Checkpoint experiments through SWE pilot v2

tests/test_diagnostic.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+import runpy
+
+import pytest
+
+script = runpy.run_path(str(Path(__file__).parents[1] / "scripts" / "diagnostic.py"))
+
+
+def test_defaults_are_preview_and_two_samples():
+    args = script["parser"]().parse_args(["--out", "logs/example"])
+    config, seeds = script["configuration"](args)
+    assert not args.execute
+    assert len(config["ids"]) == 2
+    assert config["concurrency"] == 2
+    assert not seeds
+
+
+def test_large_diagnostic_batch_rejected():
+    args = script["parser"]().parse_args(["--out", "logs/example", "--ids", *map(str, range(40))])
+    with pytest.raises(ValueError, match="1–8"):
+        script["configuration"](args)
+
+
+def test_seed_manifest_identifies_input(tmp_path):
+    p = tmp_path / "reference.py"
+    p.write_text("# actual donor content\n")
+    args = script["parser"]().parse_args(["--out", "logs/example", "--seed-file", str(p)])
+    config, seeds = script["configuration"](args)
+    assert seeds[p.name] == p.read_text()
+    assert config["seed_files"][p.name]["source"] == str(p.resolve())
+    assert len(config["seed_files"][p.name]["sha256"]) == 64