Renamed JsonBuffer to MemoryPool

test/DynamicMemoryPool/alloc.cpp

@@ -0,0 +1,77 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+#include <sstream>
+
+using namespace ArduinoJson::Internals;
+
+static bool isAligned(void* ptr) {
+  const size_t mask = sizeof(void*) - 1;
+  size_t addr = reinterpret_cast<size_t>(ptr);
+  return (addr & mask) == 0;
+}
+
+std::stringstream allocatorLog;
+
+struct SpyingAllocator : DefaultAllocator {
+  void* allocate(size_t n) {
+    allocatorLog << "A" << (n - DynamicMemoryPool::EmptyBlockSize);
+    return DefaultAllocator::allocate(n);
+  }
+  void deallocate(void* p) {
+    allocatorLog << "F";
+    return DefaultAllocator::deallocate(p);
+  }
+};
+
+TEST_CASE("DynamicMemoryPool::alloc()") {
+  SECTION("Returns different pointers") {
+    DynamicMemoryPool memoryPool;
+    void* p1 = memoryPool.alloc(1);
+    void* p2 = memoryPool.alloc(2);
+    REQUIRE(p1 != p2);
+  }
+
+  SECTION("Doubles allocation size when full") {
+    allocatorLog.str("");
+    {
+      DynamicMemoryPoolBase<SpyingAllocator> memoryPool(1);
+      memoryPool.alloc(1);
+      memoryPool.alloc(1);
+    }
+    REQUIRE(allocatorLog.str() == "A1A2FF");
+  }
+
+  SECTION("Resets allocation size after clear()") {
+    allocatorLog.str("");
+    {
+      DynamicMemoryPoolBase<SpyingAllocator> memoryPool(1);
+      memoryPool.alloc(1);
+      memoryPool.alloc(1);
+      memoryPool.clear();
+      memoryPool.alloc(1);
+    }
+    REQUIRE(allocatorLog.str() == "A1A2FFA1F");
+  }
+
+  SECTION("Makes a big allocation when needed") {
+    allocatorLog.str("");
+    {
+      DynamicMemoryPoolBase<SpyingAllocator> memoryPool(1);
+      memoryPool.alloc(42);
+    }
+    REQUIRE(allocatorLog.str() == "A42F");
+  }
+
+  SECTION("Alignment") {
+    // make room for two but not three
+    DynamicMemoryPool tinyBuf(2 * sizeof(void*) + 1);
+
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this on is aligned by design
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this one fits in the first block
+    REQUIRE(isAligned(tinyBuf.alloc(1)));  // this one requires a new block
+  }
+}