diff --git a/.github/workflows/UnitTesting.yml b/.github/workflows/UnitTesting.yml
index 4043d16..d1c2251 100644
--- a/.github/workflows/UnitTesting.yml
+++ b/.github/workflows/UnitTesting.yml
@@ -192,6 +192,7 @@ jobs:
         if: matrix.system == 'windows'
         run: |
           $env:ENVIRONMENT_NAME = "${{ matrix.envname }}"
+          $env:PYTHONPATH = (Get-Location).ToString()
           cd "${{ inputs.tests_directory || '.' }}"
           $PYTEST_ARGS = if ("${{ inputs.artifact }}") { "--junitxml=TestReportSummary.xml" } else { "" }
           python -m pytest -rA ${{ inputs.unittest_directory }} $PYTEST_ARGS --color=yes
diff --git a/tests/unit/Platform/__init__.py b/tests/unit/Platform/__init__.py
new file mode 100644
index 0000000..248a6c3
--- /dev/null
+++ b/tests/unit/Platform/__init__.py
@@ -0,0 +1,116 @@
+# ==================================================================================================================== #
+#             _____           _ _                  _        _   _                                                      #
+#  _ __  _   |_   _|__   ___ | (_)_ __   __ _     / \   ___| |_(_) ___  _ __  ___                                      #
+# | '_ \| | | || |/ _ \ / _ \| | | '_ \ / _` |   / _ \ / __| __| |/ _ \| '_ \/ __|                                     #
+# | |_) | |_| || | (_) | (_) | | | | | | (_| |_ / ___ \ (__| |_| | (_) | | | \__ \                                     #
+# | .__/ \__, ||_|\___/ \___/|_|_|_| |_|\__, (_)_/   \_\___|\__|_|\___/|_| |_|___/                                     #
+# |_|    |___/                          |___/                                                                          #
+# ==================================================================================================================== #
+# Authors:                                                                                                             #
+#   Patrick Lehmann                                                                                                    #
+#                                                                                                                      #
+# License:                                                                                                             #
+# ==================================================================================================================== #
+# Copyright 2017-2023 Patrick Lehmann - Bötzingen, Germany                                                             #
+#                                                                                                                      #
+# 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.                                                                                       #
+#                                                                                                                      #
+# SPDX-License-Identifier: Apache-2.0                                                                                  #
+# ==================================================================================================================== #
+#
+"""Unit tests for TBD."""
+from os       import getenv as os_getenv
+from pytest   import mark
+from unittest import TestCase
+
+from pyTooling.Platform import Platform
+
+
+if __name__ == "__main__":  # pragma: no cover
+	print("ERROR: you called a testcase declaration file as an executable module.")
+	print("Use: 'python -m unitest <testcase module>'")
+	exit(1)
+
+
+class AnyPlatform(TestCase):
+	expected = os_getenv("ENVIRONMENT_NAME", default="Windows (x86-64)")
+
+	@mark.skipif(os_getenv("ENVIRONMENT_NAME", "skip") == "skip", reason="Skipped when environment variable 'ENVIRONMENT_NAME' isn't set.")
+	def test_PlatformString(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Linux (x86-64)" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_NativeLinux' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_NativeLinux(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("MacOS (x86-64)" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_NativeMacOS' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_NativeMacOS(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows (x86-64)" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_NativeWindows' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_NativeWindows(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - MSYS" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_MSYS' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_MSYS(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - MinGW32" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_MinGW32' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_MinGW32(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - MinGW64" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_MinGW64' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_MinGW64(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - UCRT64" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_UCRT64' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_UCRT64(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - Clang32" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_Clang32' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_Clang32(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)
+
+	@mark.skipif("Windows+MSYS2 (x86-64) - Clang64" != os_getenv("ENVIRONMENT_NAME", "skip"), reason=f"Skipped 'test_Clang64' when environment variable 'ENVIRONMENT_NAME' doesn't match. {os_getenv('ENVIRONMENT_NAME', 'skip')}")
+	def test_Clang64(self) -> None:
+		platform = Platform()
+
+		print()
+		print(platform)