human
I wrote the below code

    def on_env_read_docs_1(app, env, docnames):
        pass
    app.connect('env-before-read-docs', on_env_read_docs_1)
    read_docnames = env.update(app.config, app.srcdir, app.doctreedir)
    assert ((len(read_docnames) > 2) and (read_docnames == sorted(read_docnames)))
    def on_env_read_docs_2(app, env, docnames):
        docnames.remove('images')
    app.connect('env-before-read-docs', on_env_read_docs_2)
    read_docnames = env.update(app.config, app.srcdir, app.doctreedir)
    assert (len(read_docnames) == 2)

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def test_env_read_docs():