code: def test_dependencies(self, dep_trees, required, disallowed):
      if required in EXCEPTIONS and disallowed in EXCEPTIONS[required]:
          pytest.skip(
              "Validation skipped for {} dependency of {}".format(
                  disallowed, required
              )
          )
  
      tree = dep_trees[required]
      assert tree is not None
      assert disallowed not in tree
  
imports: import subprocess
  import pytest
label_desc: Use image node_id 1 for calling the TestDependencies obj's underlying member method code with example usage: obj.test_dependencies(dep_trees, required, disallowed) without return types