Add tests.

Signed-off-by: John Plevyak <[email protected]>

Author: jplevyak

include/proxy-wasm/word.h

@@ -24,6 +24,7 @@ namespace proxy_wasm {
 struct Word {
   Word(uint64_t w) : u64_(w) {} // Implicit conversion into Word.
   uint32_t u32() const { return static_cast<uint32_t>(u64_); }
+  operator uint64_t() const { return u64_; }
   uint64_t u64_;
 };
 

wasm_vm_test.cc

@@ -5,12 +5,26 @@
 namespace proxy_wasm {
 namespace {
 
-TEST(WasmVm, Load) {
+TEST(WasmVm, Compat) {
   string_view foo = "foo";
   std::string bar = "bar";
 
   EXPECT_NE(foo, bar);
   EXPECT_EQ(foo, "foo");
+
+  optional<int> o = PROXY_WASM_NULLOPT;
+  EXPECT_FALSE(o);
+
+  o = 1;
+  EXPECT_TRUE(o);
+}
+
+TEST(WasmVm, Word) {
+  Word w(1);
+  EXPECT_EQ(w.u32(), 1);
+  EXPECT_EQ(sizeof(w.u32()), sizeof(uint32_t));
+  EXPECT_EQ(w, 1);
+  EXPECT_EQ(sizeof(w), sizeof(uint64_t));
 }
 
 } // namespace