feat(wasmer): Add SetTestVersion method to Config struct (#2823)

lib/runtime/wasmer/config.go

@@ -4,6 +4,8 @@
 package wasmer
 
 import (
+	"testing"
+
 	"github.com/ChainSafe/gossamer/internal/log"
 	"github.com/ChainSafe/gossamer/lib/common"
 	"github.com/ChainSafe/gossamer/lib/keystore"
@@ -23,3 +25,14 @@ type Config struct {
 	CodeHash    common.Hash
 	testVersion *runtime.Version
 }
+
+// SetTestVersion sets the test version for the runtime.
+// WARNING: This should only be used for testing purposes.
+// The *testing.T argument is only required to enforce this function
+// to be used in tests only.
+func (c *Config) SetTestVersion(t *testing.T, version runtime.Version) {
+	if t == nil {
+		panic("*testing.T argument cannot be nil. Please don't use this function outside of Go tests.")
+	}
+	c.testVersion = &version
+}

lib/runtime/wasmer/config_test.go

@@ -0,0 +1,35 @@
+// Copyright 2022 ChainSafe Systems (ON)
+// SPDX-License-Identifier: LGPL-3.0-only
+
+package wasmer
+
+import (
+	"testing"
+
+	"github.com/ChainSafe/gossamer/lib/runtime"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Config_SetTestVersion(t *testing.T) {
+	t.Run("panics with nil *testing.T", func(t *testing.T) {
+		var c Config
+		assert.PanicsWithValue(t,
+			"*testing.T argument cannot be nil. Please don't use this function outside of Go tests.",
+			func() {
+				c.SetTestVersion(nil, runtime.Version{})
+			})
+	})
+
+	t.Run("set test version", func(t *testing.T) {
+		var c Config
+		testVersion := runtime.Version{
+			StateVersion: 1,
+		}
+
+		c.SetTestVersion(t, testVersion)
+
+		require.NotNil(t, c.testVersion)
+		assert.Equal(t, testVersion, *c.testVersion)
+	})
+}