add wasm_test: test wasm that does not export the start function

unittests/contracts/test_wasts.hpp

@@ -143,6 +143,41 @@ static const char entry_wast[] = R"=====(
 )
 )=====";
 
+static const char entry_wast_2[] = R"=====(
+(module
+ (import "env" "require_auth" (func $require_auth (param i64)))
+ (import "env" "eosio_assert" (func $eosio_assert (param i32 i32)))
+ (import "env" "current_time" (func $current_time (result i64)))
+ (table 0 anyfunc)
+ (memory $0 1)
+ (export "memory" (memory $0))
+ (export "apply" (func $apply))
+ (start $entry)
+ (func $apply (param $0 i64) (param $1 i64) (param $2 i64)
+  (block
+   (call $require_auth (i64.const 6121376101093867520))
+   (call $eosio_assert
+    (i64.eq
+     (i64.load offset=4
+      (i32.const 0)
+     )
+     (call $current_time)
+    )
+    (i32.const 0)
+   )
+  )
+ )
+ (func $entry
+  (block
+   (i64.store offset=4
+    (i32.const 0)
+    (call $current_time)
+   )
+  )
+ )
+)
+)=====";
+
 static const char simple_no_memory_wast[] = R"=====(
 (module
  (import "env" "require_auth" (func $require_auth (param i64)))

unittests/wasm_tests.cpp

@@ -670,6 +670,31 @@ BOOST_FIXTURE_TEST_CASE( check_entry_behavior, TESTER ) try {
    BOOST_CHECK_EQUAL(transaction_receipt::executed, receipt.status);
 } FC_LOG_AND_RETHROW()
 
+BOOST_FIXTURE_TEST_CASE( check_entry_behavior_2, TESTER ) try {
+   produce_blocks(2);
+   create_accounts( {N(entrycheck)} );
+   produce_block();
+
+   set_code(N(entrycheck), entry_wast_2);
+   produce_blocks(10);
+
+   signed_transaction trx;
+   action act;
+   act.account = N(entrycheck);
+   act.name = N();
+   act.authorization = vector<permission_level>{{N(entrycheck),config::active_name}};
+   trx.actions.push_back(act);
+
+   set_transaction_headers(trx);
+   trx.sign(get_private_key( N(entrycheck), "active" ), chain_id_type());
+   push_transaction(trx);
+   produce_blocks(1);
+   BOOST_REQUIRE_EQUAL(true, chain_has_transaction(trx.id()));
+   const auto& receipt = get_transaction_receipt(trx.id());
+   BOOST_CHECK_EQUAL(transaction_receipt::executed, receipt.status);
+} FC_LOG_AND_RETHROW()
+
+
 /**
  * Ensure we can load a wasm w/o memory
  */