started tests
This commit is contained in:
John Lancaster
307
tests/test_dag.py
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307
tests/test_dag.py
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from __future__ import annotations
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import pytest
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from daglib.dag import DAG
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class TestDAGInit:
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"""Test DAG initialization."""
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def test_init_empty(self) -> None:
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g = DAG()
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assert len(g) == 0
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def test_default_callbacks_none(self) -> None:
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g = DAG()
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assert g.on_add is None
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assert g.on_remove is None
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class TestDAGAddEdge:
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"""Test adding edges."""
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def test_add_single_edge(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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assert "b" in g["a"]
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assert "a" in g.reverse["b"]
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def test_add_multiple_edges(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("a", "c")
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g.add_edge("b", "c")
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assert "b" in g["a"]
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assert "c" in g["a"]
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assert "c" in g["b"]
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def test_add_edge_creates_nodes(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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assert "a" in g._succ
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assert "b" in g._pred
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def test_self_loop_raises_error(self) -> None:
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g = DAG[str]()
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with pytest.raises(ValueError, match="Self-loops are not allowed"):
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g.add_edge("a", "a")
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def test_add_duplicate_edge_idempotent(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("a", "b")
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assert len(g["a"]) == 1
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class TestDAGRemoveEdge:
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"""Test removing edges."""
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def test_remove_existing_edge(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.remove_edge("a", "b")
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assert "b" not in g["a"]
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assert "a" not in g.reverse["b"]
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def test_remove_nonexistent_edge_missing_ok(self) -> None:
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g = DAG[str]()
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g.remove_edge("a", "b", missing_ok=True) # should not raise
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def test_remove_nonexistent_edge_error(self) -> None:
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g = DAG[str]()
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with pytest.raises(KeyError):
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g.remove_edge("a", "b", missing_ok=False)
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class TestDAGDiscardNode:
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"""Test node removal."""
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def test_discard_node_removes_outgoing_edges(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("a", "c")
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g.discard_node("a")
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assert "a" not in g._succ
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assert "a" not in g.reverse["b"]
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assert "a" not in g.reverse["c"]
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def test_discard_node_removes_incoming_edges(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "c")
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g.add_edge("b", "c")
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g.discard_node("c")
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assert "c" not in g._pred
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assert "c" not in g["a"]
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assert "c" not in g["b"]
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def test_discard_nonexistent_node(self) -> None:
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g = DAG[str]()
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g.discard_node("z") # should not raise
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class TestDAGGetItem:
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"""Test dictionary-style access."""
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def test_getitem_returns_dagset(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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dagset = g["a"]
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assert "b" in dagset
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def test_getitem_empty_node(self) -> None:
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g = DAG[str]()
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dagset = g["nonexistent"]
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assert len(dagset) == 0
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def test_getitem_mutation_updates_graph(self) -> None:
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g = DAG[str]()
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g["a"].add("b")
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assert "b" in g["a"]
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assert "a" in g.reverse["b"]
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def test_getitem_mutation_triggers_callbacks(self) -> None:
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added: list[tuple[str, str]] = []
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g = DAG[str]()
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g.on_add = lambda u, v: added.append((u, v))
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g["a"].add("b")
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assert ("a", "b") in added
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class TestDAGSetItem:
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"""Test dictionary-style assignment."""
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def test_setitem_with_set(self) -> None:
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g = DAG[str]()
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g["a"] = {"b", "c"}
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assert "b" in g["a"]
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assert "c" in g["a"]
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def test_setitem_with_list(self) -> None:
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g = DAG[str]()
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g["a"] = ["b", "c"]
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assert "b" in g["a"]
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assert "c" in g["a"]
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def test_setitem_with_string(self) -> None:
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g = DAG[str]()
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g["a"] = "b"
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assert "b" in g["a"]
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def test_setitem_with_single_item(self) -> None:
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g = DAG[int]()
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g[1] = 2
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assert 2 in g[1]
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def test_setitem_updates_reverse(self) -> None:
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g = DAG[str]()
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g["a"] = {"b", "c"}
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assert "a" in g.reverse["b"]
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assert "a" in g.reverse["c"]
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class TestDAGDelItem:
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"""Test del operation."""
