fix: add __hash__ and __eq__ back to rdflib.paths.Path (#2292)

These methods were removed when `@total_ordering` was added, but
`@total_ordering` does not add them, so removing them essentially
removes functionality.

This change adds the methods back and adds tests to ensure they work
correctly.

All path related tests are also moved into one file.

- Closes <#2281>.
- Closes <#2242>.

rdflib/paths.py

@@ -229,6 +229,12 @@ def eval(
     ) -> Iterator[Tuple["_SubjectType", "_ObjectType"]]:
         raise NotImplementedError()
 
+    def __hash__(self):
+        return hash(repr(self))
+
+    def __eq__(self, other):
+        return repr(self) == repr(other)
+
     def __lt__(self, other: Any) -> bool:
         if not isinstance(other, (Path, Node)):
             raise TypeError(

test/test_paths_n3.py → test/test_path.py

@@ -3,13 +3,15 @@
 
 import pytest
 
-from rdflib import RDF, RDFS, Graph
+from rdflib import RDF, RDFS, Graph, URIRef
+from rdflib.namespace import DCAT, DCTERMS
 from rdflib.paths import (
     AlternativePath,
     InvPath,
     MulPath,
     NegatedPath,
     OneOrMore,
+    Path,
     SequencePath,
     ZeroOrMore,
     ZeroOrOne,
@@ -71,3 +73,45 @@ def test_paths_n3(
     logging.debug("path = %s", path)
     assert path.n3() == no_nsm
     assert path.n3(nsm) == with_nsm
+
+
+def test_mulpath_n3():
+    uri = "http://example.com/foo"
+    n3 = (URIRef(uri) * ZeroOrMore).n3()
+    assert n3 == "<" + uri + ">*"
+
+
+@pytest.mark.parametrize(
+    ["lhs", "rhs"],
+    [
+        (DCTERMS.temporal / DCAT.endDate, DCTERMS.temporal / DCAT.endDate),
+        (SequencePath(DCTERMS.temporal, DCAT.endDate), DCTERMS.temporal / DCAT.endDate),
+    ],
+)
+def test_eq(lhs: Path, rhs: Path) -> None:
+    logging.debug("lhs = %s/%r, rhs = %s/%r", type(lhs), lhs, type(rhs), rhs)
+    assert lhs == rhs
+
+
+@pytest.mark.parametrize(
+    ["lhs", "rhs"],
+    [
+        (DCTERMS.temporal / DCAT.endDate, DCTERMS.temporal / DCAT.endDate),
+        (SequencePath(DCTERMS.temporal, DCAT.endDate), DCTERMS.temporal / DCAT.endDate),
+    ],
+)
+def test_hash(lhs: Path, rhs: Path) -> None:
+    logging.debug("lhs = %s/%r, rhs = %s/%r", type(lhs), lhs, type(rhs), rhs)
+    assert hash(lhs) == hash(rhs)
+
+
+@pytest.mark.parametrize(
+    ["insert_path", "check_path"],
+    [
+        (DCTERMS.temporal / DCAT.endDate, DCTERMS.temporal / DCAT.endDate),
+        (SequencePath(DCTERMS.temporal, DCAT.endDate), DCTERMS.temporal / DCAT.endDate),
+    ],
+)
+def test_dict_key(insert_path: Path, check_path: Path) -> None:
+    d = {insert_path: "foo"}
+    assert d[check_path] == "foo"