Step 198: virtual scrolling for large files

editor/tests/step198_test.cpp

@@ -0,0 +1,28 @@
+// Step 198: Virtual scrolling for large files.
+
+#include <cassert>
+#include <fstream>
+#include <string>
+
+static std::string readFile(const std::string& path) {
+    std::ifstream f(path);
+    if (!f.is_open()) return {};
+    return std::string((std::istreambuf_iterator<char>(f)),
+                       std::istreambuf_iterator<char>());
+}
+
+static void assertContains(const std::string& text, const std::string& needle) {
+    assert(text.find(needle) != std::string::npos);
+}
+
+int main() {
+    const std::string rendering = readFile("src/CodeEditorRendering.h");
+
+    assertContains(rendering, "virtualBuffer");
+    assertContains(rendering, "viewFirst");
+    assertContains(rendering, "viewLines");
+    assertContains(rendering, "isHiddenLine");
+
+    printf("step198_test: all assertions passed\n");
+    return 0;
+}