Step 120: unify undo/redo snapshots

editor/tests/step120_test.cpp

@@ -0,0 +1,42 @@
+// Step 120 TDD Test: Orchestrator snapshot undo/redo
+#include "Orchestrator.h"
+#include <iostream>
+
+static void expect(bool cond, const std::string& name, int& passed, int& failed) {
+    if (cond) {
+        std::cout << "Test " << (passed + failed + 1) << " PASS: " << name << "\n";
+        ++passed;
+    } else {
+        std::cout << "Test " << (passed + failed + 1) << " FAIL: " << name << "\n";
+        ++failed;
+    }
+}
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    Orchestrator orch;
+    Module a("m1", "A", "python");
+    Module b("m2", "B", "python");
+
+    orch.recordSnapshot("one", &a);
+    orch.recordSnapshot("two", &b);
+
+    std::string text;
+    std::unique_ptr<Module> ast;
+    bool undoOk = orch.undoSnapshot(text, ast);
+    expect(undoOk && text == "two" && ast && ast->name == "B", "undo snapshot", passed, failed);
+
+    bool undoOk2 = orch.undoSnapshot(text, ast);
+    expect(undoOk2 && text == "one" && ast && ast->name == "A", "undo snapshot (second)", passed, failed);
+
+    bool redoOk = orch.redoSnapshot(text, ast);
+    expect(redoOk && text == "one" && ast && ast->name == "A", "redo snapshot (first)", passed, failed);
+
+    bool redoOk2 = orch.redoSnapshot(text, ast);
+    expect(redoOk2 && text == "two" && ast && ast->name == "B", "redo snapshot (second)", passed, failed);
+
+    std::cout << "\n=== Step 120 Results: " << passed << " passed, " << failed << " failed ===\n";
+    return failed == 0 ? 0 : 1;
+}