diff --git a/__tests__/fileListFilter.spec.ts b/__tests__/fileListFilter.spec.ts
new file mode 100644
index 00000000..6e08263f
--- /dev/null
+++ b/__tests__/fileListFilter.spec.ts
@@ -0,0 +1,146 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+import { beforeEach, describe, expect, test, vi } from 'vitest'
+import { FileListFilter, getFileListFilters, IFileListFilterChip, registerFileListFilter, unregisterFileListFilter } from '../lib'
+import { subscribe } from '@nextcloud/event-bus'
+
+class TestFilter extends FileListFilter {
+
+	public testUpdated() {
+		this.filterUpdated()
+	}
+
+	public testUpdateChips(chips) {
+		this.updateChips(chips)
+	}
+
+}
+
+describe('File list filter class', () => {
+	test('correctly sets ID', () => {
+		const filter = new FileListFilter('my:id')
+		expect(filter.id).toBe('my:id')
+	})
+
+	test('has fallback order', () => {
+		const filter = new FileListFilter('my:id')
+		expect(filter.order).toBe(100)
+	})
+
+	test('can set order', () => {
+		const filter = new FileListFilter('my:id', 50)
+		expect(filter.order).toBe(50)
+	})
+
+	test('emits filter updated event', () => {
+		const filter = new TestFilter('my:id', 50)
+		const spy = vi.fn()
+
+		filter.addEventListener('update:filter', spy)
+		filter.testUpdated()
+
+		expect(spy).toBeCalled()
+		expect(spy.mock.calls[0][0]).toBeInstanceOf(CustomEvent)
+		expect(spy.mock.calls[0][0].type).toBe('update:filter')
+	})
+
+	test('emits chips updated event', () => {
+		const filter = new TestFilter('my:id', 50)
+		const chips: IFileListFilterChip[] = [{ text: 'my chip', onclick: () => {} }]
+		const spy = vi.fn()
+
+		filter.addEventListener('update:chips', spy)
+		filter.testUpdateChips(chips)
+
+		expect(spy).toBeCalled()
+		expect(spy.mock.calls[0][0]).toBeInstanceOf(CustomEvent)
+		expect(spy.mock.calls[0][0].type).toBe('update:chips')
+		expect(spy.mock.calls[0][0].detail).toBe(chips)
+	})
+
+	test('requires filter function to be implemented', () => {
+		const filter = new TestFilter('my:id')
+		expect(() => filter.filter([])).toThrowError()
+	})
+})
+
+describe('File list filter functions', () => {
+	beforeEach(() => {
+		delete window._nc_filelist_filters
+	})
+
+	test('can register a filter', () => {
+		const filter = new FileListFilter('my:id', 50)
+
+		registerFileListFilter(filter)
+		expect(window._nc_filelist_filters).toBeTypeOf('object')
+		expect(window._nc_filelist_filters!.has(filter.id)).toBe(true)
+		expect(window._nc_filelist_filters!.get(filter.id)).toBe(filter)
+	})
+
+	test('register a filter emits event', () => {
+		const filter = new FileListFilter('my:id')
+		const spy = vi.fn()
+
+		subscribe('files:filter:added', spy)
+
+		expect(window._nc_filelist_filters).toBe(undefined)
+
+		registerFileListFilter(filter)
+		expect(spy).toHaveBeenCalled()
+		expect(spy).toHaveBeenCalledWith(filter)
+	})
+
+	test('cannot register a filter twice', () => {
+		const filter = new FileListFilter('my:id')
+		const filter2 = new FileListFilter('my:id')
+
+		registerFileListFilter(filter)
+		expect(() => registerFileListFilter(filter2)).toThrowError(/already registered/)
+	})
+
+	test('can unregister a filter', () => {
+		const filter = new FileListFilter('my:id')
+
+		registerFileListFilter(filter)
+		expect(window._nc_filelist_filters!.has(filter.id)).toBe(true)
+
+		// test
+		unregisterFileListFilter(filter.id)
+		expect(window._nc_filelist_filters!.has(filter.id)).toBe(false)
+	})
+
+	test('unregister a filter twice does not throw', () => {
+		const filter = new FileListFilter('my:id')
+
+		registerFileListFilter(filter)
+		expect(window._nc_filelist_filters!.has(filter.id)).toBe(true)
+
+		// test
+		unregisterFileListFilter(filter.id)
+		expect(window._nc_filelist_filters!.has(filter.id)).toBe(false)
+		expect(() => unregisterFileListFilter(filter.id)).not.toThrow()
+	})
+
+	test('unregister a filter emits event', () => {
+		const filter = new FileListFilter('my:id')
+		const spy = vi.fn()
+
+		registerFileListFilter(filter)
+		subscribe('files:filter:removed', spy)
+
+		unregisterFileListFilter(filter.id)
+		expect(spy).toHaveBeenCalled()
+		expect(spy).toHaveBeenCalledWith(filter.id)
+	})
+
+	test('can get registered filters', () => {
+		const filter = new FileListFilter('my:id', 50)
+
+		expect(getFileListFilters()).toEqual([])
+		registerFileListFilter(filter)
+		expect(getFileListFilters()).toEqual([filter])
+	})
+})
diff --git a/__tests__/tsconfig.json b/__tests__/tsconfig.json
index 07f30a9d..64758222 100644
--- a/__tests__/tsconfig.json
+++ b/__tests__/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "extends": "../tsconfig.json",
-  "include": ["../lib/**/*.ts", "./**/*.ts"],
+  "include": ["../lib/**/*.ts", "./**/*.ts", "../window.d.ts"],
   "compilerOptions": {
   // Allow us to pass js files to ts-jest without babel
     "allowJs": true,