Squash Odysseus development history

tests/test_editor_history_budget_js.py

@@ -0,0 +1,60 @@
+import json
+import subprocess
+import textwrap
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+MODULE = (ROOT / "static/js/editor/history-budget.js").as_uri()
+
+
+def run_node(script: str):
+    result = subprocess.run(
+        ["node", "--input-type=module", "-e", script], cwd=ROOT,
+        text=True, capture_output=True, check=True,
+    )
+    return json.loads(result.stdout)
+
+
+def test_history_budget_drops_oldest_snapshots_by_bytes_and_count():
+    script = textwrap.dedent(
+        f"""
+        import {{ trimHistoryStack }} from {json.dumps(MODULE)};
+        const byBytes = [{{id:1,_bytes:80}},{{id:2,_bytes:80}},{{id:3,_bytes:80}}];
+        const bytes = trimHistoryStack(byBytes, 10, 170);
+        const byCount = [{{id:1,_bytes:1}},{{id:2,_bytes:1}},{{id:3,_bytes:1}}];
+        trimHistoryStack(byCount, 2, 100);
+        console.log(JSON.stringify({{byBytes:byBytes.map(x=>x.id),bytes,byCount:byCount.map(x=>x.id)}}));
+        """
+    )
+    assert run_node(script) == {"byBytes": [2, 3], "bytes": 160, "byCount": [2, 3]}
+
+
+def test_history_budget_keeps_latest_oversized_snapshot():
+    script = textwrap.dedent(
+        f"""
+        import {{ trimHistoryStack }} from {json.dumps(MODULE)};
+        const stack = [{{id:1,_bytes:20}},{{id:2,_bytes:500}}];
+        const bytes = trimHistoryStack(stack, 10, 100);
+        console.log(JSON.stringify({{ids:stack.map(x=>x.id),bytes}}));
+        """
+    )
+    assert run_node(script) == {"ids": [2], "bytes": 500}
+
+
+def test_history_budget_counts_saved_selections_and_group_masks():
+    script = textwrap.dedent(
+        f"""
+        import {{ snapshotByteSize }} from {json.dumps(MODULE)};
+        const imageData=bytes=>({{data:{{byteLength:bytes}}}});
+        const snapshot={{
+          wand:{{imageData:imageData(10)}},
+          lastSelection:{{imageData:imageData(20)}},
+          savedSelections:[{{imageData:imageData(30)}},{{imageData:imageData(40)}}],
+          layerGroups:[{{masks:[{{imageData:imageData(50)}}]}}],
+          layers:[{{imageData:imageData(60),masks:[{{imageData:imageData(70)}}]}}],
+        }};
+        console.log(JSON.stringify(snapshotByteSize(snapshot)));
+        """
+    )
+    assert run_node(script) == 280