diff --git a/test/unittests/bytecode_test.cpp b/test/unittests/bytecode_test.cpp
index deb55776a5..0c41a3754d 100644
--- a/test/unittests/bytecode_test.cpp
+++ b/test/unittests/bytecode_test.cpp
@@ -26,6 +26,26 @@ TEST(bytecode, push_int)
     EXPECT_EQ(push(0xffffffffffffffff), "67ffffffffffffffff");
 }
 
+TEST(bytecode, push_explicit_opcode)
+{
+    EXPECT_THROW(push(OP_JUMPDEST, {}), std::invalid_argument);
+    EXPECT_THROW(push(OP_DUP1, {}), std::invalid_argument);
+
+    EXPECT_THROW(push(OP_PUSH1, "0000"), std::invalid_argument);
+
+    EXPECT_EQ(push(OP_PUSH1, {}), "6000");
+    EXPECT_EQ(push(OP_PUSH1, "ff"), "60ff");
+    EXPECT_EQ(push(OP_PUSH2, ""), "610000");
+    EXPECT_EQ(push(OP_PUSH2, "01"), "610001");
+    EXPECT_EQ(push(OP_PUSH2, "8001"), "618001");
+    EXPECT_EQ(
+        push(OP_PUSH32, ""), "7f0000000000000000000000000000000000000000000000000000000000000000");
+    EXPECT_EQ(push(OP_PUSH32, "ab"),
+        "7f00000000000000000000000000000000000000000000000000000000000000ab");
+    EXPECT_EQ(push(OP_PUSH32, "fe000000000000000000000000000000000000000000000000000000000000ef"),
+        "7ffe000000000000000000000000000000000000000000000000000000000000ef");
+}
+
 TEST(bytecode, add)
 {
     auto e = "6007600d0160005260206000f3";
diff --git a/test/unittests/evm_test.cpp b/test/unittests/evm_test.cpp
index 0939b9aaf1..6bd0946dfc 100644
--- a/test/unittests/evm_test.cpp
+++ b/test/unittests/evm_test.cpp
@@ -140,7 +140,7 @@ TEST_P(evm, swapsn_push)
     // EIP-663 variants B and C.
     // When SWAPSN is implemented execution will succeed, considering PUSH an argument of SWAPSN.
     const auto swapsn = "b3";
-    const auto code = push(5) + OP_JUMP + swapsn + push(OP_JUMPDEST) + push(0) + ret_top();
+    const auto code = push(5) + OP_JUMP + swapsn + push(uint8_t{OP_JUMPDEST}) + push(0) + ret_top();
 
     rev = EVMC_PETERSBURG;
     execute(code);
diff --git a/test/utils/bytecode.hpp b/test/utils/bytecode.hpp
index 4765d7c1af..ed3c2fb315 100644
--- a/test/utils/bytecode.hpp
+++ b/test/utils/bytecode.hpp
@@ -6,6 +6,7 @@
 #include <evmc/instructions.h>
 #include <test/utils/utils.hpp>
 #include <algorithm>
+#include <ostream>
 #include <stdexcept>
 
 struct bytecode;
@@ -76,6 +77,20 @@ inline bytecode push(std::string_view hex_data)
     return push(from_hex(hex_data));
 }
 
+bytecode push(evmc_opcode opcode) = delete;
+
+inline bytecode push(evmc_opcode opcode, const bytecode& data)
+{
+    if (opcode < OP_PUSH1 || opcode > OP_PUSH32)
+        throw std::invalid_argument{"invalid push opcode " + std::to_string(opcode)};
+
+    const auto num_instr_bytes = static_cast<size_t>(opcode) - OP_PUSH1 + 1;
+    if (data.size() > num_instr_bytes)
+        throw std::invalid_argument{"push data too long"};
+
+    const auto instr_bytes = bytes(num_instr_bytes - data.size(), 0) + bytes{data};
+    return opcode + instr_bytes;
+}
 
 inline bytecode push(uint64_t n)
 {