1 files changed, 27 insertions, 0 deletions
diff --git a/test_arena.cpp b/test_arena.cpp
new file mode 100755
index 0000000..545e4ba
--- /dev/null
+++ b/test_arena.cpp
@@ -0,0 +1,27 @@
+#include "dynarray.h"
+
+DECL_MAIN {
+    // Reserving 16GiB.
+    auto a = Arena(16ULL * 1024ULL * 1024ULL * 1024ULL);
+
+    // Committing 1MiB to make space for 4 bytes (with some headroom).
+    bool committed = a.Grow(4);
+    assert(committed);
+
+    a.base[0] = 'a';
+    a.base[1] = 'b';
+    a.base[2] = 'c';
+    a.base[4] = '\0';
+
+    std::cout << a.base << std::endl;
+
+    // Past the declared length, but still in committed memory.
+    // No segfault, but in real code it's probably a bug.
+    a.base[5] = 'x';
+    a.base[kBytesPerCommit-1] = 'y';
+
+    // Reserved, but not committed memory. Segfault.
+    // a.base[kBytesPerCommit] = 'x';
+
+    return 0;
+}