Ensure empty version is properly handled

README.md

@@ -5,7 +5,7 @@
 <a href="https://travis-ci.com/Colin-b/keepachangelog"><img alt="Build status" src="https://api.travis-ci.com/Colin-b/keepachangelog.svg?branch=master"></a>
 <a href="https://travis-ci.com/Colin-b/keepachangelog"><img alt="Coverage" src="https://img.shields.io/badge/coverage-100%25-brightgreen"></a>
 <a href="https://github.com/psf/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a>
-<a href="https://travis-ci.com/Colin-b/keepachangelog"><img alt="Number of tests" src="https://img.shields.io/badge/tests-30 passed-blue"></a>
+<a href="https://travis-ci.com/Colin-b/keepachangelog"><img alt="Number of tests" src="https://img.shields.io/badge/tests-31 passed-blue"></a>
 <a href="https://pypi.org/project/keepachangelog/"><img alt="Number of downloads" src="https://img.shields.io/pypi/dm/keepachangelog"></a>
 </p>
 

tests/test_changelog_empty_version.py

@@ -0,0 +1,67 @@
+import os
+import os.path
+
+import pytest
+
+import keepachangelog
+
+
+@pytest.fixture
+def changelog(tmpdir):
+    changelog_file_path = os.path.join(tmpdir, "CHANGELOG.md")
+    with open(changelog_file_path, "wt") as file:
+        file.write(
+            """# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [] - 2018-06-01
+### Changed
+- Release note 1.
+- Release note 2.
+
+### Fixed
+- Bug fix 1
+- sub bug 1
+- sub bug 2
+- Bug fix 2
+
+### Security
+- Known issue 1
+- Known issue 2
+
+### Deprecated
+- Deprecated feature 1
+- Future removal 2
+
+### Removed
+- Deprecated feature 2
+- Future removal 1
+"""
+        )
+    return changelog_file_path
+
+
+def test_changelog_with_empty_version(changelog):
+    assert keepachangelog.to_dict(changelog) == {
+        "": {
+            "changed": ["Release note 1.", "Release note 2."],
+            "deprecated": ["Deprecated feature 1", "Future removal 2"],
+            "fixed": ["Bug fix 1", "sub bug 1", "sub bug 2", "Bug fix 2"],
+            "release_date": "2018-06-01",
+            "removed": ["Deprecated feature 2", "Future removal 1"],
+            "security": ["Known issue 1", "Known issue 2"],
+            "version": "",
+            "semantic_version": {
+                "buildmetadata": None,
+                "major": 0,
+                "minor": 0,
+                "patch": 0,
+                "prerelease": None,
+            },
+        },
+    }