Add test file.

Author: brendandahl

test/embind/test_bigint.cpp

@@ -0,0 +1,23 @@
+#include <cstdint>
+#include <emscripten.h>
+#include <emscripten/bind.h>
+
+int64_t getBigInt() {
+  return 1000000000000;
+}
+
+uint64_t getBigUInt() {
+  return -1000000000000;
+}
+
+int main() {
+  EM_ASM(
+    console.log(Module.getBigInt());
+    console.log(Module.getBigUInt());
+  );
+}
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  emscripten::function("getBigInt", &getBigInt);
+  emscripten::function("getBigUInt", &getBigUInt);
+}