test adapter pre hooks for unit testing

core/dbt/task/test.py

@@ -126,6 +126,8 @@ class TestRunner(CompileRunner):
     def execute_data_test(self, data_test: TestNode, manifest: Manifest) -> TestResultData:
         context = generate_runtime_model_context(data_test, self.config, manifest)
 
+        hook_ctx = self.adapter.pre_model_hook(context)
+
         materialization_macro = manifest.find_materialization_macro_by_name(
             self.config.project_name, data_test.get_materialization(), self.adapter.type()
         )
@@ -140,10 +142,13 @@ class TestRunner(CompileRunner):
                 "Invalid materialization context generated, missing config: {}".format(context)
             )
 
-        # generate materialization macro
-        macro_func = MacroGenerator(materialization_macro, context)
-        # execute materialization macro
-        macro_func()
+        try:
+            # generate materialization macro
+            macro_func = MacroGenerator(materialization_macro, context)
+            # execute materialization macro
+            macro_func()
+        finally:
+            self.adapter.post_model_hook(context, hook_ctx)
         # load results from context
         # could eventually be returned directly by materialization
         result = context["load_result"]("main")
@@ -198,6 +203,8 @@ class TestRunner(CompileRunner):
         # materialization, not compile the node.compiled_code
         context = generate_runtime_model_context(unit_test_node, self.config, unit_test_manifest)
 
+        hook_ctx = self.adapter.pre_model_hook(context)
+
         materialization_macro = unit_test_manifest.find_materialization_macro_by_name(
             self.config.project_name, unit_test_node.get_materialization(), self.adapter.type()
         )
@@ -213,16 +220,18 @@ class TestRunner(CompileRunner):
                 "Invalid materialization context generated, missing config: {}".format(context)
             )
 
-        # generate materialization macro
-        macro_func = MacroGenerator(materialization_macro, context)
-        # execute materialization macro
         try:
+            # generate materialization macro
+            macro_func = MacroGenerator(materialization_macro, context)
+            # execute materialization macro
             macro_func()
         except DbtBaseException as e:
             raise DbtRuntimeError(
                 f"An error occurred during execution of unit test '{unit_test_def.name}'. "
                 f"There may be an error in the unit test definition: check the data types.\n {e}"
             )
+        finally:
+            self.adapter.post_model_hook(context, hook_ctx)
 
         # load results from context
         # could eventually be returned directly by materialization

tests/functional/unit_testing/fixtures.py

@@ -116,6 +116,23 @@ unit_tests:
         tags: test_this
 """
 
+test_my_model_pass_yml = """
+unit_tests:
+  - name: test_my_model
+    model: my_model
+    given:
+      - input: ref('my_model_a')
+        rows:
+          - {id: 1, a: 1}
+      - input: ref('my_model_b')
+        rows:
+          - {id: 1, b: 2}
+          - {id: 2, b: 2}
+    expect:
+      rows:
+        - {c: 3}
+"""
+
 
 test_my_model_simple_fixture_yml = """
 unit_tests:

tests/functional/unit_testing/test_ut_adapter_hooks.py

@@ -0,0 +1,49 @@
+from unittest import mock
+
+import pytest
+
+from dbt.tests.util import run_dbt
+from dbt_common.exceptions import CompilationError
+from tests.functional.unit_testing.fixtures import (
+    my_model_a_sql,
+    my_model_b_sql,
+    my_model_sql,
+    test_my_model_pass_yml,
+)
+
+
+class BaseUnitTestAdapterHook:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_model.sql": my_model_sql,
+            "my_model_a.sql": my_model_a_sql,
+            "my_model_b.sql": my_model_b_sql,
+            "test_my_model.yml": test_my_model_pass_yml,
+        }
+
+
+class TestUnitTestAdapterHookPasses(BaseUnitTestAdapterHook):
+    def test_unit_test_runs_adapter_pre_hook(self, project):
+        results = run_dbt(["run"])
+        assert len(results) == 3
+
+        mock_pre_model_hook = mock.Mock()
+        with mock.patch.object(type(project.adapter), "pre_model_hook", mock_pre_model_hook):
+            results = run_dbt(["test", "--select", "test_name:test_my_model"], expect_pass=True)
+
+            assert len(results) == 1
+            mock_pre_model_hook.assert_called_once()
+
+
+class TestUnitTestAdapterHookFails(BaseUnitTestAdapterHook):
+    def test_unit_test_runs_adapter_pre_hook_fails(self, project):
+        results = run_dbt(["run"])
+        assert len(results) == 3
+
+        mock_pre_model_hook = mock.Mock()
+        mock_pre_model_hook.side_effect = CompilationError("exception from adapter.pre_model_hook")
+        with mock.patch.object(type(project.adapter), "pre_model_hook", mock_pre_model_hook):
+            run_dbt(["test", "--select", "test_name:test_my_model"], expect_pass=False)
+
+            mock_pre_model_hook.assert_called_once()