Improve test

Author: nordlow

source/mir/appender.d

@@ -245,6 +245,9 @@ struct ScopedBuffer(T, size_t bytes = 4096)
  }
  }
 
+ ///
+ alias opOpAssign(string op : "~") = put;
+
  ///
  void reset() scope nothrow
  {
@@ -326,6 +329,27 @@ version (mir_test) unittest
  assert(buf.data == "cs");
 }
 
+@safe pure nothrow @nogc
+version (mir_test) unittest
+{
+ alias T = char;
+ const n = 3;
+
+ auto buf = scopedBuffer!(T, n * T.sizeof);
+ assert(buf._scopeBuffer.length == n); // stack
+ assert(buf._buffer.length == 0); // unset
+
+ buf.reserve(n + 1); // transition to heap
+ assert(buf._buffer.length >= n + 1); // heap
+
+ buf ~= 'c';
+ buf ~= "str";
+ assert(buf.data == "cstr");
+
+ buf.popBackN(2);
+ assert(buf.data == "cs");
+}
+
 ///
 struct UnsafeArrayBuffer(T)
 {