Add tests for knowledge propagation

tests/test_column_level_knowledge_propagator.py

@@ -0,0 +1,119 @@
+import json
+from dbt.contracts.graph.manifest import Manifest
+from dbt_osmosis.core.column_level_knowledge_propagator import (
+    _build_node_ancestor_tree,
+    _inherit_column_level_knowledge,
+)
+
+
+def test_build_node_ancestor_tree():
+    manifest_path = "tests/data/manifest.json"
+    with open(manifest_path, "r") as f:
+        manifest_text = f.read()
+        manifest_dict = json.loads(manifest_text)
+    manifest = Manifest.from_dict(manifest_dict)
+
+    target_node = manifest.nodes["model.jaffle_shop_duckdb.customers"]
+    expect = {
+        "generation_0": [
+            "model.jaffle_shop_duckdb.stg_customers",
+            "model.jaffle_shop_duckdb.stg_orders",
+            "model.jaffle_shop_duckdb.stg_payments",
+        ],
+        "generation_1": [
+            "seed.jaffle_shop_duckdb.raw_customers",
+            "seed.jaffle_shop_duckdb.raw_orders",
+            "seed.jaffle_shop_duckdb.raw_payments",
+        ],
+    }
+    assert _build_node_ancestor_tree(manifest, target_node) == expect
+
+
+def test_inherit_column_level_knowledge():
+    manifest_path = "tests/data/manifest.json"
+    with open(manifest_path, "r") as f:
+        manifest_text = f.read()
+        manifest_dict = json.loads(manifest_text)
+
+    manifest_dict["nodes"]["model.jaffle_shop_duckdb.stg_customers"]["columns"]["customer_id"]["description"] = "THIS COLUMN IS UPDATED FOR TESTING"
+    manifest = Manifest.from_dict(manifest_dict)
+
+    expect = {
+        "customer_id": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_customers",
+            "generation": "generation_0",
+            "name": "customer_id",
+            "description": "THIS COLUMN IS UPDATED FOR TESTING",
+            "data_type": "INTEGER",
+            "constraints": [],
+            "quote": None,
+        },
+        "first_name": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_customers",
+            "generation": "generation_0",
+            "name": "first_name",
+            "data_type": "VARCHAR",
+            "constraints": [],
+            "quote": None,
+        },
+        "last_name": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_customers",
+            "generation": "generation_0",
+            "name": "last_name",
+            "data_type": "VARCHAR",
+            "constraints": [],
+            "quote": None,
+        },
+        "order_id": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_orders",
+            "generation": "generation_0",
+            "name": "order_id",
+            "data_type": "INTEGER",
+            "constraints": [],
+            "quote": None,
+        },
+        "order_date": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_orders",
+            "generation": "generation_0",
+            "name": "order_date",
+            "data_type": "DATE",
+            "constraints": [],
+            "quote": None,
+        },
+        "status": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_orders",
+            "generation": "generation_0",
+            "name": "status",
+            "data_type": "VARCHAR",
+            "constraints": [],
+            "quote": None,
+        },
+        "payment_id": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_payments",
+            "generation": "generation_0",
+            "name": "payment_id",
+            "data_type": "INTEGER",
+            "constraints": [],
+            "quote": None,
+        },
+        "payment_method": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_payments",
+            "generation": "generation_0",
+            "name": "payment_method",
+            "data_type": "VARCHAR",
+            "constraints": [],
+            "quote": None,
+        },
+        "amount": {
+            "progenitor": "model.jaffle_shop_duckdb.stg_payments",
+            "generation": "generation_0",
+            "name": "amount",
+            "data_type": "DOUBLE",
+            "constraints": [],
+            "quote": None,
+        },
+    }
+    target_node = manifest.nodes["model.jaffle_shop_duckdb.customers"]
+    family_tree = _build_node_ancestor_tree(manifest, target_node)
+    placeholders = [""]
+    assert _inherit_column_level_knowledge(manifest, family_tree, placeholders) == expect