diff --git a/tests/unit/test_documentation_consistency.py b/tests/unit/test_documentation_consistency.py
index ea32fbd..7fefcaa 100644
--- a/tests/unit/test_documentation_consistency.py
+++ b/tests/unit/test_documentation_consistency.py
@@ -120,6 +120,7 @@ TRAINING_M41_RELEASE_INDEX_GUARD_TEST_INVENTORY = (
     "test_training_m56_release_index_required_snippet_inventory_source_shape_rejects_dynamic_fixtures",
     "test_training_m57_release_index_required_snippet_inventory_source_shape_diagnostics_are_locked",
     "test_training_m58_release_index_required_snippet_inventory_source_shape_accepts_literal_fixtures",
+    "test_training_m59_release_index_required_snippet_inventory_source_shape_preserves_literal_order",
     "test_training_m53_release_index_doc_category_coverage_is_exact",
     "test_training_case_product_doc_reflects_current_m40_maturity",
 )
@@ -570,6 +571,9 @@ class DocumentationConsistencyTests(unittest.TestCase):
             "required_snippet_inventory_source_shape_positive_fixtures": (
                 "test_training_m58_release_index_required_snippet_inventory_source_shape_accepts_literal_fixtures"
             ),
+            "required_snippet_inventory_source_shape_literal_order": (
+                "test_training_m59_release_index_required_snippet_inventory_source_shape_preserves_literal_order"
+            ),
             "per_doc_helper_exact_category_coverage": (
                 "test_training_m53_release_index_doc_category_coverage_is_exact"
             ),
@@ -724,6 +728,7 @@ class DocumentationConsistencyTests(unittest.TestCase):
             "test_training_m56_release_index_required_snippet_inventory_source_shape_rejects_dynamic_fixtures",
             "test_training_m57_release_index_required_snippet_inventory_source_shape_diagnostics_are_locked",
             "test_training_m58_release_index_required_snippet_inventory_source_shape_accepts_literal_fixtures",
+            "test_training_m59_release_index_required_snippet_inventory_source_shape_preserves_literal_order",
             "test_training_m53_release_index_doc_category_coverage_is_exact",
             "test_training_case_product_doc_reflects_current_m40_maturity",
         )
@@ -1096,6 +1101,44 @@ TRAINING_M41_RELEASE_INDEX_REQUIRED_SNIPPET_INVENTORY = (
         self.assertEqual(source_group_order, expected_categories)
         self.assertNotEqual(source_group_order, tuple(sorted(source_group_order)))
 
+    def test_training_m59_release_index_required_snippet_inventory_source_shape_preserves_literal_order(
+        self,
+    ) -> None:
+        source = """
+TRAINING_M41_RELEASE_INDEX_REQUIRED_SNIPPET_INVENTORY = (
+    (
+        "literal_order_third_category",
+        (
+            "third literal order signal",
+        ),
+    ),
+    (
+        "literal_order_first_category",
+        (
+            "first literal order signal",
+        ),
+    ),
+    (
+        "literal_order_second_category",
+        (
+            "second literal order signal",
+        ),
+    ),
+)
+"""
+        expected_categories = (
+            "literal_order_third_category",
+            "literal_order_first_category",
+            "literal_order_second_category",
+        )
+
+        source_group_order = (
+            self._release_index_required_snippet_inventory_source_categories(source)
+        )
+
+        self.assertNotEqual(expected_categories, tuple(sorted(expected_categories)))
+        self.assertEqual(source_group_order, expected_categories)
+
     def test_training_m53_release_index_doc_category_coverage_is_exact(self) -> None:
         inventory = TRAINING_M41_RELEASE_INDEX_REQUIRED_SNIPPET_INVENTORY
         inventory_by_category = dict(inventory)