diff --git a/test/servers/helpers/index.test.ts b/test/servers/helpers/index.test.ts
new file mode 100644
index 00000000..cd1bd5cb
--- /dev/null
+++ b/test/servers/helpers/index.test.ts
@@ -0,0 +1,43 @@
+import { fromPartial } from '@total-typescript/shoehorn';
+import type { ServersMap } from '../../../src/servers/data';
+import { ensureUniqueIds } from '../../../src/servers/helpers';
+
+describe('index', () => {
+  describe('ensureUniqueIds', () => {
+    const servers: ServersMap = {
+      'the-name-example.com': fromPartial({}),
+      'another-name-example.com': fromPartial({}),
+      'short-domain-s.test': fromPartial({}),
+    };
+
+    it('returns expected list of servers when existing IDs conflict', () => {
+      const result = ensureUniqueIds(servers, [
+        fromPartial({ name: 'The name', url: 'https://example.com' }),
+        fromPartial({ name: 'Short domain', url: 'https://s.test' }),
+        fromPartial({ name: 'The name', url: 'https://example.com' }),
+      ]);
+
+      expect(result).toEqual([
+        expect.objectContaining({ id: 'the-name-example.com-1' }),
+        expect.objectContaining({ id: 'short-domain-s.test-1' }),
+        expect.objectContaining({ id: 'the-name-example.com-2' }),
+      ]);
+    });
+
+    it('returns expected list of servers when IDs conflict in provided list of servers', () => {
+      const result = ensureUniqueIds(servers, [
+        fromPartial({ name: 'Foo', url: 'https://example.com' }),
+        fromPartial({ name: 'Bar', url: 'https://s.test' }),
+        fromPartial({ name: 'Foo', url: 'https://example.com' }),
+        fromPartial({ name: 'Baz', url: 'https://s.test' }),
+      ]);
+
+      expect(result).toEqual([
+        expect.objectContaining({ id: 'foo-example.com' }),
+        expect.objectContaining({ id: 'bar-s.test' }),
+        expect.objectContaining({ id: 'foo-example.com-1' }),
+        expect.objectContaining({ id: 'baz-s.test' }),
+      ]);
+    });
+  });
+});