How to use the anyconfig.api.single_load function in anyconfig

def test_19_dump_and_single_load_with_validation(self):
        if not anyconfig.schema.JSONSCHEMA_IS_AVAIL:
            skip_test()

        cnf = CNF_0
        scm = SCM_0

        cnf_path = os.path.join(self.workdir, "cnf_19.json")
        scm_path = os.path.join(self.workdir, "scm_19.json")

        TT.dump(cnf, cnf_path)
        TT.dump(scm, scm_path)
        self.assertTrue(os.path.exists(cnf_path))
        self.assertTrue(os.path.exists(scm_path))

        cnf_1 = TT.single_load(cnf_path, ac_schema=scm_path)

        self.assertFalse(cnf_1 is None)  # Validation should succeed.
        self.assertTrue(dicts_equal(cnf_1, cnf), cnf_1)

        cnf_2 = cnf.copy()
        cnf_2["a"] = "aaa"  # It's type should be integer not string.
        cnf_2_path = os.path.join(self.workdir, "cnf_19_2.json")
        TT.dump(cnf_2, cnf_2_path)
        self.assertTrue(os.path.exists(cnf_2_path))

        cnf_3 = TT.single_load(cnf_2_path, ac_schema=scm_path)
        self.assertTrue(cnf_3 is None)  # Validation should fail.

def test_12_dump_and_single_load__no_parser(self):
        self.assertRaises(TT.UnknownFileTypeError,
                          TT.single_load, "dummy.ext_not_exist")

def test_39_single_load__w_validation(self):
        (cnf, scm) = (CNF_0, SCM_0)
        cpath = os.path.join(self.workdir, "cnf.json")
        spath = os.path.join(self.workdir, "scm.json")

        TT.dump(cnf, cpath)
        TT.dump(scm, spath)

        cnf1 = TT.single_load(cpath, ac_schema=spath)
        self.assert_dicts_equal(cnf, cnf1)

def test_10__single_load(self):
        res = TT.single_load(self.a_path)
        self.assert_dicts_equal(res, self.cnf)

def test_10_single_load_w_validation(self):
        cnf_path = os.path.join(self.workdir, "cnf.json")
        scm_path = os.path.join(self.workdir, "scm.json")
        TT.dump(CNF_0, cnf_path)
        TT.dump(SCM_0, scm_path)

        cnf_2 = TT.single_load(cnf_path, ac_context={}, ac_schema=scm_path)

        self.assertEqual(cnf_2["name"], CNF_0["name"])
        self.assertEqual(cnf_2["a"], CNF_0["a"])
        self.assertEqual(cnf_2["b"]["b"], CNF_0["b"]["b"])
        self.assertEqual(cnf_2["b"]["c"], CNF_0["b"]["c"])

def _load_and_dump_with_opened_files(self, filename, rmode='r', wmode='w',
                                         **oopts):
        cpath = os.path.join(self.workdir, filename)

        with TT.open(cpath, 'w', **oopts) as out:
            TT.dump(self.cnf, out)
            self.assertTrue(_is_file_object(out))
            self.assertEqual(out.mode, wmode)

        with TT.open(cpath, 'rb', **oopts) as inp:
            cnf1 = TT.single_load(inp)
            self.assertTrue(_is_file_object(inp))
            self.assertEqual(inp.mode, rmode)
            cpair = (self.cnf, cnf1)
            self.assertTrue(dicts_equal(*cpair), "%r vs. %r" % cpair)

def test_12__single_load__ac_parser(self):
        res = TT.single_load(self.a_path, ac_parser="json")
        self.assert_dicts_equal(res, self.cnf)

def test_18_single_load__templates(self):
        if not anyconfig.template.SUPPORTED:
            return

        a_path = os.path.join(resdir(), "30-00-cnf.json")
        a2_path = os.path.join(resdir(), "00-00-cnf.json")  # Not a template

        cnf1 = TT.single_load(a_path, ac_template=True, ac_context=self.cnf)
        self.assertTrue(dicts_equal(self.cnf, cnf1), str(cnf1))

        cnf2 = TT.single_load(a2_path, ac_template=True)
        self.assertEqual(cnf2["a"], 1)

def test_16_single_load__template(self):
        if not anyconfig.template.SUPPORTED:
            return

        cpath = os.path.join(resdir(), "30-00-template-cnf.json")
        cnf = TT.single_load(cpath, ac_template=True, ac_context=self.cnf)
        self.assert_dicts_equal(cnf, self.cnf)

        spath = os.path.join(resdir(), "30-00-template-cnf-ng-scm.json")

        # Validation should fail.
        cnf2 = TT.single_load(cpath, ac_template=True, ac_context=self.cnf,
                              ac_schema=spath)
        self.assertTrue(cnf2 is None)