Step 107a: add text mode toggle

editor/tests/step107a_test.cpp

@@ -0,0 +1,28 @@
+// Step 107a TDD Test: Text editor mode toggle persistence in BufferManager
+//
+// Tests:
+// 1. Default mode is Structured
+// 2. setBufferMode updates mode
+
+#include <cassert>
+#include <iostream>
+#include "BufferManager.h"
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    BufferManager bm;
+    bm.openBuffer("file1", "", "python");
+    assert(bm.getBufferMode("file1") == BufferManager::BufferMode::Structured);
+    std::cout << "Test 1 PASS: default mode structured" << std::endl;
+    ++passed;
+
+    bm.setBufferMode("file1", BufferManager::BufferMode::Text);
+    assert(bm.getBufferMode("file1") == BufferManager::BufferMode::Text);
+    std::cout << "Test 2 PASS: mode updated" << std::endl;
+    ++passed;
+
+    std::cout << "\n=== Step 107a Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}