diff --git a/src/lib/typesense-client.test.ts b/src/lib/typesense-client.test.ts
index c4d79cd..e4ac26f 100644
--- a/src/lib/typesense-client.test.ts
+++ b/src/lib/typesense-client.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { GetInvTypes, GetInvTypesByGroupId, SearchInvTypes } from './typesense-client';
+import { GetInvGroups, GetInvTypes, GetInvTypesByGroupId, SearchInvTypes } from './typesense-client';
 import { resourceLimits } from 'worker_threads';
 
 describe('Typesense Client InvTypes', () => {
@@ -100,4 +100,62 @@ describe('Typesense Client GetInvTypesByGroupId', () => {
     expect(results.length).toBe(32);
     expect(fetchSpy).toHaveBeenCalledTimes(1);
   });
+});
+
+describe('Typesense Client GetInvGroups', () => {
+  let fetchSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    fetchSpy = vi.spyOn(globalThis, 'fetch');
+  });
+
+  afterEach(() => {
+    fetchSpy.mockRestore();
+  });
+
+  it('get groups by group id', async () => {
+    const results = await GetInvGroups([766]);
+    expect(results.size).toBe(1);
+    expect(results.get(766)).toBeDefined();
+    expect(fetchSpy).toHaveBeenCalledTimes(1);
+  });
+
+  it('get multiple groups by group id', async () => {
+    GetInvGroups([766]); // Cache one group
+    const groupIds = [766, 767, 768];
+    const results = await GetInvGroups(groupIds);
+    expect(results.size).toBe(groupIds.length);
+    groupIds.forEach(groupId => {
+      expect(results.get(groupId)).toBeDefined();
+    });
+    expect(fetchSpy).toHaveBeenCalledTimes(1);
+  });
+
+  it('returns null for missing group ids', async () => {
+    // Assuming 999999 is not a valid group id
+    const groupIds = [766, 999999];
+    const results = await GetInvGroups(groupIds);
+    expect(results.size).toBe(1); // 1 does exist the other not
+    expect(results.get(766)).toBeDefined();
+    expect(results.get(999999)).toBeUndefined();
+    expect(fetchSpy).toHaveBeenCalledTimes(1);
+  });
+
+  it('uses cache for already fetched group ids', async () => {
+    // First fetch populates the cache
+    await GetInvGroups([766]);
+    fetchSpy.mockClear();
+
+    // Second fetch should hit the cache and not re-fetch
+    const results = await GetInvGroups([766]);
+    expect(results.size).toBe(1);
+    expect(results.get(766)).toBeDefined();
+    expect(fetchSpy).not.toHaveBeenCalled();
+  });
+
+  it('handles empty input', async () => {
+    const results = await GetInvGroups([]);
+    expect(results.size).toBe(0);
+    expect(fetchSpy).not.toHaveBeenCalled();
+  });
 });
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