Add test for unit testing model that depends on input model with alias (#12217)

tests/functional/unit_testing/test_ut_aliases.py

@@ -0,0 +1,52 @@
+import pytest
+
+from dbt.tests.util import run_dbt
+
+model_with_alias_sql = """
+{{
+    config(
+        alias='beautiful_alias',
+        schema='events',
+        materialized='view'
+    )
+}}
+
+select
+    'foo' as foo
+"""
+
+model_tested = """
+select * from {{ ref('model_with_alias') }}
+"""
+
+unit_test_yml = """
+unit_tests:
+  - name: test_model_with_alias_input
+    model: model_tested
+    given:
+      - input: ref('model_with_alias')
+        rows:
+          - {foo: bar }
+          - {foo: foo }
+    expect:
+      rows:
+          - {foo: bar }
+          - {foo: foo }
+"""
+
+
+class TestUnitTestInputWithAlias:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "model_with_alias.sql": model_with_alias_sql,
+            "model_tested.sql": model_tested,
+            "unit_test.yml": unit_test_yml,
+        }
+
+    def test_input_with_alias(self, project):
+        results = run_dbt(["run"])
+        assert len(results) == 2
+
+        results = run_dbt(["test"])
+        assert len(results) == 1