diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5be77c7..244ff1a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -18,8 +18,8 @@ jobs:
           name: install python dependencies
           command: pip install -r requirements.txt && pip install pytest pytest-xdist
       - run:
-          name: pytest
-          command: pytest -W ignore::FutureWarning -W ignore::DeprecationWarning -vv --forked
+          name: run tests
+          command: make test
       - save_cache:
           key: models-{{ checksum "spleeter/model/__init__.py" }}
           paths:
@@ -42,8 +42,8 @@ jobs:
           name: install python dependencies
           command: pip install -r requirements.txt && pip install pytest pytest-xdist
       - run:
-          name: pytest
-          command: pytest -W ignore::FutureWarning -W ignore::DeprecationWarning -vv --forked
+          name: run tests
+          command: make test
       - save_cache:
           key: models-{{ checksum "spleeter/model/__init__.py" }}
           paths:
@@ -57,8 +57,8 @@ jobs:
     steps:
       - checkout
       - run:  
-          name: package
-          command: python setup.py sdist
+          name: package source distribution
+          command: make build
       - save_cache:
           key: sdist-{{ .Branch }}-{{ checksum "setup.py" }}
           paths:
@@ -78,7 +78,7 @@ jobs:
           # TODO: Infer destination regarding of branch.
           #       - master => production PyPi
           #       - development => testing PyPi
-          command: pip install twine && twine upload dist/*
+          command: make deploy
 
   # =======================================================================================
   # Conda distribution.
diff --git a/Makefile b/Makefile
index 989f5ce..c2019ce 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # =======================================================
-# Build script for distribution packaging.
+# Library lifecycle management.
 #
 # @author Deezer Research <research@deezer.com>
 # @licence MIT Licence
@@ -9,22 +9,29 @@ clean:
 	rm -Rf *.egg-info
 	rm -Rf dist
 
+
 build:
 	@echo "=== Build CPU bdist package" 
-	@python3 setup.py sdist
+	python3 setup.py sdist
 	@echo "=== CPU version checksum"
 	@openssl sha256 dist/*.tar.gz
 
 build-gpu:
 	@echo "=== Build GPU bdist package" 
-	@python3 setup.py sdist --target gpu
+	python3 setup.py sdist --target gpu
 	@echo "=== GPU version checksum"
 	@openssl sha256 dist/*.tar.gz
 
-upload:
+pip-dependencies:
+	pip install twine
+
+test: pip-dependencies
+	pytest -W ignore::FutureWarning -W ignore::DeprecationWarning -vv --forked
+
+test-distribution: pip-dependencies
+	bash tests/test_pypi_sdist.sh
+
+deploy: pip-dependencies
 	twine upload dist/*
 
-test-upload:
-	twine upload --repository-url https://test.pypi.org/legacy/ dist/*
-
-all: clean build build-gpu upload
\ No newline at end of file
+all: clean test build build-gpu upload
diff --git a/tests/test_pypi_sdist.sh b/tests/test_pypi_sdist.sh
new file mode 100644
index 0000000..c514062
--- /dev/null
+++ b/tests/test_pypi_sdist.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+######################################################################
+# Script that performs PyPi packaging test.
+#
+# @author Deezer Research <research@deezer.com>
+# @version 1.0.0
+######################################################################
+
+	twine upload --repository-url https://test.pypi.org/legacy/ dist/*
\ No newline at end of file
diff --git a/tests/test_separator.py b/tests/test_separator.py
index 54c9c18..c570e64 100644
--- a/tests/test_separator.py
+++ b/tests/test_separator.py
@@ -7,6 +7,8 @@ __email__ = 'research@deezer.com'
 __author__ = 'Deezer Research'
 __license__ = 'MIT License'
 
+import filecmp
+
 from os.path import exists, join
 from tempfile import TemporaryDirectory
 
@@ -33,6 +35,12 @@ def test_separate(configuration, instruments):
     assert len(prediction) == len(instruments)
     for instrument in instruments:
         assert instrument in prediction
+    for instrument in instruments:
+        track = prediction[instrument]
+        assert not (waveform == track).all()
+        for compared in instruments:
+            if instrument != compared:
+                assert not (track == prediction[compared]).all()
 
 
 @pytest.mark.parametrize('configuration, instruments', TEST_CONFIGURATIONS)
@@ -45,4 +53,9 @@ def test_separate_to_file(configuration, instruments):
             directory)
         for instrument in instruments:
             assert exists(join(directory, '{}.wav'.format(instrument)))
-            # TODO: Consider testing generated file as well.
+        for instrument in instruments:
+            for compared in instrument:
+                if instrument != compared:
+                    assert not filecmp.cmp(
+                        join(directory, '{}.wav'.format(instrument)),
+                        join(directory, '{}.wav'.format(compared)))