Introduce code from Rust monorepo. This is a mess

tts/NeMo/tests/hydra/config1.yaml

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+dataset_name: dark

tts/NeMo/tests/hydra/config1_invalid.yaml

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+dataset_name: magic
+password: secret

tts/NeMo/tests/hydra/config_subdir/config2.yaml

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+dataset_name: ala_config2

tts/NeMo/tests/hydra/config_subdir/config2_invalid.yaml

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+dataset_name: ala_config2
+password: ala_secret2

tts/NeMo/tests/hydra/my_app.py

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+# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from dataclasses import dataclass
+
+import hydra
+from omegaconf import MISSING, OmegaConf
+
+from nemo.core.config import hydra_runner
+
+
+@dataclass
+class DefaultConfig:
+    """
+    This is structured config for this application.
+
+    It provides the schema used for validation of user-written spec file
+    as well as default values of the selected parameters.
+    """
+
+    # Dataset. Available options: [imdb, sst2]
+    dataset_name: str = MISSING
+
+
+@hydra_runner(config_name="DefaultConfig", schema=DefaultConfig)
+def my_app(cfg):
+    print(OmegaConf.to_yaml(cfg))
+    # Get dataset_name.
+    dataset_name = cfg.dataset_name
+
+
+if __name__ == "__main__":
+    my_app()

tts/NeMo/tests/hydra/test_hydra_runner.py

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+# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import subprocess
+import sys
+from os import path
+
+import pytest
+
+
+class TestHydraRunner:
+    @pytest.mark.integration
+    def test_no_config(self):
+        """"Test app without config - fields missing causes error.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py"
+
+        with pytest.raises(subprocess.CalledProcessError):
+            # Run the call as subprocess.
+            subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)
+
+    @pytest.mark.integration
+    def test_config1(self):
+        """"Test injection of valid config1.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py --config-name config1.yaml"
+
+        # Run the call as subprocess.
+        subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)
+
+        # Make sure that .hydra dir is not present.
+        assert not path.exists(f".hydra")
+        # Make sure that default hydra log file is not present.
+        assert not path.exists(f"my_app.log")
+
+    @pytest.mark.integration
+    def test_config1_invalid(self):
+        """"Test injection of invalid config1.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py --config-name config1_invalid.yaml"
+
+        with pytest.raises(subprocess.CalledProcessError):
+            # Run the call as subprocess.
+            subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)
+
+    @pytest.mark.integration
+    def test_config2(self):
+        """"Test injection of valid config2 from a different folder.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py --config-path config_subdir --config-name config2.yaml"
+
+        # Run the call as subprocess.
+        subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)
+
+        # Make sure that .hydra dir is not present.
+        assert not path.exists(f".hydra")
+        # Make sure that default hydra log file is not present.
+        assert not path.exists(f"my_app.log")
+
+    @pytest.mark.integration
+    def test_config2_invalid(self):
+        """"Test injection of invalid config2 from a different folder.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py --config-path config_subdir --config-name config2_invalid.yaml"
+
+        with pytest.raises(subprocess.CalledProcessError):
+            # Run the call as subprocess.
+            subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)
+
+    @pytest.mark.integration
+    def test_config2_filepath_schema(self):
+        """"Test injection of valid config2 - using namepath with schema is prohibited.
+        """
+        # Create system call.
+        call = "python tests/hydra/my_app.py --config-name config_subdir/config2_invalid.yaml"
+
+        with pytest.raises(subprocess.CalledProcessError):
+            # Run the call as subprocess.
+            subprocess.check_call(call, shell=True, stdout=sys.stdout, stderr=sys.stdout)