diff --git a/test/lock-ops.test.mjs b/test/lock-ops.test.mjs
new file mode 100644
index 0000000..699798f
--- /dev/null
+++ b/test/lock-ops.test.mjs
@@ -0,0 +1,121 @@
+import { test, describe, it } from 'node:test';
+import assert from 'node:assert';
+import { parseLockEvent } from '../src/lib.mjs';
+
+describe('parseLockEvent', () => {
+  it('should parse a valid lock event correctly', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400, // 2023-03-15T13:20:00.000Z
+      tags: [
+        ['d', 'mock-d-tag'],
+        ['expiration', '1678890000'], // 2023-03-15T14:20:00.000Z
+      ],
+      content: JSON.stringify({
+        agent: 'test-agent',
+        cadence: 'daily',
+        status: 'started',
+        namespace: 'test-ns',
+        date: '2023-03-15',
+        platform: 'test-platform',
+      }),
+    };
+
+    const result = parseLockEvent(event);
+
+    assert.strictEqual(result.eventId, 'mock-event-id');
+    assert.strictEqual(result.pubkey, 'mock-pubkey');
+    assert.strictEqual(result.createdAt, 1678886400);
+    assert.strictEqual(result.createdAtIso, '2023-03-15T13:20:00.000Z');
+    assert.strictEqual(result.expiresAt, 1678890000);
+    assert.strictEqual(result.expiresAtIso, '2023-03-15T14:20:00.000Z');
+    assert.strictEqual(result.dTag, 'mock-d-tag');
+    assert.strictEqual(result.agent, 'test-agent');
+    assert.strictEqual(result.cadence, 'daily');
+    assert.strictEqual(result.status, 'started');
+    assert.strictEqual(result.date, '2023-03-15');
+    assert.strictEqual(result.platform, 'test-platform');
+  });
+
+  it('should handle missing d tag', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [],
+      content: '{}',
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.dTag, '');
+  });
+
+  it('should handle missing expiration tag', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [['d', 'mock-d-tag']],
+      content: '{}',
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.expiresAt, null);
+    assert.strictEqual(result.expiresAtIso, null);
+  });
+
+  it('should handle malformed JSON content', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [],
+      content: '{ invalid json }',
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.agent, null);
+    assert.strictEqual(result.cadence, null);
+  });
+
+  it('should handle non-object JSON content (string)', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [],
+      content: '"just a string"',
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.agent, null);
+  });
+
+  it('should handle non-object JSON content (array)', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [],
+      content: '["item1", "item2"]',
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.agent, null);
+  });
+
+  it('should handle partial JSON content', () => {
+    const event = {
+      id: 'mock-event-id',
+      pubkey: 'mock-pubkey',
+      created_at: 1678886400,
+      tags: [],
+      content: JSON.stringify({ agent: 'partial-agent' }),
+    };
+
+    const result = parseLockEvent(event);
+    assert.strictEqual(result.agent, 'partial-agent');
+    assert.strictEqual(result.cadence, null);
+  });
+});