Initial commit: manifoldbt public repo

Python DSL, examples, docs, benchmarks, and tests.
Rust engine distributed as pre-compiled wheel via PyPI.

python/tests/test_strategy.py

@@ -0,0 +1,54 @@
+"""Tests for Strategy serialization."""
+import json
+
+from manifoldbt.expr import col, lit, param, when
+from manifoldbt.strategy import Strategy
+
+
+def test_strategy_serializes_to_valid_json():
+    size = param("size", default=1.0, range=(0.5, 2.0))
+    signal = when(col("close") > col("close").lag(1), lit(1.0), lit(0.0))
+
+    strategy = Strategy(
+        name="test_strategy",
+        signals={"trend": signal},
+        position_sizing=col("trend") * size,
+        parameters={"size": size},
+    )
+
+    result = json.loads(strategy.to_json())
+
+    assert result["name"] == "test_strategy"
+    assert "trend" in result["signals"]
+    assert result["parameters"]["size"]["default"] == {"Float64": 1.0}
+    assert result["parameters"]["size"]["range"] == [
+        {"Float64": 0.5},
+        {"Float64": 2.0},
+    ]
+
+
+def test_strategy_no_params():
+    strategy = Strategy(
+        name="simple",
+        signals={"signal": lit(1.0)},
+        position_sizing=col("signal"),
+    )
+
+    result = json.loads(strategy.to_json())
+    assert result["name"] == "simple"
+    assert result["parameters"] == {}
+    assert result["constraints"] == []
+    assert result["signals"]["signal"] == {"Literal": {"Float64": 1.0}}
+    assert result["position_sizing"] == {"Column": "signal"}
+
+
+def test_strategy_metadata():
+    strategy = Strategy(
+        name="documented",
+        signals={"s": lit(1.0)},
+        position_sizing=col("s"),
+        description="A documented strategy",
+    )
+
+    result = json.loads(strategy.to_json())
+    assert result["metadata"]["description"] == "A documented strategy"