diff --git a/frontends/nextjs/src/lib/lua/functions/sandbox/enforce-max-memory.test.ts b/frontends/nextjs/src/lib/lua/functions/sandbox/enforce-max-memory.test.ts
new file mode 100644
index 000000000..b2bdaa31d
--- /dev/null
+++ b/frontends/nextjs/src/lib/lua/functions/sandbox/enforce-max-memory.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest'
+import type { SandboxedLuaEngineState } from './types'
+import { enforceMaxMemory } from './enforce-max-memory'
+
+const createState = (usageBytes: number, maxMemory: number): SandboxedLuaEngineState =>
+  ({
+    maxMemory,
+    getLuaMemoryUsageBytes: () => usageBytes,
+  }) as SandboxedLuaEngineState
+
+describe('enforceMaxMemory', () => {
+  it('does not throw when usage is under the limit', () => {
+    const state = createState(512, 1024)
+    expect(() => enforceMaxMemory.call(state)).not.toThrow()
+  })
+
+  it('throws when usage exceeds the limit', () => {
+    const state = createState(2048, 1024)
+    expect(() => enforceMaxMemory.call(state)).toThrow(/Memory limit exceeded/)
+  })
+
+  it('does not throw when maxMemory is disabled', () => {
+    const state = createState(2048, 0)
+    expect(() => enforceMaxMemory.call(state)).not.toThrow()
+  })
+})