diff --git a/code/websites/pokedex.online/tests/unit/components/challonge/ApiVersionSelector.test.js b/code/websites/pokedex.online/tests/unit/components/challonge/ApiVersionSelector.test.js
new file mode 100644
index 0000000..9567703
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+++ b/code/websites/pokedex.online/tests/unit/components/challonge/ApiVersionSelector.test.js
@@ -0,0 +1,131 @@
+/**
+ * ApiVersionSelector Component Tests
+ */
+
+import { describe, it, expect } from 'vitest';
+import { mount } from '@vue/test-utils';
+import ApiVersionSelector from '../../../../src/components/challonge/ApiVersionSelector.vue';
+
+describe('ApiVersionSelector', () => {
+  it('renders with default v2.1 selected', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1' }
+    });
+
+    expect(wrapper.find('input[value="v2.1"]').element.checked).toBe(true);
+    expect(wrapper.text()).toContain('Using API v2.1');
+  });
+
+  it('renders with v1 selected', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v1' }
+    });
+
+    expect(wrapper.find('input[value="v1"]').element.checked).toBe(true);
+    expect(wrapper.text()).toContain('Using API v1');
+  });
+
+  it('emits update:modelValue when version changes', async () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1' }
+    });
+
+    const v1Radio = wrapper.findAll('input[type="radio"]')[0];
+    await v1Radio.setValue(true);
+
+    expect(wrapper.emitted('update:modelValue')).toBeTruthy();
+    expect(wrapper.emitted('update:modelValue')[0]).toEqual(['v1']);
+  });
+
+  it('shows per-page selector for v2.1', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', showPerPage: true }
+    });
+
+    expect(wrapper.text()).toContain('Results per page');
+    expect(wrapper.find('.select-input').exists()).toBe(true);
+  });
+
+  it('hides per-page selector for v1', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v1', showPerPage: true }
+    });
+
+    expect(wrapper.text()).not.toContain('Results per page');
+  });
+
+  it('shows scope selector for v2.1', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', showScope: true }
+    });
+
+    expect(wrapper.text()).toContain('Tournament scope');
+  });
+
+  it('hides scope selector for v1', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v1', showScope: true }
+    });
+
+    expect(wrapper.text()).not.toContain('Tournament scope');
+  });
+
+  it('emits update:perPage when per-page changes', async () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', perPage: 100, showPerPage: true }
+    });
+
+    const select = wrapper.findAll('select')[0];
+    await select.setValue('25');
+
+    expect(wrapper.emitted('update:perPage')).toBeTruthy();
+    expect(wrapper.emitted('update:perPage')[0]).toEqual([25]);
+  });
+
+  it('emits update:scope when scope changes', async () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', scope: 'user', showScope: true }
+    });
+
+    const select = wrapper.findAll('select')[1];
+    await select.setValue('app');
+
+    expect(wrapper.emitted('update:scope')).toBeTruthy();
+    expect(wrapper.emitted('update:scope')[0]).toEqual(['app']);
+  });
+
+  it('shows USER scope info badge', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', scope: 'user', showScope: true }
+    });
+
+    expect(wrapper.text()).toContain('USER scope');
+    expect(wrapper.find('.info-badge').exists()).toBe(true);
+    expect(wrapper.find('.info-badge.warning').exists()).toBe(false);
+  });
+
+  it('shows APPLICATION scope warning badge', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', scope: 'app', showScope: true }
+    });
+
+    expect(wrapper.text()).toContain('APPLICATION scope');
+    expect(wrapper.find('.info-badge.warning').exists()).toBe(true);
+  });
+
+  it('can hide per-page selector', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', showPerPage: false }
+    });
+
+    expect(wrapper.text()).not.toContain('Results per page');
+  });
+
+  it('can hide scope selector', () => {
+    const wrapper = mount(ApiVersionSelector, {
+      props: { modelValue: 'v2.1', showScope: false }
+    });
+
+    expect(wrapper.text()).not.toContain('Tournament scope');
+  });
+});