diff --git a/lib/runtime/wasmer/helpers_test.go b/lib/runtime/wasmer/helpers_test.go
index 11c605ff1b..47ddf8cee5 100644
--- a/lib/runtime/wasmer/helpers_test.go
+++ b/lib/runtime/wasmer/helpers_test.go
@@ -5,11 +5,13 @@ package wasmer
 
 import (
 	"encoding/json"
+	"errors"
 	"os"
 	"path/filepath"
 	"testing"
 
 	"github.com/ChainSafe/gossamer/lib/genesis"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -27,3 +29,51 @@ func genesisFromRawJSON(t *testing.T, jsonFilepath string) (gen genesis.Genesis)
 
 	return gen
 }
+
+func Test_pointerSize(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		ptr         uint32
+		size        uint32
+		pointerSize int64
+	}{
+		"0": {},
+		"ptr_8_size_32": {
+			ptr:         8,
+			size:        32,
+			pointerSize: int64(8) | (int64(32) << 32),
+		},
+		"ptr_max_uint32_and_size_max_uint32": {
+			ptr:         ^uint32(0),
+			size:        ^uint32(0),
+			pointerSize: ^int64(0),
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			pointerSize := toPointerSize(testCase.ptr, testCase.size)
+
+			require.Equal(t, testCase.pointerSize, pointerSize)
+
+			ptr, size := splitPointerSize(pointerSize)
+
+			assert.Equal(t, testCase.ptr, ptr)
+			assert.Equal(t, testCase.size, size)
+		})
+	}
+}
+
+func Test_panicOnError(t *testing.T) {
+	t.Parallel()
+
+	err := (error)(nil)
+	assert.NotPanics(t, func() { panicOnError(err) })
+
+	err = errors.New("test error")
+	assert.PanicsWithValue(t, err, func() { panicOnError(err) })
+}