diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe8d422473131..894d43d976f08 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,24 +5,6 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
-## [unreleased.Features] - YYYY-MM-DD
-
-### Added
-
-
-### Changed
-
-
-### Deprecated
-
-
-### Removed
-
-
-### Fixed
-
-
-
 ## [unreleased.BugFix] - YYYY-MM-DD
 
 ### Added
diff --git a/tests/__init__.py b/tests/__init__.py
index 981d685430da9..1bb81c466e6eb 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,3 +1,16 @@
+# Copyright The PyTorch Lightning team.
+#
+# 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 os
 
 import numpy as np
diff --git a/tests/collect_env_details.py b/tests/collect_env_details.py
index 1d443795d2876..2b8c4b3fafeed 100644
--- a/tests/collect_env_details.py
+++ b/tests/collect_env_details.py
@@ -1,3 +1,16 @@
+# Copyright The PyTorch Lightning team.
+#
+# 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.
 """Diagnose your system and show basic information
 
 This server mainly to get detail info for better bug reporting.
diff --git a/tests/conftest.py b/tests/conftest.py
index ad4b7169456a8..07188fed4dbed 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,17 @@
+# Copyright The PyTorch Lightning team.
+#
+# 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 sys
 import threading
 from functools import partial, wraps
diff --git a/tests/metrics/regression/test_ssim.py b/tests/metrics/regression/test_ssim.py
index f581188e89fce..8bb304850e3f2 100644
--- a/tests/metrics/regression/test_ssim.py
+++ b/tests/metrics/regression/test_ssim.py
@@ -53,9 +53,7 @@ def _sk_metric(preds, target, data_range, multichannel):
 class TestSSIM(MetricTester):
     atol = 6e-5
 
-    # TODO: for some reason this test hangs with ddp=True
-    # @pytest.mark.parametrize("ddp", [True, False])
-    @pytest.mark.parametrize("ddp", [False])
+    @pytest.mark.parametrize("ddp", [True, False])
     @pytest.mark.parametrize("dist_sync_on_step", [True, False])
     def test_ssim(self, preds, target, multichannel, ddp, dist_sync_on_step):
         self.run_class_metric_test(
diff --git a/tests/metrics/utils.py b/tests/metrics/utils.py
index c607a466b2068..4bd6608ce3fcf 100644
--- a/tests/metrics/utils.py
+++ b/tests/metrics/utils.py
@@ -11,6 +11,11 @@
 
 from pytorch_lightning.metrics import Metric
 
+try:
+    set_start_method("spawn")
+except RuntimeError:
+    pass
+
 NUM_PROCESSES = 2
 NUM_BATCHES = 10
 BATCH_SIZE = 32
@@ -165,10 +170,7 @@ def setup_class(self):
         """Setup the metric class. This will spawn the pool of workers that are
         used for metric testing and setup_ddp
         """
-        try:
-            set_start_method("spawn")
-        except RuntimeError:
-            pass
+
         self.poolSize = NUM_PROCESSES
         self.pool = Pool(processes=self.poolSize)
         self.pool.starmap(setup_ddp, [(rank, self.poolSize) for rank in range(self.poolSize)])
diff --git a/tests/test_profiler.py b/tests/test_profiler.py
index 3bce379c1115c..4728b11582dfc 100644
--- a/tests/test_profiler.py
+++ b/tests/test_profiler.py
@@ -1,3 +1,17 @@
+# Copyright The PyTorch Lightning team.
+#
+# 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 os
 import time
 from pathlib import Path