Add path manipulation and validation

tests/test_path.py

@@ -0,0 +1,95 @@
+"""Tests for path handling
+"""
+
+import pytest
+
+from earthsnake.identity import Identity
+from earthsnake.path import Path
+
+
+@pytest.mark.parametrize(
+    'path,error_msg',
+    [
+        pytest.param('/', 'Path length must be between 2 and 512', id='short'),
+        pytest.param('/' + 'a' * 512, 'Path length must be between 2 and 512', id='long'),
+        pytest.param('badstart', 'Paths must start with a /', id='no_slash_start'),
+        pytest.param('/@atstart', 'Paths must not start with /@', id='slashat_start'),
+        pytest.param('/double//slash', 'Paths must not contain //', id='double_slash'),
+        pytest.param('/multiple!excl!', 'Only one ! is allowed in paths', id='multi_excl'),
+        pytest.param('/test/', 'Paths must not end with a /', id='trailing_slash'),
+    ],
+)
+def test_invalid(path: str, error_msg: str) -> None:
+    """Test if validation fails for invalid paths"""
+
+    with pytest.raises(ValueError) as ctx:
+        Path.validate(path)
+
+    assert error_msg in str(ctx.value)
+
+
+def test_invalid_non_ephemeral() -> None:
+    """Test validating ephemeral paths when ephemeral is not allowed"""
+
+    with pytest.raises(ValueError) as ctx:
+        Path.validate('/ephemeral!')
+
+    assert 'Only ephemeral paths may contain !' in str(ctx.value)
+
+
+def test_validate_ephemeral() -> None:
+    """Test validation of ephemeral paths"""
+
+    assert Path.validate('/ephemeral!', allow_ephemeral=True) is None
+
+
+def test_is_ephemeral() -> None:
+    """Test the is_ephemeral property"""
+
+    assert Path('/ephemeral!').is_ephemeral
+    assert not Path('/non-ephemeral').is_ephemeral
+
+
+def test_is_shared() -> None:
+    """Test the is_shared property"""
+
+    assert Path('/test').is_shared
+    assert not Path('/test/~').is_shared
+
+
+@pytest.mark.parametrize(
+    'author,path,allowed',
+    [
+        pytest.param(
+            '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            '/test',
+            True,
+            id='shared',
+        ),
+        pytest.param(
+            '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            '/test/~@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            True,
+            id='allowed',
+        ),
+        pytest.param(
+            '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            '/test/~@abob.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            False,
+            id='someone_else',
+        ),
+        pytest.param(
+            '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            '/test/~',
+            False,
+            id='strictly_forbidden',
+        ),
+    ],
+)
+def test_can_write(author: str, path: str, allowed: bool) -> None:
+    """Test the can_write method"""
+
+    path_obj = Path(path)
+    identity = Identity.from_address(author)
+
+    assert path_obj.can_write(identity) is allowed