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

test/StaticMemoryPool/StringBuilder.cpp

@@ -0,0 +1,39 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson/Memory/StaticMemoryPool.hpp>
+#include <ArduinoJson/Memory/StringBuilder.hpp>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("StringBuilder") {
+  SECTION("WorksWhenBufferIsBigEnough") {
+    StaticMemoryPool<JSON_STRING_SIZE(6)> memoryPool;
+
+    StringBuilder str(&memoryPool);
+    str.append("hello");
+
+    REQUIRE(str.complete().equals("hello"));
+  }
+
+  SECTION("ReturnsNullWhenTooSmall") {
+    StaticMemoryPool<1> memoryPool;
+
+    StringBuilder str(&memoryPool);
+    str.append("hello!!!");
+
+    REQUIRE(str.complete().isNull());
+  }
+
+  SECTION("Increases size of memory pool") {
+    StaticMemoryPool<JSON_STRING_SIZE(6)> memoryPool;
+
+    StringBuilder str(&memoryPool);
+    str.append('h');
+    str.complete();
+
+    REQUIRE(JSON_STRING_SIZE(2) == memoryPool.size());
+  }
+}