevirt_hco_dataimportcrontemplate_with_architecture_annotation_metric(self):
+        """
+        Test that a misconfiguration metric is reported when a golden
+        image lacks an architecture annotation on a multi-architecture cluster.
+
+        Preconditions:
+            - HCO CR is patched with a custom DataImportCronTemplate annotated without
+              architecture annotation.
+
+        Steps:
+            1. Query the metric.
+
+        Expected:
+            - Metric value is 0.
+        """