test: add failing js reset-leak test (#159)

Drives the js runtime through the shared assertResetDoesNotLeak helper.

Author: edjroz

host-go/engine/tests/wasm32_pipeline_reset_js_test.go

@@ -0,0 +1,19 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//go:build js
+
+package tests
+
+import (
+	"testing"
+
+	"github.com/sourcenetwork/lens/host-go/runtimes/js"
+)
+
+// TestJsResetDoesNotLeakMemory asserts the js runtime does not leak wasm linear
+// memory across Reset cycles (issue #159).
+func TestJsResetDoesNotLeakMemory(t *testing.T) {
+	assertResetDoesNotLeak(t, js.New())
+}