add arduino json lib

#182

lib/ArduinoJson/test/StaticJsonBuffer/alloc.cpp

@@ -0,0 +1,52 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+static bool isAligned(void *ptr) {
+  const size_t mask = sizeof(void *) - 1;
+  size_t addr = reinterpret_cast<size_t>(ptr);
+  return (addr & mask) == 0;
+}
+
+TEST_CASE("StaticJsonBuffer::alloc()") {
+  StaticJsonBuffer<64> buffer;
+
+  SECTION("Returns different addresses") {
+    void *p1 = buffer.alloc(1);
+    void *p2 = buffer.alloc(1);
+    REQUIRE(p1 != p2);
+  }
+
+  SECTION("Returns non-NULL when using full capacity") {
+    void *p = buffer.alloc(64);
+    REQUIRE(0 != p);
+  }
+
+  SECTION("Returns NULL when full") {
+    buffer.alloc(64);
+    void *p = buffer.alloc(1);
+    REQUIRE(0 == p);
+  }
+
+  SECTION("Returns NULL when buffer is too small") {
+    void *p = buffer.alloc(65);
+    REQUIRE(0 == p);
+  }
+
+  SECTION("Returns aligned pointers") {
+    for (size_t size = 1; size <= sizeof(void *); size++) {
+      void *p = buffer.alloc(1);
+      REQUIRE(isAligned(p));
+    }
+  }
+
+  SECTION("Returns same address after clear()") {
+    void *p1 = buffer.alloc(1);
+    buffer.clear();
+    void *p2 = buffer.alloc(1);
+    REQUIRE(p1 == p2);
+  }
+}