code: def test_implicit_outputs(self):
      self.n.build("o", "cc", "i", implicit_outputs="io")
      self.assertEqual(
          """\
  build o | io: cc i
  """,
          self.out.getvalue(),
      )
  
imports: import unittest
  import ninja_syntax
label_desc: Use image node_id 4 for calling the TestBuild obj's underlying member method code with example usage: obj.test_implicit_outputs() without return types