diff --git a/src/api/__tests__/mentors.ts b/src/api/__tests__/mentors.ts
new file mode 100644
index 00000000..add0a609
--- /dev/null
+++ b/src/api/__tests__/mentors.ts
@@ -0,0 +1,130 @@
+import { describe, expect, it } from '@jest/globals';
+import { Mentor, sort } from '../mentors';
+
+const mentors: Array<Mentor> = [
+  {
+    buddyId: 'abk3p_buddy_1',
+    mentorId: 'mentor_1',
+    age: 32,
+    name: 'Foo',
+    region: 'Helsinki',
+    story: 'Bar baz bang',
+    skills: ['Juggling', 'Belly dancing'],
+    languages: [],
+    is_vacationing: false,
+    status_message: 'Status message',
+    gender: 'Male',
+    communication_channels: [],
+  },
+  {
+    buddyId: 'dert_buddy_2',
+    mentorId: 'mentor_2',
+    age: 44,
+    name: 'Hello',
+    region: 'Tampere',
+    story: 'Bingo bongo',
+    skills: ['Wine tasting', 'Belly dancing'],
+    languages: [],
+    is_vacationing: false,
+    status_message: 'Status message 2',
+    gender: 'Female',
+    communication_channels: [],
+  },
+  {
+    buddyId: 'blarr_buddy_3',
+    mentorId: 'mentor_3',
+    age: 25,
+    name: 'Asd',
+    region: 'Kerava',
+    story: 'Story is story',
+    skills: ['Vim', 'Python'],
+    languages: [],
+    is_vacationing: true,
+    status_message: 'Status message 3',
+    gender: 'Male',
+    communication_channels: [],
+  },
+  {
+    buddyId: 'farg_buddy_4',
+    mentorId: 'mentor_4',
+    age: 65,
+    name: 'Ding',
+    region: 'Vantaaa',
+    story: 'Lolwut hello',
+    skills: ['Soccer'],
+    languages: [],
+    is_vacationing: false,
+    status_message: 'Status message 4',
+    gender: 'Male',
+    communication_channels: [],
+  },
+  {
+    buddyId: 'zing_buddy_5',
+    mentorId: 'mentor_5',
+    age: 22,
+    name: 'Zen',
+    region: 'Helsinki',
+    story: 'Zen moimoi',
+    skills: ['Meditation'],
+    languages: [],
+    is_vacationing: false,
+    status_message: 'Status message 5',
+    gender: 'Male',
+    communication_channels: [],
+  },
+  {
+    buddyId: 'whei_mentor_6',
+    mentorId: 'mentor_6',
+    age: 29,
+    name: 'Whei',
+    region: 'Rovaniemi',
+    story: 'Brrlagrgdf',
+    skills: ['Playstation'],
+    languages: [],
+    is_vacationing: true,
+    status_message: 'Status message 6',
+    gender: 'Female',
+    communication_channels: [],
+  },
+];
+
+describe('mentors sorting', () => {
+  it('if user is mentor sorts users-profile as first item', () => {
+    const sorted = sort(mentors[4].buddyId, mentors);
+
+    expect(sorted[0].buddyId).toBe(mentors[4].buddyId);
+  });
+
+  it('returns all mentors if user is not mentor', () => {
+    const sorted = sort('not_mentor', mentors);
+
+    expect(sorted.length).toBe(mentors.length);
+  });
+
+  it('sorts vacationing mentors last', () => {
+    const sorted = sort('not_mentor', mentors);
+
+    expect(sorted[sorted.length - 1].is_vacationing).toBe(true);
+    expect(sorted[0].is_vacationing).toBe(false);
+  });
+
+  it('sorts vacationing as first, if user is the mentor', () => {
+    const sorted = sort(mentors[2].buddyId, mentors);
+
+    expect(sorted[0].buddyId).toBe(mentors[2].buddyId);
+    expect(sorted[0].is_vacationing).toBe(true);
+    expect(sorted[sorted.length - 1].is_vacationing).toBe(true);
+  });
+
+  it('returns different results depending on users id', () => {
+    const sorted1 = sort('lol', mentors);
+    const sorted2 = sort('wut', mentors);
+
+    expect(sorted1[0].buddyId).not.toBe(sorted2[0].buddyId);
+  });
+
+  it('sort does not mutate original list', () => {
+    sort('not_mentor', mentors);
+    expect(JSON.stringify(mentors)).toBe(JSON.stringify(mentors));
+  });
+});