Disabled alignment on AVR (fixes #1231)

extras/tests/MixedConfiguration/enable_alignment_1.cpp

@@ -0,0 +1,40 @@
+#define ARDUINOJSON_ENABLE_ALIGNMENT 1
+#include <ArduinoJson.h>
+
+#include <catch.hpp>
+
+TEST_CASE("ARDUINOJSON_ENABLE_ALIGNMENT == 1") {
+  using namespace ARDUINOJSON_NAMESPACE;
+
+  const size_t N = sizeof(void*);
+
+  SECTION("isAligned()") {
+    CHECK(isAligned(0) == true);
+    CHECK(isAligned(1) == false);
+    CHECK(isAligned(N) == true);
+    CHECK(isAligned(N + 1) == false);
+    CHECK(isAligned(2 * N) == true);
+    CHECK(isAligned(2 * N + 1) == false);
+  }
+
+  SECTION("addPadding()") {
+    CHECK(addPadding(0) == 0);
+    CHECK(addPadding(1) == N);
+    CHECK(addPadding(N) == N);
+    CHECK(addPadding(N + 1) == 2 * N);
+  }
+
+  SECTION("AddPadding<>") {
+    const size_t a = AddPadding<0>::value;
+    CHECK(a == 0);
+
+    const size_t b = AddPadding<1>::value;
+    CHECK(b == N);
+
+    const size_t c = AddPadding<N>::value;
+    CHECK(c == N);
+
+    const size_t d = AddPadding<N + 1>::value;
+    CHECK(d == 2 * N);
+  }
+}