diff --git a/src/__tests__/connection_pool.test.js b/src/__tests__/connection_pool.test.js
new file mode 100644
index 0000000..01b1dbd
--- /dev/null
+++ b/src/__tests__/connection_pool.test.js
@@ -0,0 +1,43 @@
+import connection_pool from '../networking/connection_pool';
+import packet from '../networking/packet';
+import connection from '../networking/connection';
+
+jest.mock('../networking/connection');
+
+test(`construction fails if pool size is <= 1`, () => {
+  expect(() => new connection_pool(1)).toThrow(Error);
+  expect(() => new connection_pool(0)).toThrow(Error);
+  expect(() => new connection_pool(-1)).toThrow(Error);
+});
+
+test(`error on socket release is ignored`, async () => {
+
+  const conn = new connection_pool(2, '', 20000);
+  let invoked = false;
+  jest.spyOn(conn.pool, 'acquire').mockImplementation(() => {
+    return {
+      release: () => {
+        invoked = true;
+        throw new Error('mock release error');
+      },
+    }
+  });
+
+  const mock_send = jest.fn();
+  connection.prototype.send = async () => {
+    return mock_send();
+  };
+  mock_send.mockResolvedValue(0);
+
+  expect(await conn.send('', new packet())).toEqual(0);
+  expect(invoked).toBeTruthy();
+});
+
+test(`send fails if acquire fails`, async () => {
+  const conn = new connection_pool(2, '', 20000);
+  jest.spyOn(conn.pool, 'acquire').mockImplementation(() => {
+    throw new Error('mock acquire exception');
+  });
+
+  await expect(conn.send('', new packet())).rejects.toThrow(Error);
+});