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

test/DynamicMemoryPool/clear.cpp

@@ -0,0 +1,47 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson/Memory/DynamicMemoryPool.hpp>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("StaticMemoryPool::clear()") {
+  DynamicMemoryPool memoryPool;
+
+  SECTION("Discards allocated variants") {
+    memoryPool.allocVariant();
+    REQUIRE(memoryPool.size() > 0);
+
+    memoryPool.clear();
+    CHECK(memoryPool.size() == 0);
+  }
+
+  SECTION("Discards allocated strings") {
+    memoryPool.allocFrozenString(10);
+    REQUIRE(memoryPool.size() > 0);
+
+    memoryPool.clear();
+
+    CHECK(memoryPool.size() == 0);
+  }
+
+  SECTION("Purges variant cache") {
+    memoryPool.freeVariant(memoryPool.allocVariant());
+    REQUIRE(memoryPool.size() == 0);
+
+    memoryPool.clear();
+
+    CHECK(memoryPool.size() == 0);
+  }
+
+  SECTION("Purges string cache") {
+    memoryPool.freeString(memoryPool.allocFrozenString(10));
+    // REQUIRE(memoryPool.size() == 0);
+
+    memoryPool.clear();
+
+    CHECK(memoryPool.size() == 0);
+  }
+}