JsonArray::remove() and JsonObject::remove() now release the memory of strings

test/DynamicMemoryPool/StringBuilder.cpp

@@ -0,0 +1,41 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson/Memory/DynamicMemoryPool.hpp>
+#include <ArduinoJson/Memory/StringBuilder.hpp>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("DynamicMemoryPool::startString()") {
+  SECTION("WorksWhenBufferIsBigEnough") {
+    DynamicMemoryPool memoryPool(JSON_STRING_SIZE(8));
+
+    StringBuilder str(&memoryPool);
+    str.append("abcdefg");
+
+    REQUIRE(memoryPool.blockCount() == 1);
+    REQUIRE(str.complete().equals("abcdefg"));
+  }
+
+  SECTION("GrowsWhenBufferIsTooSmall") {
+    DynamicMemoryPool memoryPool(JSON_STRING_SIZE(8));
+
+    StringBuilder str(&memoryPool);
+    str.append("abcdefghABC");
+
+    REQUIRE(memoryPool.blockCount() == 2);
+    REQUIRE(str.complete().equals("abcdefghABC"));
+  }
+
+  SECTION("SizeIncreases") {
+    DynamicMemoryPool memoryPool(JSON_STRING_SIZE(5));
+
+    StringBuilder str(&memoryPool);
+    str.append('h');
+    str.complete();
+
+    REQUIRE(JSON_STRING_SIZE(2) == memoryPool.size());
+  }
+}