diff --git a/src/bytecode/bytecode.hh b/src/bytecode/bytecode.hh
index 4946946..f3483f1 100644
--- a/src/bytecode/bytecode.hh
+++ b/src/bytecode/bytecode.hh
@@ -27,6 +27,8 @@ public:
 
     // TODO - debugging info
 
+    [[nodiscard]] std::vector<uint8_t> const& data() const { return byte_array_.data(); }
+
 private:
     ByteArray byte_array_;
     static constexpr uint8_t VERSION = 1;
diff --git a/src/bytecode/tests.cc b/src/bytecode/tests.cc
index 6dda626..4547771 100644
--- a/src/bytecode/tests.cc
+++ b/src/bytecode/tests.cc
@@ -1,9 +1,12 @@
 #include "gtest/gtest.h"
+#include "gmock/gmock.h"
 
 #include <cstring>
 #include <functional>
 
 #include "bytearray.hh"
+#include "bytecodeprototype.hh"
+#include "bytecode.hh"
 
 using namespace tyche;
 
@@ -38,6 +41,45 @@ TEST(ByteArray, ByteArray)
 #undef TESTX
 }
 
+TEST(Bytecode, Constants)
+{
+    BytecodePrototype bp;
+    bp.constants.emplace_back(42);
+    bp.constants.emplace_back("HELLO");
+
+    Bytecode bc(bp);
+    auto binary = bc.data();
+
+    ByteArray ba;
+    ba.append_int(42);
+
+    std::vector<uint8_t> expected = {
+            // header
+            0x38, 0xc1, 0xb3, 0x74,                     // magic
+            0x01, 0x00, 0x00, 0x00,                     // version
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+            // index
+            0x30, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+
+            // constant indexes
+            0x00, 0x00, 0x00, 0x00,
+            0x01, 0x00, 0x00, 0x00,
+
+            // constant values
+            0x54, 'H', 'e', 'l', 'l', 'o', 0x00
+    };
+
+    ASSERT_EQ(binary, expected);
+}
+
 int main(int argc, char** argv)
 {
     testing::InitGoogleTest(&argc, argv);