Implement "package unpublish" CLI

tests/package/test_spec.py

@@ -0,0 +1,27 @@
+# Copyright (c) 2014-present PlatformIO <contact@platformio.org>
+#
+# 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 platformio.package.spec import PackageSpec
+
+
+def test_parser():
+    inputs = [
+        ("foo", (None, "foo", None)),
+        ("@org/foo", ("org", "foo", None)),
+        ("@org/foo @ 1.2.3", ("org", "foo", "1.2.3")),
+        ("bar @ 1.2.3", (None, "bar", "1.2.3")),
+        ("cat@^1.2", (None, "cat", "^1.2")),
+    ]
+    for raw, result in inputs:
+        assert PackageSpec.parse(raw) == result