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def test_delitem_removes_node(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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del g["a"]
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assert "a" not in g._succ
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class TestDAGIter:
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"""Test iteration."""
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def test_iter_empty(self) -> None:
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g = DAG[str]()
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assert list(g) == []
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def test_iter_returns_nodes(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("b", "c")
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nodes = set(g)
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assert "a" in nodes
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assert "b" in nodes
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class TestDAGLen:
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"""Test length (edge count)."""
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def test_len_empty(self) -> None:
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g = DAG[str]()
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assert len(g) == 0
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def test_len_counts_edges(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("a", "c")
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g.add_edge("b", "c")
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assert len(g) == 3
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def test_len_after_removal(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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g.add_edge("a", "c")
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g.remove_edge("a", "b")
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assert len(g) == 1
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class TestDAGReverse:
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"""Test reverse (predecessor) access."""
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def test_reverse_property(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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assert "a" in g.reverse["b"]
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assert len(g.reverse["a"]) == 0
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def test_reverse_multiple_predecessors(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "c")
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g.add_edge("b", "c")
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preds = g.reverse["c"]
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assert "a" in preds
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assert "b" in preds
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class TestDAGCallbacks:
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"""Test callback mechanisms."""
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def test_on_add_callback_via_setitem(self) -> None:
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added: list[tuple[str, str]] = []
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g = DAG[str]()
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g.on_add = lambda u, v: added.append((u, v))
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g["a"] = {"b", "c"}
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# Note: setitem doesn't trigger callbacks in current implementation
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def test_on_add_callback_via_getitem_mutation(self) -> None:
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added: list[tuple[str, str]] = []
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g = DAG[str]()
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g.on_add = lambda u, v: added.append((u, v))
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g["a"].add("b")
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assert ("a", "b") in added
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def test_on_remove_callback(self) -> None:
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removed: list[tuple[str, str]] = []
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g = DAG[str]()
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g.on_remove = lambda u, v: removed.append((u, v))
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g["a"].add("b")
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g["a"].discard("b")
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assert ("a", "b") in removed
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class TestDAGRepr:
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"""Test string representation."""
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def test_repr_empty(self) -> None:
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g = DAG[str]()
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r = repr(g)
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assert "DAG" in r
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assert "{}" in r
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def test_repr_with_edges(self) -> None:
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g = DAG[str]()
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g.add_edge("a", "b")
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r = repr(g)
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assert "DAG" in r
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assert "a" in r
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assert "b" in r
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class TestDAGComplexScenarios:
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"""Test complex usage patterns."""
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def test_chain_graph(self) -> None:
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g = DAG[str]()
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g["a"] = {"b"}
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g["b"] = {"c"}
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g["c"] = {"d"}
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assert "b" in g["a"]
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assert "c" in g["b"]
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assert "d" in g["c"]
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assert len(g) == 3
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def test_diamond_graph(self) -> None:
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g = DAG[str]()
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g["a"] = {"b", "c"}
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g["b"] = {"d"}
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g["c"] = {"d"}
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assert len(g.reverse["d"]) == 2
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def test_batch_operations(self) -> None:
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g = DAG[str]()
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g["a"] += {"b", "c", "d"}
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assert len(g["a"]) == 3
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g["a"] -= {"b"}
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assert len(g["a"]) == 2
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assert "b" not in g["a"]
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def test_type_hints_with_ints(self) -> None:
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g = DAG[int]()
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g[1] = {2, 3}
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g[2] = {4}
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assert 2 in g[1]
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assert 4 in g[2]
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assert len(g) == 3
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