doc: temp change to illustrate a point

core/dbt/parser/unit_tests.py

@@ -104,6 +104,15 @@ def parse_unit_test_case(self, test_case: UnitTestDefinition):
             self.manifest,
             test_case.package_name,
         )
+
+        # just to illustrate the issue in #..., but this change is obviously not
+        # the correct solution. I’ll wait for a discussion before writing any more
+        # advanced code.
+
+        if "var" not in ctx:
+            ctx["var"] = lambda var_name, default =None: default
+        if "env_var" not in ctx:
+            ctx["env_var"] = lambda var_name, default=None: default
         get_rendered(unit_test_node.raw_code, ctx, unit_test_node, capture_macros=True)
         # unit_test_node now has a populated refs/sources